10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2018

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROMTO

Commission File No. 001-37917

Mammoth Energy Services, Inc.

(Exact name of registrant as specified in its charter)

Delaware	32-0498321
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
14201 Caliber Drive Suite 300 Oklahoma City, Oklahoma	73134
(Address of principal executive offices)	(Zip Code)

(405) 608-6007

(Registrant’s telephone number, including area code)

______________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, accelerated filer, non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	o	Accelerated filer	ý
Non-accelerated filer	o	Smaller reporting company	o
		Emerging growth company	ý

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ý

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

As of August 3, 2018, there were 44,755,678 shares of common stock, $0.01 par value, outstanding.

MAMMOTH ENERGY SERVICES, INC.

TABLE OF CONTENTS

		Page
	Glossary of Oil and Natural Gas and Electrical Infrastructure Terms	i
	Cautionary Note Regarding Forward-Looking Statements	iv
PART I. FINANCIAL INFORMATION		1
Item 1.	Condensed Consolidated Financial Statements (Unaudited)	1
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Comprehensive Income (Loss)	2
	Condensed Consolidated Statements of Changes in Equity	3
	Condensed Consolidated Statements of Cash Flows	4
	Notes to Unaudited Condensed Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	52
Item 4.	Controls and Procedures	54
PART II. OTHER INFORMATION		55
Item 1.	Legal Proceedings	55
Item 1A.	Risk Factors	55
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	55
Item 4.	Mine Safety Disclosures	55
Item 5.	Other Information	55
Item 6.	Exhibits	56
SIGNATURES		57

GLOSSARY OF OIL AND NATURAL GAS AND ELECTRICAL INFRASTRUCTURE TERMS

The following is a glossary of certain oil and natural gas industry terms used in this report:
Acidizing	To pump acid into a wellbore to improve a well's productivity or injectivity.
Blowout	An uncontrolled flow of reservoir fluids into the wellbore, and sometimes catastrophically to the surface. A blowout may consist of salt water, oil, natural gas or a mixture of these. Blowouts can occur in all types of exploration and production operations, not just during drilling operations. If reservoir fluids flow into another formation and do not flow to the surface, the result is called an underground blowout. If the well experiencing a blowout has significant open-hole intervals, it is possible that the well will bridge over (or seal itself with rock fragments from collapsing formations) down-hole and intervention efforts will be averted.
Bottomhole assembly	The lower portion of the drillstring, consisting of (from the bottom up in a vertical well) the bit, bit sub, a mud motor (in certain cases), stabilizers, drill collar, heavy-weight drillpipe, jarring devices (“jars”) and crossovers for various threadforms. The bottomhole assembly must provide force for the bit to break the rock (weight on bit), survive a hostile mechanical environment and provide the driller with directional control of the well. Oftentimes the assembly includes a mud motor, directional drilling and measuring equipment, measurements-while-drilling tools, logging-while-drilling tools and other specialized devices.
Cementing	To prepare and pump cement into place in a wellbore.
Coiled tubing	A long, continuous length of pipe wound on a spool. The pipe is straightened prior to pushing into a wellbore and rewound to coil the pipe back onto the transport and storage spool. Depending on the pipe diameter (1 in. to 4 1/2 in.) and the spool size, coiled tubing can range from 2,000 ft. to 23,000 ft. (610 m to 6,096 m) or greater length.
Completion	A generic term used to describe the assembly of down-hole tubulars and equipment required to enable safe and efficient production from an oil or gas well. The point at which the completion process begins may depend on the type and design of the well.
Directional drilling	The intentional deviation of a wellbore from the path it would naturally take. This is accomplished through the use of whipstocks, bottomhole assembly (BHA) configurations, instruments to measure the path of the wellbore in three-dimensional space, data links to communicate measurements taken down-hole to the surface, mud motors and special BHA components and drill bits, including rotary steerable systems, and drill bits. The directional driller also exploits drilling parameters such as weight on bit and rotary speed to deflect the bit away from the axis of the existing wellbore. In some cases, such as drilling steeply dipping formations or unpredictable deviation in conventional drilling operations, directional-drilling techniques may be employed to ensure that the hole is drilled vertically. While many techniques can accomplish this, the general concept is simple: point the bit in the direction that one wants to drill. The most common way is through the use of a bend near the bit in a down-hole steerable mud motor. The bend points the bit in a direction different from the axis of the wellbore when the entire drillstring is not rotating. By pumping mud through the mud motor, the bit turns while the drillstring does not rotate, allowing the bit to drill in the direction it points. When a particular wellbore direction is achieved, that direction may be maintained by rotating the entire drillstring (including the bent section) so that the bit does not drill in a single direction off the wellbore axis, but instead sweeps around and its net direction coincides with the existing wellbore. Rotary steerable tools allow steering while rotating, usually with higher rates of penetration and ultimately smoother boreholes.
Down-hole	Pertaining to or in the wellbore (as opposed to being on the surface).
Down-hole motor	A drilling motor located in the drill string above the drilling bit powered by the flow of drilling mud. Down-hole motors are used to increase the speed and efficiency of the drill bit or can be used to steer the bit in directional drilling operations. Drilling motors have become very popular because of horizontal and directional drilling applications and the day rates for drilling rigs.
Drilling rig	The machine used to drill a wellbore.
Drillpipe or Drill pipe	Tubular steel conduit fitted with special threaded ends called tool joints. The drillpipe connects the rig surface equipment with the bottomhole assembly and the bit, both to pump drilling fluid to the bit and to be able to raise, lower and rotate the bottomhole assembly and bit.
Drillstring or Drill string	The combination of the drillpipe, the bottomhole assembly and any other tools used to make the drill bit turn at the bottom of the wellbore.
Horizontal drilling	A subset of the more general term “directional drilling,” used where the departure of the wellbore from vertical exceeds about 80 degrees. Note that some horizontal wells are designed such that after reaching true 90-degree horizontal, the wellbore may actually start drilling upward. In such cases, the angle past 90 degrees is continued, as in 95 degrees, rather than reporting it as deviation from vertical, which would then be 85 degrees. Because a horizontal well typically penetrates a greater length of the reservoir, it can offer significant production improvement over a vertical well.
Hydraulic fracturing	A stimulation treatment routinely performed on oil and gas wells in low permeability reservoirs. Specially engineered fluids are pumped at high pressure and rate into the reservoir interval to be treated, causing a vertical fracture to open. The wings of the fracture extend away from the wellbore in opposing directions according to the natural stresses within the formation. Proppant, such as grains of sand of a particular size, is mixed with the treatment fluid to keep the fracture open when the treatment is complete. Hydraulic fracturing creates high-conductivity communication with a large area of formation and bypasses any damage that may exist in the near-wellbore area.
Hydrocarbon	A naturally occurring organic compound comprising hydrogen and carbon. Hydrocarbons can be as simple as methane, but many are highly complex molecules, and can occur as gases, liquids or solids. Petroleum is a complex mixture of hydrocarbons. The most common hydrocarbons are natural gas, oil and coal.

i

Mesh size	The size of the proppant that is determined by sieving the proppant through screens with uniform openings corresponding to the desired size of the proppant. Each type of proppant comes in various sizes, categorized as mesh sizes, and the various mesh sizes are used in different applications in the oil and natural gas industry. The mesh number system is a measure of the number of equally sized openings per square inch of screen through which the proppant is sieved.
Mud motors	A positive displacement drilling motor that uses hydraulic horsepower of the drilling fluid to drive the drill bit. Mud motors are used extensively in directional drilling operations.
Natural gas liquids	Components of natural gas that are liquid at surface in field facilities or in gas processing plants. Natural gas liquids can be classified according to their vapor pressures as low (condensate), intermediate (natural gasoline) and high (liquefied petroleum gas) vapor pressure.
Nitrogen pumping unit	A high-pressure pump or compressor unit capable of delivering high-purity nitrogen gas for use in oil or gas wells. Two basic types of units are commonly available: a nitrogen converter unit that pumps liquid nitrogen at high pressure through a heat exchanger or converter to deliver high-pressure gas at ambient temperature, and a nitrogen generator unit that compresses and separates air to provide a supply of high pressure nitrogen gas.
Plugging	The process of permanently closing oil and gas wells no longer capable of producing in economic quantities. Plugging work can be performed with a well servicing rig along with wireline and cementing equipment; however, this service is typically provided by companies that specialize in plugging work.
Plug	A down-hole packer assembly used in a well to seal off or isolate a particular formation for testing, acidizing, cementing, etc.; also a type of plug used to seal off a well temporarily while the wellhead is removed.
Pounds per square inch	A unit of pressure. It is the pressure resulting from a one pound force applied to an area of one square inch.
Pressure pumping	Services that include the pumping of liquids under pressure.
Producing formation	An underground rock formation from which oil, natural gas or water is produced. Any porous rock will contain fluids of some sort, and all rocks at considerable distance below the Earth’s surface will initially be under pressure, often related to the hydrostatic column of ground waters above the reservoir. To produce, rocks must also have permeability, or the capacity to permit fluids to flow through them.
Proppant	Sized particles mixed with fracturing fluid to hold fractures open after a hydraulic fracturing treatment. In addition to naturally occurring sand grains, man-made or specially engineered proppants, such as resin-coated sand or high-strength ceramic materials like sintered bauxite, may also be used. Proppant materials are carefully sorted for size and sphericity to provide an efficient conduit for production of fluid from the reservoir to the wellbore.
Resource play	Accumulation of hydrocarbons known to exist over a large area.
Shale	A fine-grained, fissile, sedimentary rock formed by consolidation of clay- and silt-sized particles into thin, relatively impermeable layers.
Tight oil	Conventional oil that is found within reservoirs with very low permeability. The oil contained within these reservoir rocks typically will not flow to the wellbore at economic rates without assistance from technologically advanced drilling and completion processes. Commonly, horizontal drilling coupled with multistage fracturing is used to access these difficult to produce reservoirs.
Tight sands	A type of unconventional tight reservoir. Tight reservoirs are those which have low permeability, often quantified as less than 0.1 millidarcies.
Tubulars	A generic term pertaining to any type of oilfield pipe, such as drill pipe, drill collars, pup joints, casing, production tubing and pipeline.
Unconventional resource	An umbrella term for oil and natural gas that is produced by means that do not meet the criteria for conventional production. What has qualified as “unconventional” at any particular time is a complex function of resource characteristics, the available exploration and production technologies, the economic environment, and the scale, frequency and duration of production from the resource. Perceptions of these factors inevitably change over time and often differ among users of the term. At present, the term is used in reference to oil and gas resources whose porosity, permeability, fluid trapping mechanism, or other characteristics differ from conventional sandstone and carbonate reservoirs. Coalbed methane, gas hydrates, shale gas, fractured reservoirs and tight gas sands are considered unconventional resources.
Wellbore	The physical conduit from surface into the hydrocarbon reservoir.
Well stimulation	A treatment performed to restore or enhance the productivity of a well. Stimulation treatments fall into two main groups, hydraulic fracturing treatments and matrix treatments. Fracturing treatments are performed above the fracture pressure of the reservoir formation and create a highly conductive flow path between the reservoir and the wellbore. Matrix treatments are performed below the reservoir fracture pressure and generally are designed to restore the natural permeability of the reservoir following damage to the near wellbore area. Stimulation in shale gas reservoirs typically takes the form of hydraulic fracturing treatments.
Wireline	A general term used to describe well-intervention operations conducted using single-strand or multi-strand wire or cable for intervention in oil or gas wells. Although applied inconsistently, the term commonly is used in association with electric logging and cables incorporating electrical conductors.
Workover	The process of performing major maintenance or remedial treatments on an oil or gas well. In many cases, workover implies the removal and replacement of the production tubing string after the well has been killed and a workover rig has been placed on location. Through-tubing workover operations, using coiled tubing, snubbing or slickline equipment, are routinely conducted to complete treatments or well service activities that avoid a full workover where the tubing is removed. This operation saves considerable time and expense.

ii

The following is a glossary of certain electrical infrastructure industry terms used in this report:
Distribution	The distribution of electricity from the transmission system to individual customers.
Substation	A part of an electrical transmission and distribution system that transforms voltage from high to low, or the reverse.
Transmission	The movement of electrical energy from a generating site, such as a power plant, to an electric substation.

iii

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Various statements contained in this report that express a belief, expectation, or intention, or that are not statements of historical fact, are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, or the Exchange Act. In particular, the factors discussed in this report and detailed under Part II, Item 1A. Risk Factors in this report and our Annual Report on Form 10–K for the year ended December 31, 2017 could affect our actual results and cause our actual results to differ materially from expectations, estimates or assumptions expressed, forecasted or implied in such forward-looking statements.

Forward-looking statements may include statements about our:

• business strategy;

• pending or future acquisitions and future capital expenditures;

• ability to obtain permits and governmental approvals;

• technology;

• financial strategy;

• future operating results; and

• plans, objectives, expectations and intentions.

All of these types of statements, other than statements of historical fact included in this quarterly report, are forward-looking statements. These forward-looking statements may be found in the “Business,” “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and other sections of this quarterly report. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “could,” “should,” “would,” “expect,” “plan,” “project,” “budget,” “intend,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” “pursue,” “target,” “seek,” “objective,” “continue,” “will be,” “will benefit,” or “will continue,” the negative of such terms or other comparable terminology.

The forward-looking statements contained in this report are largely based on our expectations, which reflect estimates and assumptions made by our management. These estimates and assumptions reflect our best judgment based on currently known market conditions and other factors, which are difficult to predict and many of which are beyond our control. Although we believe such estimates and assumptions to be reasonable, they are inherently uncertain and involve a number of risks and uncertainties that are beyond our control. In addition, our management’s assumptions about future events may prove to be inaccurate. Our management cautions all readers that the forward-looking statements contained in this report are not guarantees of future performance, and we cannot assure any reader that such statements will be realized or the forward-looking events and circumstances will occur. Actual results may differ materially from those anticipated or implied in the forward-looking statements due to many factors including those described in Part II, Item 1A. Risk Factors in this report and our Annual Report on Form 10–K for the year ended December 31, 2017 and Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" and elsewhere in this report. All forward-looking statements speak only as of the date of this report. We do not intend to publicly update or revise any forward-looking statements as a result of new information, future events or otherwise. These cautionary statements qualify all forward-looking statements attributable to us or persons acting on our behalf.

iv

MAMMOTH ENERGY SERVICES, INC.

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

MAMMOTH ENERGY SERVICES, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited)

ASSETS	June 30,			December 31,
	2018			2017
CURRENT ASSETS	(in thousands)
Cash and cash equivalents	$	10,702		$	5,637
Accounts receivable, net	312,850			243,746
Receivables from related parties	30,674			33,788
Inventories	12,717			17,814
Prepaid expenses	13,811			12,552
Other current assets	816			886
Total current assets	381,570			314,423
Property, plant and equipment, net	423,315			351,017
Sand reserves	73,759			74,769
Intangible assets, net - customer relationships	6,204			9,623
Intangible assets, net - trade names	6,726			6,516
Goodwill	101,511			99,811
Deferred income tax asset	31,892			6,739
Other non-current assets	4,146			4,345
Total assets	$	1,029,123		$	867,243
LIABILITIES AND EQUITY
CURRENT LIABILITIES
Accounts payable	$	177,353		$	141,306
Payables to related parties	1,916			1,378
Accrued expenses and other current liabilities	54,701			40,895
Income taxes payable	131,210			36,409
Total current liabilities	365,180			219,988
Long-term debt	—			99,900
Deferred income tax liabilities	31,036			34,147
Asset retirement obligation	3,138			2,123
Other liabilities	4,100			3,289
Total liabilities	403,454			359,447
COMMITMENTS AND CONTINGENCIES (Note 18)
EQUITY
Equity:
Common stock, $0.01 par value, 200,000,000 shares authorized, 44,752,765 and 44,589,306 issued and outstanding at June 30, 2018 and December 31, 2017, respectively	448			446
Additional paid in capital	528,421			508,010
Retained earnings	100,247			2,001
Accumulated other comprehensive loss	(3,447		)	(2,661		)
Total equity	625,669			507,796
Total liabilities and equity	$	1,029,123		$	867,243

The accompanying notes are an integral part of these condensed consolidated financial statements.

1

MAMMOTH ENERGY SERVICES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
REVENUE	(in thousands, except per share amounts)
Services revenue	$	455,545		$	29,659		$	864,204		$	56,751
Services revenue - related parties	40,611			44,603			89,699			77,565
Product revenue	27,708			10,395			52,748			13,767
Product revenue - related parties	9,730			13,605			21,192			25,145
Total revenue	533,594			98,262			1,027,843			173,228
COST AND EXPENSES
Services cost of revenue (exclusive of depreciation, depletion, amortization and accretion of $26,898, $51,473, $17,651 and $33,489, respectively, for the three and six months ended June 30, 2018 and three and six months ended June 30, 2017)	302,283			57,104			593,262			102,565
Services cost of revenue - related parties (exclusive of depreciation, depletion, amortization and accretion of $0, $0, $0 and $0, respectively, for the three and six months ended June 30, 2018 and three and six months ended June 30, 2017)	2,428			262			4,220			692
Product cost of revenue (exclusive of depreciation, depletion, amortization and accretion of $3,879, $6,193, $2,204 and $3,566, respectively, for the three and six months ended June 30, 2018 and three and six months ended June 30, 2017)	35,117			19,974			68,447			32,581
Selling, general and administrative (Note 12)	64,595			7,393			102,677			13,806
Selling, general and administrative - related parties	532			307			961			631
Depreciation, depletion, amortization and accretion	30,795			19,893			57,703			37,130
Impairment of long-lived assets	187			—			187			—
Total cost and expenses	435,937			104,933			827,457			187,405
Operating income (loss)	97,657			(6,671		)	200,386			(14,177		)
OTHER (EXPENSE) INCOME
Interest expense, net	(959		)	(1,112		)	(2,196		)	(1,509		)
Bargain purchase gain, net of tax	—			4,012			—			4,012
Other, net	(486		)	(203		)	(514		)	(387		)
Total other (expense) income	(1,445		)	2,697			(2,710		)	2,116
Income (loss) before income taxes	96,212			(3,974		)	197,676			(12,061		)
Provision (benefit) for income taxes	53,512			(2,804		)	99,430			(5,910		)
Net income (loss)	$	42,700		$	(1,170	)	$	98,246		$	(6,151	)
OTHER COMPREHENSIVE INCOME (LOSS)
Foreign currency translation adjustment, net of tax of $86, $272, $434 and $454, respectively, for the three and six months ended June 30, 2018 and three and six months ended June 30, 2017	(325		)	181			(786		)	409
Comprehensive income (loss)	$	42,375		$	(989	)	$	97,460		$	(5,742	)
Net income (loss) per share (basic) (Note 14)	$	0.95		$	(0.03	)	$	2.20		$	(0.16	)
Net income (loss) per share (diluted) (Note 14)	$	0.95		$	(0.03	)	$	2.18		$	(0.16	)
Weighted average number of shares outstanding (basic) (Note 14)	44,737			39,500			44,700			38,506
Weighted average number of shares outstanding (diluted) (Note 14)	45,059			39,500			44,977			38,506

The accompanying notes are an integral part of these condensed consolidated financial statements.

2

MAMMOTH ENERGY SERVICES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited)

							Retained			Additional
	Common Stock			Members'			Earnings			Paid-In
	Shares	Amount		Equity			(Deficit)			Capital		AOCL			Total
	(in thousands)
Balance at January 1, 2017	37,500	$	375	$	81,739		$	(56,323	)	$	400,206	$	(3,216	)	$	422,781
Net income of Sturgeon prior to acquisition	—	—		640			—			—		—			640
Stingray acquisition	1,393	14		—			—			25,748		—			25,762
Sturgeon acquisition	5,607	56		(82,379		)	—			78,313		—			(4,010		)
Stock based compensation	89	1		—			—			3,743		—			3,744
Net income	—	—		—			58,324			—		—			58,324
Other comprehensive income	—	—		—			—			—		555			555
Balance at December 31, 2017	44,589	$	446	$	—		$	2,001		$	508,010	$	(2,661	)	$	507,796
Equity based compensation (Note 15)	—	—		—			—			17,487		—			17,487
Stock based compensation	164	2		—			—			2,924		—			2,926
Net income	—	—		—			98,246			—		—			98,246
Other comprehensive loss	—	—		—			—			—		(786		)	(786		)
Balance at June 30, 2018	44,753	$	448	$	—		$	100,247		$	528,421	$	(3,447	)	$	625,669

The accompanying notes are an integral part of these condensed consolidated financial statements.

3

MAMMOTH ENERGY SERVICES, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)

	Six Months Ended June 30,
	2018			2017
	(in thousands)
Cash flows from operating activities:
Net income (loss)	$	98,246		$	(6,151	)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Equity based compensation (Note 15)	17,487			—
Stock based compensation	2,916			1,620
Depreciation, depletion, accretion and amortization	57,703			37,130
Amortization of coil tubing strings	1,120			1,046
Amortization of debt origination costs	199			199
Bad debt expense	53,790			19
(Gain) loss on disposal of property and equipment	(128		)	127
Gain on bargain purchase	—			(4,012		)
Impairment of long-lived assets	187			—
Deferred income taxes	(27,906		)	(6,529		)
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(122,908		)	(4,793		)
Receivables from related parties	3,114			(12,995		)
Inventories	4,156			(4,932		)
Prepaid expenses and other assets	(1,195		)	1,528
Accounts payable	34,186			20,557
Payables to related parties	538			(83		)
Accrued expenses and other liabilities	10,193			1,301
Income taxes payable	94,753			(28		)
Net cash provided by operating activities	226,451			24,004
Cash flows from investing activities:
Purchases of property and equipment	(105,349		)	(66,575		)
Purchases of property and equipment from related parties	(3,436		)	—
Business acquisitions	(13,356		)	(39,570		)
Proceeds from disposal of property and equipment	898			781
Business combination cash acquired (Note 4)	—			2,671
Net cash used in investing activities	(121,243		)	(102,693		)
Cash flows from financing activities:
Borrowings from lines of credit	52,000			79,150
Repayments of lines of credit	(151,900		)	(14,150		)
Repayments of equipment financing note	(145		)	—
Repayment of Stingray acquisition long-term debt	—			(7,074		)
Net cash (used in) provided by financing activities	(100,045		)	57,926
Effect of foreign exchange rate on cash	(98		)	73
Net change in cash and cash equivalents	5,065			(20,690		)
Cash and cash equivalents at beginning of period	5,637			29,239
Cash and cash equivalents at end of period	$	10,702		$	8,549
Supplemental disclosure of cash flow information:
Cash paid for interest	$	2,543		$	1,086
Cash paid for income taxes	$	32,584		$	912
Supplemental disclosure of non-cash transactions:
Purchases of property and equipment included in accounts payable and accrued expenses	$	20,897		$	7,836
Acquisition of Sturgeon, Stingray Cementing LLC and Stingray Energy Services LLC (Note 4)	$	—		$	23,091

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1. Organization and Nature of Business

Mammoth Energy Services, Inc. (the “Company,” “Mammoth Inc.” or “Mammoth”), together with its subsidiaries, is an integrated, growth-oriented company serving both the oil and gas and the electric utility industries in North America and U.S. territories. Mammoth's subsidiaries provide a diversified set of drilling and completion services to the exploration and production industry and its infrastructure division provides transmission, distribution and logistics services to various public and privately owned utilities throughout the U.S. and Puerto Rico. The Company was incorporated in Delaware in June 2016 as a wholly-owned subsidiary of Mammoth Energy Partners LP, a Delaware limited partnership (the “Partnership” or the “Predecessor”). The Partnership was originally formed by Wexford Capital LP (“Wexford”) in February 2014 as a holding company under the name Redback Inc. and was converted to a Delaware limited partnership in August 2014. On November 24, 2014, Mammoth Energy Holdings LLC (“Mammoth Holdings,” an entity controlled by Wexford), Gulfport Energy Corporation (“Gulfport”) and Rhino Resource Partners LP (“Rhino”) (collectively known as the “Predecessor Interest”) contributed their interest in certain of the entities presented below to the Partnership in exchange for 20 million limited partner units. Mammoth Energy Partners GP, LLC (the “General Partner”) held a non-economic general partner interest.

On October 12, 2016, the Partnership was converted into a Delaware limited liability company named Mammoth Energy Partners LLC (“Mammoth LLC”), and then Mammoth Holdings, Gulfport and Rhino, as all the members of Mammoth LLC, contributed their member interests in Mammoth LLC to Mammoth Inc. Prior to the conversion and the contribution, Mammoth Inc. was a wholly-owned subsidiary of the Partnership. Following the conversion and the contribution, Mammoth LLC (as the converted successor to the Partnership) was a wholly-owned subsidiary of Mammoth Inc. Mammoth Inc. did not conduct any material business operations until Mammoth LLC was contributed to it. On October 19, 2016, Mammoth Inc. closed its initial public offering of 7,750,000 shares of common stock (the “IPO”), which included an aggregate of 250,000 shares that were offered by Mammoth Holdings, Gulfport and Rhino, at a price to the public of $15.00 per share.

On June 29, 2018, Gulfport and MEH Sub LLC ("MEH Sub"), an entity controlled by Wexford, (collectively, the "Selling Stockholders") completed an underwritten secondary public offering of 4,000,000 shares of the Company’s common stock at a purchase price to the Selling Stockholders of $38.01 per share. The Selling Stockholders granted the underwriters an option to purchase up to an aggregate of 600,000 additional shares of the Company's common stock at the same purchase price. This option was exercised, in part, and on July 30, 2018, the underwriters purchased an additional 385,000 shares of common stock from the Selling Stockholders at the same price per share. The Selling Stockholders received all proceeds from this offering.

At June 30, 2018 and December 31, 2017, Wexford, Gulfport and Rhino beneficially owned the following shares of outstanding common stock of Mammoth Inc.:

	At June 30, 2018			At December 31, 2017
	Share Count	% Ownership		Share Count	% Ownership
Wexford	22,252,277	49.7	%	25,009,319	56.1	%
Gulfport	9,943,645	22.2	%	11,171,887	25.1	%
Rhino	104,100	0.2	%	568,794	1.3	%
Outstanding shares owned by related parties	32,300,022	72.1	%	36,750,000	82.5	%
Total outstanding	44,752,765	100.0	%	44,589,306	100.0	%

Operations

The Company's infrastructure services include electric utility contracting services focused on the repair, upgrade, maintenance and construction of transmission and distribution networks. The Company’s infrastructure services also provide storm repair and restoration services in response to natural disasters including hurricanes, ice or other storm-related damage. The Company's pressure pumping services include equipment and personnel used in connection with the completion and early production of oil and natural gas wells. The Company's natural sand proppant services include the distribution and production of natural sand proppant that is used primarily for hydraulic fracturing in the oil and gas industry. The Company's contract land and directional drilling services provides drilling rigs and directional tools for both

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vertical and horizontal drilling of oil and natural gas wells and salt water disposal wells. The Company also provides other services, including coil tubing units used to enhance the flow of oil and natural gas, flowback, cementing, aciziding, equipment rentals, crude oil hauling and remote accommodations.

All of the Company’s operations are in North America and in the Caribbean. The Company operates its oil and natural gas businesses in the Permian Basin, the Utica Shale, the Eagle Ford Shale, the Marcellus Shale, the Granite Wash, the SCOOP, the STACK, the Cana-Woodford Shale, the Cleveland Sand and the oil sands located in Northern Alberta, Canada. The Company operates its energy infrastructure services in the northeast, southwest and midwest portions of the United States and Puerto Rico. The Company's oil and natural gas business depends in large part on the conditions in the oil and natural gas industry and, specifically, on the amount of capital spending by its customers. Any prolonged increase or decrease in oil and natural gas prices affects the levels of exploration, development and production activity, as well as the entire health of the oil and natural gas industry. Changes in the commodity prices for oil and natural gas could have a material effect on the Company’s results of operations and financial condition. The Company’s business also depends on infrastructure spending on maintenance, upgrade, expansion and repair and restoration. Any prolonged decrease in spending by electric utility companies or delays or reductions in government appropriations could have a material adverse effect on the Company’s results of operations and financial condition.

2. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated interim financial statements include the accounts of the Company and its subsidiaries and the variable interest entity ("VIE") for which the Company is the primary beneficiary. All material intercompany accounts and transactions have been eliminated.

This report has been prepared in accordance with the rules and regulations of the Securities and Exchange Commission, and reflects all adjustments, which in the opinion of management are necessary for the fair presentation of the results for the interim periods, on a basis consistent with the annual audited consolidated financial statements. Certain information, accounting policies and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles (“GAAP”) have been omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the summary of significant accounting policies and notes thereto included in the Company’s most recent annual report on Form 10-K.

On June 5, 2017, the Company acquired Sturgeon Acquisitions LLC ("Sturgeon") and Sturgeon's wholly owned subsidiaries Taylor Frac, LLC, Taylor Real Estate Investments, LLC and South River Road, LLC. Prior to its acquisition of Sturgeon, the Company and Sturgeon were under common control and it is required under GAAP to account for this common control acquisition in a manner similar to the pooling of interest method of accounting. Therefore, the Company's historical financial information for all periods included in the accompanying financial statements has been recast to combine Sturgeon with the Company as if the acquisition had been effective since the date Sturgeon commenced operations. Refer to Note 4 - Acquisitions for additional disclosure regarding the acquisition of Sturgeon.

Accounts Receivable

Accounts receivable include amounts due from customers for services performed and are recorded as the work progresses. The Company grants credit to customers in the ordinary course of business and generally does not require collateral. Most areas in which the Company operates provide for a mechanic’s lien against the property on which the service is performed if the lien is filed within the statutorily specified time frame. Customer balances are generally considered delinquent if unpaid by the 30th day following the invoice date and credit privileges may be revoked if balances remain unpaid.

The Company regularly reviews receivables and provides for estimated losses through an allowance for doubtful accounts. In evaluating the level of established reserves, the Company makes judgments regarding its customers’ ability to make required payments, economic events and other factors. As the financial condition of customers changes, circumstances develop, or additional information becomes available, adjustments to the allowance for doubtful accounts may be required. In the event the Company was to determine that a customer may not be able to make required payments, the Company would increase the allowance through a charge to income in the period in which that determination is made. Uncollectible accounts receivable are periodically charged against the allowance for doubtful accounts once a final determination is made regarding their uncollectability.

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Following is a roll forward of the allowance for doubtful accounts for the year ended December 31, 2017 and the six months ended June 30, 2018 (in thousands):

Balance, January 1, 2017	$	5,377
Additions charged to expense	16,206
Additions other	179
Deductions for uncollectible receivables written off	(25		)
Balance, December 31, 2017	21,737
Additions charged to expense	53,790
Deductions for uncollectible receivables written off	(1,758		)
Balance, June 30, 2018	$	73,769

In October 2017, Cobra Acquisitions LLC ("Cobra"), one of the Company's subsidiaries, entered into a contract with the Puerto Rico Electric Power Authority ("PREPA") to perform repairs to PREPA’s electrical grid as a result of Hurricane Maria. At June 30, 2018 and December 31, 2017, the Company reviewed receivables due from PREPA and made specific reserves consistent with Company policy which resulted in additions to the allowance for doubtful accounts totaling $53.6 million and $16.0 million, respectively, for the six months ended June 30, 2018 and year ended December 31, 2017.

Additionally, the Company has made specific reserves consistent with Company policy which resulted in additions to allowance for doubtful accounts totaling $0.2 million and $0.2 million, respectively, for the six months ended June 30, 2018 and year ended December 31, 2017. The Company will continue to pursue collection until such time as final determination is made consistent with Company policy.

Concentrations of Credit Risk and Significant Customers

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents in excess of federally insured limits and trade receivables. Following is a summary of our significant customers based on percentages of total accounts receivable balances at June 30, 2018 and December 31, 2017 and percentages of total revenues derived for the three and six months ended June 30, 2018 and 2017:

	REVENUES								ACCOUNTS RECEIVABLE
	Three Months Ended June 30,				Six Months Ended June 30,				At June 30,		At December 31,
	2018		2017		2018		2017		2018		2017
Customer A(a)	65	%	—	%	65	%	—	%	59	%	56	%
Customer B(b)	9	%	59	%	11	%	59	%	9	%	12	%

a. Customer A is a third-party customer. Revenues and the related accounts receivable balances earned from Customer A were derived from the Company's infrastructure services segment.

b. Customer B is a related party customer. Revenues and the related accounts receivable balances earned from Customer B were derived from the Company's pressure pumping services segment, natural sand proppant services segment, contract land and directional drilling services segment and other businesses.

Fair Value of Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, trade receivables, trade payables, amounts receivable or payable to related parties, and long-term debt. The carrying amount of cash and cash equivalents, trade receivables, receivables from related parties and trade payables approximates fair value because of the short-term nature of the instruments. The fair value of long-term debt approximates its carrying value because the cost of borrowing fluctuates based upon market conditions.

New Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-2 “Leases” amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less.  All other leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. ASU 2016-2 is effective for fiscal years beginning after December 15, 2018,

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and interim periods within that fiscal year. The Company plans to adopt this ASU effective January 1, 2019 utilizing the modified retrospective method of adoption. This new leasing guidance will impact the Company in situations where it is the lessee, and in certain circumstances it will have a right-of-use asset and lease liability on its consolidated financial statements. The Company is currently evaluating the effect the new guidance may have on the Company's consolidated financial statements and results of operations.

In June 2018, the FASB issued ASU No. 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Accounting,” which simplifies the accounting for share-based payments granted to non-employees by aligning the accounting with requirements for employee share-based compensation. Upon transition, this ASU requires non-employee awards to be measured at fair value as of the adoption date. This ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. Early adoption is permitted. Currently, the Company has not elected to early adopt this ASU and is evaluating the impact it will have on the Company's consolidated financial statements.

3. Revenues

Adoption of ASC 606 "Revenues from Contracts with Customers"

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition, and most industry-specific guidance. The new guidance requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

On January 1, 2018, the Company adopted ASU 2014-09 and its related amendments (collectively, "ASC 606") using the modified retrospective method applied to contracts which were not completed as of January 1, 2018. Revenues for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts continue to be reported under previous revenue recognition guidance. While ASC 606 requires additional disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of the Company's revenues.

The adoption of ASC 606 represents a change in accounting principle. After evaluation of all contracts not completed as of January 1, 2018, the Company determined the cumulative effect of adopting ASC 606 was immaterial, and as such, has not recorded an adjustment to the opening balance of retained earnings on January 1, 2018.

Revenue Recognition

The following table presents revenues disaggregated by service line (in thousands):

	Three Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Revenue:
Pressure pumping services	$	101,406		$	50,196		$	202,544		$	90,836
Infrastructure services	360,250			1,709			685,709			1,709
Natural sand proppant services	52,845			24,762			103,860			40,359
Contract land and directional drilling services	17,210			12,472			32,440			23,223
Other services	20,167			10,242			43,062			19,092
Eliminations	(18,284		)	(1,119		)	(39,772		)	(1,991		)
Total revenue	$	533,594		$	98,262		$	1,027,843		$	173,228

Pressure Pumping Services

Pressure pumping services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Generally, the Company accounts for pressure pumping services as a single performance obligation satisfied over time. In certain circumstances, the Company supplies proppant that is utilized for pressure pumping as part of the agreement with the customer. The Company accounts for these pressure pumping agreements as multiple performance obligations satisfied over time. Jobs for these services are typically short-term in nature and range from a few hours to multiple days. Generally, revenue is recognized over time upon the

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completion of each segment of work based upon a completed field ticket, which includes the charges for the services performed, mobilization of the equipment to the location and personnel.

Pursuant to a contract with one of its customers, the Company has agreed to provide that customer with use of two pressure pumping fleets for the period covered by the contract. Under this agreement, performance obligations are satisfied as services are rendered based on the passage of time rather than the completion of each segment of work. The Company has the right to receive consideration from this customer even if circumstances prevent us from performing work. All consideration owed to the Company for services performed during the contractual period is fixed and the right to receive it is unconditional.

Additional revenue is generated through labor charges and the sale of consumable supplies that are incidental to the service being performed. Such amounts are recognized ratably over the period during which the corresponding goods and services are consumed.

Infrastructure Services

Infrastructure services are typically provided pursuant to master service agreements, repair and maintenance contracts or fixed price and non-fixed price installation contracts. Pricing under these contracts may be unit priced, cost-plus/hourly (or time and materials basis) or fixed price (or lump sum basis). The Company accounts for infrastructure services as a single performance obligation satisfied over time. Revenue is recognized over time as work progresses based on the days completed or as the contract is completed.

Natural Sand Proppant Services

The Company sells natural sand proppant through sand supply agreements with its customers. Under these agreements, sand is typically sold at a flat rate per ton or a flat rate per ton with an index-based adjustment. The Company recognizes revenue at the point in time when the customer obtains legal title to the product, which may occur at the production facility, rail origin or at the destination terminal.

Certain of the Company's sand supply agreements contain a minimum volume commitment related to sand purchases whereby the Company charges a shortfall payment if the customer fails to meet the required minimum volume commitment. These agreements may also contain make-up provisions whereby shortfall payments can be applied in future periods against purchased volumes exceeding the minimum volume commitment. If a make-up right exists, the Company has future performance obligations to deliver excess volumes of product in subsequent months. In accordance with ASC 606, if the customer fails to meet the minimum volume commitment, the Company will assess whether it expects the customer to fulfill its unmet commitment during the contractually specified make-up period based on discussions with the customer and management's knowledge of the business. If the Company expects the customer will make-up deficient volumes in future periods, revenue related to shortfall payments will be deferred and recognized on the earlier of the date on which the customer utilizes make-up volumes or the likelihood that the customer will exercise its right to make-up deficient volumes becomes remote. If the Company does not expect the customer will make-up deficient volumes in future periods, the breakage model will be applied and revenue related to shortfall payments will be recognized when the model indicates the customer's inability to take delivery of excess volumes. During the three and six months ended June 30, 2018, the Company recognized $0.3 million in revenue related to shortfall payments.

In certain of the Company's sand supply agreements, the customer obtains control of the product when it is loaded into rail cars and the customer reimburses the Company for all freight charges incurred. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the sand. If revenue is recognized for the related product before the shipping and handling activities occur, the Company accrues the related costs of those shipping and handling activities.

Contract Land and Directional Drilling Services

Contract drilling services are provided under daywork contracts. Directional drilling services, including motor rentals, are provided on a day rate or hourly basis, and revenue is recognized as work progresses. Performance obligations are satisfied over time as the work progresses based on the measure of output. Mobilization revenue and costs are recognized over the days of actual drilling.

Other Services

The Company also provides coil tubing, pressure control, flowback, cementing, acidizing, equipment rentals, crude oil hauling and remote accommodations services, which are reported under other services. These services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Performance obligations for these services are satisfied over time and revenue is recognized as the work

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progresses based on the measure of output. Jobs for these services are typically short-term in nature and range from a few hours to multiple days.

Practical Expedients

The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts in which variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied distinct good or service that forms part of a single performance obligation.

Performance Obligations and Contract Balances

As of June 30, 2018 and January 1, 2018, the Company had contract liabilities totaling $15.0 million, which are included in accrued expenses and other current liabilities in the unaudited condensed consolidated balance sheets, and did not have any contract assets. Revenue recognized in the current period from performance obligations satisfied in previous periods was a nominal amount for the three and six months ended June 30, 2018. As of June 30, 2018, the Company had unsatisfied performance obligations totaling $68.5 million, which will be recognized over the next 2.5 years.

4. Acquisitions

(a) Acquisition of WTL Oil

On May 31, 2018, the Company completed its acquisition of WTL Oil LLC ("WTL") for total consideration of $5.5 million in cash to the sellers plus $0.6 million in consideration to be paid upon completion of certain contractual obligations. As of June 30, 2018, the $0.6 million of contingent consideration is reflected in accrued expenses and other current liabilities on the unaudited condensed consolidated balance sheet. The seller completed these obligations and the Company paid the additional $0.6 million to the seller in July 2018.

The Company used cash on hand and borrowings under its credit facility to fund the acquisition. The acquisition of WTL expanded the Company's service offerings into the crude oil hauling business.

The following table summarizes the fair value of WTL as of May 31, 2018 (in thousands):

	WTL
Property, plant and equipment	$	2,960
Identifiable intangible assets - customer relationships(a)	930
Identifiable intangible assets - trade name(a)	650
Goodwill(b)	1,567
Total assets acquired	$	6,107

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 10-20 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, WTL provided the following activity (in thousands):

	2018
Revenues	$	595
Net income(a)	5

a.    Includes depreciation and amortization expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of WTL had occurred as of January 1, 2017 (in thousands):

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MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

	Six Months Ended
	June 30, 2018		June 30, 2017
Revenues	$	3,354	$	1,553
Net income	90		62

The Company recognized $0.1 million of transaction related costs during the three months ended June 30, 2018 related to this acquisition.

(b) Acquisition of RTS Energy Services

On June 15, 2018, the Company completed its acquisition of RTS Energy Services LLC ("RTS") for total consideration of $7.6 million in cash to the sellers plus $0.5 million to be paid 90 days after closing subject to contractual conditions. As of June 30, 2018, the $0.5 million of contingent consideration is reflected in accrued expenses and other current liabilities on the unaudited condensed consolidated balance sheet. The Company used cash on hand and borrowings under its credit facility to fund the acquisition. The acquisition of RTS expanded Mammoth's cementing services into the Permian Basin and added acidizing to the Company's service offerings.

The following table summarizes the fair value of RTS as of June 15, 2018 (in thousands):

	RTS
Inventory	$	180
Property, plant and equipment	7,787
Goodwill(a)	133
Total assets acquired	$	8,100

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, RTS provided the following activity (in thousands):

	2018
Revenues	$	630
Net income(a)	7

a.    Includes depreciation expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of RTS had occurred as of January 1, 2017 (in thousands):

	Six Months Ended
	June 30, 2018			June 30, 2017
Revenues	$	10,160		$	8,326
Net income (loss)	(848		)	653

The Company recognized a nominal amount of transaction related costs during the three months ended June 30, 2018 related to this acquisition.

(c) Acquisition of 5 Star

On July 1, 2017, the Company completed its acquisition of 5 Star for total consideration of $2.4 million in cash to the sellers. Mammoth funded the purchase price for 5 Star with cash on hand and borrowings under its credit facility. The acquisition of 5 Star added to the infrastructure component of the Company's business.

The Company recognized $0.1 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

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The following table summarizes the fair value of 5 Star as of July 1, 2017 (in thousands):

	5 Star
Accounts receivable	$	2,440
Property, plant and equipment	1,863
Identifiable intangible assets - trade names (a)	300
Goodwill (b)	248
Total assets acquired	$	4,851
Long-term debt and other liabilities	$	2,413
Total liabilities assumed	$	2,413
Net assets acquired	$	2,438

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Identifiable intangible assets will be amortized over 10 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, 5 Star provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	86,720	$	25,216
Net income (b)	12,903		4,191

a.Includes intercompany revenues of $77.5 million and $16.0 million, respectively, for 2018 and 2017.

b.Includes depreciation and amortization expense of $1.0 million and $0.8 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of 5 Star had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	6,332
Net loss	(282		)

(d) Acquisition of Higher Power

On April 21, 2017, the Company completed its acquisition of Higher Power for total consideration of $3.3 million in cash to the sellers plus up to $0.8 million in contingent consideration to be paid in equal annual installments over the next three years subject to contractual conditions. As of June 30, 2018, $0.3 million and $0.3 million, respectively, of the contingent consideration are reflected in accrued expenses and other current liabilities and other liabilities on the unaudited condensed consolidated balance sheet. Mammoth funded the purchase price for Higher Power with cash on hand and borrowings under its credit facility. The acquisition of Higher Power added an energy infrastructure component to the Company's business, helping to diversify its service offerings.

The Company recognized $0.1 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

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The following table summarizes the fair value of Higher Power as of April 21, 2017 (in thousands):

	Higher Power
Property, plant and equipment	$	1,744
Identifiable intangible assets - customer relationships	1,613
Goodwill (a)	643
Total assets acquired	$	4,000

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, Higher Power provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	122,734	$	39,571
Net income (b)	16,205		5,127

a.Includes intercompany revenues of $111.4 million and $27.4 million, respectively for 2018 and 2017.

b.Includes depreciation and amortization expense of $2.3 million and $2.0 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of Higher Power had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	4,481
Net loss	(411		)

(e) Acquisition of Sturgeon

On March 20, 2017, and as amended on May 12, 2017, the Company entered into a definitive contribution agreement with MEH Sub, Wexford Offshore Sturgeon Corp., Gulfport, Rhino and Mammoth Energy Partners LLC (the “Sturgeon Contribution Agreement”). Under the Sturgeon Contribution Agreement, the Company agreed to acquire, through its wholly-owned subsidiary Mammoth LLC, all outstanding membership interests in Sturgeon, which owns all of the membership interests in Taylor Frac, Taylor RE and South River (collectively, the "Sturgeon subsidiaries"). The acquisition added sand reserves, increased our production capacity and provided access to the Canadian National Railway, which affords access to the Appalachian basin in support of the Company’s pressure pumping services as well as to western Canada.

The acquisition of Sturgeon closed on June 5, 2017. Pursuant to the Sturgeon Contribution Agreement, Mammoth issued 5,607,452 shares of its common stock for all outstanding equity interests in Sturgeon. Based upon a closing price of Mammoth's common stock of $18.50 per share on June 5, 2017, the total purchase price was $103.7 million.

As a result of this transaction, the Company's historical financial information has been recast to combine the unaudited condensed consolidated statements of operations and the unaudited condensed consolidated balance sheets of the Company for all periods included in the accompanying financial statements with those of Sturgeon as if the combination had been in effect since Sturgeon commenced operations on September 13, 2014. Any material transactions between the Company and Sturgeon were eliminated. Sturgeon's financial results were incorporated into the Company's natural sand proppant services division.

For the year ended December 31, 2017, $1.3 million of transaction related costs were expensed.

(f) Acquisition of Chieftain

On March 27, 2017, as amended as of May 24, 2017, the Company entered into a Purchase Agreement with Chieftain Sand and Proppant, LLC and Chieftain Sand and Proppant Barron, LLC, unrelated third party sellers (the "Chieftain Sellers"), following the Company's successful bid in a bankruptcy court auction for substantially all of the assets of the

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MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Chieftain Sellers (the "Chieftain Assets"). This transaction (the "Chieftain Acquisition") closed on May 26, 2017. Mammoth funded the purchase price for the Chieftain Assets with cash on hand and borrowings under its revolving credit facility. The Chieftain Assets are held by the Company's wholly owned subsidiary Piranha and are included in the Company's sand segment. The Chieftain Acquisition added sand reserves, increased our production capacity and provided access to the Union Pacific railroad, which affords access to both the Mid-Continent and Permian basins in support of the Company’s pressure pumping services.

The following table summarizes the fair value of the Chieftain Acquisition as of May 26, 2017 (in thousands):

	Total
Property, plant and equipment (a)	$	23,373
Sand reserves (b)	20,910
Total assets acquired	$	44,283
Asset retirement obligation	1,732
Total liabilities assumed	$	1,732
Total allocation of purchase price	$	42,551
Bargain purchase price (c,d)	(6,231		)
Total purchase price	$	36,320

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. The fair value of the sand reserves was determined based on the excess cash flow method, a form of the income approach. The method provides a value based on the estimated remaining life of sand reserves, projected financial information and industry projections.

c. Amount reflected in unaudited condensed consolidated statements of comprehensive income (loss) reflected net of income taxes of $2.2 million.

d. The fair value of the business was determined based on the excess cash flow method, a form of the income approach.

From the acquisition date through June 30, 2018, the Chieftain Assets provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	35,128	$	22,847
Net income(b)	10,694		5,520

a.Includes intercompany revenues of $9.6 million and $12.3 million, respectively, for 2018 and 2017

b.Includes depreciation, depletion, amortization and accretion of $2.3 million and $2.8 million, respectively, for 2018 and 2017

The following table presents unaudited pro forma information as if the acquisition of the Chieftain Assets had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	1,312
Net loss	(72		)

The Company's historical financial information was adjusted to give pro forma effect to the events that were directly attributable to the Chieftain Acquisition. The Company recognized $0.8 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

14

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(g) Acquisition of Stingray

On March 20, 2017, and as amended on May 12, 2017, the Company entered into two definitive contribution agreements, one such agreement with MEH Sub, Wexford Offshore Stingray Energy Corp., Gulfport and Mammoth LLC and the other with MEH Sub, Wexford Offshore Stingray Pressure Pumping Corp., Gulfport and Mammoth LLC (collectively, the “Stingray Contribution Agreements”). Under the Stingray Contribution Agreements, the Company agreed to acquire, through its wholly-owned subsidiary Mammoth LLC, all outstanding membership interests in Stingray Cementing LLC ("Cementing") and Stingray Energy Services LLC ("SR Energy") (the “2017 Stingray Acquisition”). The addition of their water transfer, equipment rentals and cementing services further expanded and vertically integrated Mammoth’s service offerings.

The 2017 Stingray Acquisition closed on June 5, 2017. Pursuant to the Stingray Contribution Agreements, Mammoth issued 1,392,548 shares of its common stock for all outstanding equity interests in SR Energy and Cementing. Based upon a closing price of Mammoth's common stock of $18.50 per share on June 5, 2017, the total purchase price was $25.8 million.

The following tables summarize the fair values of Cementing and SR Energy as of June 5, 2017 (in thousands):

Consideration attributable to Cementing (a)	$	12,975
Consideration attributable to SR Energy (a)	12,787
Total consideration transferred	$	25,762

a.    See Summary of acquired assets and liabilities below

	SR Energy		Cementing		Total
	(in thousands)
Cash and cash equivalents	$	1,611	$	1,060	$	2,671
Accounts receivable, net	3,913		495		4,408
Receivables from related parties	3,684		1,418		5,102
Inventories	—		306		306
Prepaid expenses	35		32		67
Property, plant and equipment(a)	13,061		7,459		20,520
Identifiable intangible assets - customer relationships(b)	—		1,140		1,140
Identifiable intangible assets - trade names(b)	550		270		820
Goodwill(c)	3,929		6,264		10,193
Other assets	7		—		7
Total assets acquired	$	26,790	$	18,444	$	45,234
Accounts payable and accrued liabilities	$	5,890	$	2,063	$	7,953
Long-term debt (d)	5,074		2,000		7,074
Deferred tax liability	3,039		1,406		4,445
Total liabilities assumed	$	14,003	$	5,469	$	19,472
Net assets acquired	$	12,787	$	12,975	$	25,762

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 5-10 years.

c. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforces and future profitability expected to arise from the acquired entities.

d. Long-term debt assumed was paid off subsequent to the acquisitions.

15

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

From the acquisition date through June 30, 2018, SR Energy and Cementing provided the following activity (in thousands):

	2018						2017
	SR Energy			Cementing			SR Energy			Cementing
Revenues(a)	$	16,034		$	5,131		$	11,572		$	7,500
Net loss(b)	(1,586		)	(806		)	(1,626		)	(1,963		)

a. Includes intercompany revenues of $1.6 million and $0.6 million for SR Energy in 2018 and 2017.

b. Includes depreciation and amortization expense of $2.8 million and $1.0 million, respectively, for SR Energy and Cementing in 2018 and $3.4 million and $4.1 million, respectively, for SR Energy and Cementing in 2017.

The following table presents unaudited pro forma information as if the acquisition of SR Energy and Cementing had occurred on January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	18,333
Net loss	(1,612		)

The historical financial information was adjusted to give effect to the pro forma events that were directly attributable to the 2017 Stingray Acquisition. The unaudited pro forma consolidated results are not necessarily indicative of what the consolidated results of operations actually would have been had the 2017 Stingray Acquisition been completed on January 1, 2017. In addition, the unaudited pro forma consolidated results do not purport to project the future results of operations of the Company. The Company recognized $0.2 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

5. Inventories

Inventory consists of raw sand and processed sand available for sale, chemicals and other products sold as a bi-product of completion and production operations and supplies used in performing services. Inventory is stated at the lower of cost or market (net realizable value) on an average cost basis. The Company assesses the valuation of its inventories based upon specific usage and future utility. A summary of the Company's inventories is shown below (in thousands):

	June 30,		December 31,
	2018		2017
Supplies	$	7,264	$	9,437
Raw materials	321		219
Work in process	1,326		2,370
Finished goods	3,806		5,788
Total inventory	$	12,717	$	17,814

16

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

6. Property, Plant and Equipment     

Property, plant and equipment include the following (in thousands):

		June 30,		December 31,
	Useful Life	2018		2017
Pressure pumping equipment	3-5 years	$	199,333	$	190,211
Drilling rigs and related equipment	3-15 years	137,075		132,260
Machinery and equipment(a)	7-20 years	140,308		97,569
Buildings	15-39 years	47,593		45,992
Vehicles, trucks and trailers(b)	5-10 years	91,680		54,055
Coil tubing equipment	4-10 years	28,068		28,053
Land	N/A	14,183		11,317
Land improvements	15 years or life of lease	9,614		9,614
Rail improvements	10-20 years	13,101		5,540
Other property and equipment	3-12 years	15,006		12,687
		695,961		587,298
Deposits on equipment and equipment in process of assembly		33,349		20,348
		729,310		607,646
Less: accumulated depreciation(c)		305,995		256,629
Property, plant and equipment, net		$	423,315	$	351,017

a. Included in machinery and equipment are assets under capital leases totaling $1.8 million and $1.8 million, respectively, at June 30, 2018 and December 31, 2017.

b. Included in vehicles, trucks and trailers are assets under capital leases totaling $3.8 million and $1.0 million, respectively, at June 30, 2018 and December 31, 2017.

c. Accumulated depreciation for assets under capital leases totaled $0.9 million and $0.8 million, respectively, at June 30, 2018 and December 31, 2017.

Proceeds from customers for horizontal and directional drilling services equipment damaged or lost down-hole are reflected in revenue with the carrying value of the related equipment charged to cost of service revenues and are reported as cash inflows from investing activities in the statement of cash flows. For the six months ended June 30, 2018 and 2017, proceeds from the sale of equipment damaged or lost down-hole were $0.6 million and $0.3 million, respectively, and gains on sales of equipment damaged or lost down-hole were $0.5 million and $0.2 million, respectively.

A summary of depreciation, depletion, amortization and accretion expense is below (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Depreciation expense(a)	$	27,058	$	17,229	$	51,456	$	32,196
Depletion expense	1,340		382		1,427		384
Amortization expense	2,382		2,268		4,790		4,536
Accretion expense	15		14		30		14
Depreciation, depletion, amortization and accretion	$	30,795	$	19,893	$	57,703	$	37,130

a. Includes depreciation expense for assets under capital leases totaling $0.4 million and $0.2 million, respectively, for the six months ended June 30, 2018 and 2017.

Deposits on equipment and equipment in process of assembly represents deposits placed with vendors for equipment that is in the process of assembly and purchased equipment that is being outfitted for its intended use. The equipment is not yet placed in service.

17

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

7. Intangible Assets and Goodwill

The Company had the following definite lived intangible assets recorded (in thousands):

	June 30,			December 31,
	2018			2017
Customer relationships	$	36,725		$	35,795
Trade names	9,443			8,793
Less: accumulated amortization - customer relationships	(30,521		)	(26,172		)
Less: accumulated amortization - trade names	(2,717		)	(2,277		)
Intangible assets, net	$	12,930		$	16,139

Amortization expense for intangible assets was $4.8 million and $4.5 million, respectively, for the six months ended June 30, 2018 and 2017. The original life of customer relationships ranges from 4 to 10 years with a remaining average useful life of 3.9 years. The original life of trade names ranges from 10 to 20 years with a remaining average useful life of 9.1 years.

Aggregated expected amortization expense for the future periods is expected to be as follows (in thousands):

	Amount
Remainder of 2018	$	3,969
2019	1,293
2020	1,293
2021	1,288
2022	1,266
Thereafter	3,821
	$	12,930

Goodwill was $101.5 million and $99.8 million, respectively, at June 30, 2018 and December 31, 2017. Changes in the goodwill for the year ended December 31, 2017 and the six months ended June 30, 2018 are set forth below (in thousands):

Balance, January 1, 2017	$	88,727
Additions - 2017 Stingray Acquisition (Note 4)	10,193
Additions - Higher Power Acquisition (Note 4)	643
Additions - 5 Star Acquisition (Note 4)	248
Balance, December 31, 2017	99,811
Additions - WTL Acquisition (Note 4)	1,567
Additions - RTS Acquisition (Note 4)	133
Balance, June 30, 2018	$	101,511

18

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

8. Accrued Expenses and Other Current Liabilities

Accrued expense and other current liabilities included the following (in thousands):

	June 30,		December 31,
	2018		2017
Deferred revenue	15,100		15,210
Accrued compensation, benefits and related taxes	19,917		11,552
Financed insurance premiums	1,638		4,876
Insurance reserves	4,183		2,942
State and local taxes payable	8,205		2,126
Other	5,658		4,189
Total	$	54,701	$	40,895

Financed insurance premiums are due in monthly installments, are unsecured and mature within the twelve month period following the close of the year. As of June 30, 2018 and December 31, 2017, the applicable interest rate associated with financed insurance premiums was 2.75%.

9. Debt

Mammoth Credit Facility

On November 25, 2014, Mammoth entered into a revolving credit and security agreement with a syndicate of banks that provides for maximum borrowings of $170 million. The facility, as amended, matures on November 25, 2019. Borrowings under this facility are secured by the assets of Mammoth, inclusive of the subsidiary companies. The maximum availability of the facility is subject to a borrowing base calculation prepared monthly. Concurrent with the execution of the facility, the initial advance was used to repay all the debt of the Company then outstanding. Interest is payable monthly at a base rate set by the lead institution’s commercial lending group plus an applicable margin. Additionally, at the Company's request, outstanding balances are permitted to be converted to LIBOR rate plus applicable margin tranches at set increments of $0.5 million. The LIBOR rate option allows the Company to select interest periods from one, two, three or six months. The applicable margin for either the base rate or the LIBOR rate option can vary from 1.5% to 3.0%, based upon a calculation of the excess availability of the line as a percentage of the maximum credit limit. The deferred loan costs associated with this facility are classified in other non-current assets.

At June 30, 2018, there were no outstanding borrowings under the credit facility and $162.7 million of available borrowing capacity, after giving effect to $6.5 million of outstanding letters of credit. At December 31, 2017, there were outstanding borrowings under the credit facility of $99.9 million, leaving an aggregate of $62.8 million of borrowing capacity under the facility, after giving effect to $6.5 million of outstanding letters of credit.

The Mammoth facility also contains various customary affirmative and restrictive covenants. Among the various covenants are specifically identified financial covenants placing requirements of a minimum interest coverage ratio (3.0 to 1.0), maximum leverage ratio (4.0 to 1.0), and minimum availability ($10 million). As of June 30, 2018 and December 31, 2017, the Company was in compliance with the financial covenants under the facility.

Sturgeon Credit Facility

On June 30, 2015, Sturgeon entered in to a three-year $25.0 million revolving line of credit secured by substantially all of the assets of Sturgeon (“the Sturgeon revolver”). Advances under the Sturgeon revolver bore interest at 2% plus the greater of (a) the Base Rate as set by the lender's commercial lending group, (b) the sum of the Federal Funds Open Rate plus one half of one percent and (c) the sum of the Daily LIBOR rate. Additionally, at Sturgeon’s request, advances could be obtained at LIBOR plus 3%. The LIBOR rate option allowed Sturgeon to select interest periods from one, two, three or six month LIBOR futures spot rates. The Sturgeon revolver was terminated on June 6, 2017.

19

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

10. Other Liabilities

Other liabilities included the following (in thousands):

	June 30,			December 31,
	2018			2017
Capital lease obligations	$	4,253		$	2,015
Equipment financing arrangement	1,436			1,605
Other	250			500
Total	5,939			4,120
Less: Current portion of capital lease and equipment financing obligations included in accrued expenses and other current liabilities	(1,839		)	(831		)
Total Other Liabilities	$	4,100		$	3,289

The Company leases vehicles and other equipment under capital leases with varying terms and expiration dates through 2020. The weighted average implied interest rate under our capital leases as of June 30, 2018 and December 31, 2017 was 14.2% and 19.1%, respectively. Additionally, the Company entered into a five-year equipment financing arrangement maturing in 2022 that bears interest at 4.6% as of June 30, 2018. Principal and interest on capital leases and the equipment financing arrangement are paid monthly. Aggregate future payments under the Company's non-cancelable capital leases and equipment financing arrangement as of June 30, 2018 are as follows (in thousands):

2018	$	890
2019	2,593
2020	1,696
2021	664
2022	360
Total future minimum payments	6,203
Less interest payments	(514		)
Present value of future minimum payments	$	5,689

11. Variable Interest Entity

On April 6, 2018, Dire Wolf Energy Services LLC ("Dire Wolf"), a wholly owned subsidiary of the Company, entered into a Voting Trust Agreement with TVPX Aircraft Solutions Inc. (the "Voting Trustee"). Under the Voting Trust Agreement, Dire Wolf transferred 100% of its membership interest in Cobra Aviation Services LLC ("Cobra Aviation") to the Voting Trustee in exchange for Voting Trust Certificates. Dire Wolf retained the obligation to absorb all expected returns or losses of Cobra Aviation. Prior to the transfer of membership interest to the Voting Trustee, Cobra Aviation was a wholly owned subsidiary of Dire Wolf. Cobra Aviation owns and operates a helicopter primarily for services provided to Cobra Acquisitions, a wholly owned subsidiary of the Company. Dire Wolf entered into the Voting Trust Agreement in order to meet certain registration requirements.

Dire Wolf's voting rights are not proportional to its obligation to absorb expected returns or losses of Cobra Aviation and all of Cobra Aviation's activities are conducted on behalf of Dire Wolf, which has disproportionately fewer voting rights; therefore, Cobra Aviation meets the criteria of a VIE. Cobra Aviation's operational activities are directed by Dire Wolf's officers and Dire Wolf has the option to terminate the Voting Trust Agreement at any time. Therefore, the Company, through Dire Wolf, is considered the primary beneficiary of the VIE and consolidates Cobra Aviation at June 30, 2018.

20

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

12. Selling, General and Administrative Expense

Selling, general and administrative ("SG&A") expense includes of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cash expenses:
Compensation and benefits	$	10,978	$	2,966	$	18,677	$	5,381
Professional services	2,981		1,652		5,568		3,581
Other(a)	3,935		2,015		5,542		3,880
Total cash SG&A expense	17,894		6,633		29,787		12,842
Non-cash expenses:
Bad debt provision	28,263		17		53,790		(25		)
Equity based compensation(b)	17,487		—		17,487		—
Stock based compensation	1,483		1,050		2,574		1,620
Total non-cash SG&A expense	47,233		1,067		73,851		1,595
Total SG&A expense	$	65,127	$	7,700	$	103,638	$	14,437

a. Includes travel-related costs, IT expenses, rent, utilities and other general and administrative-related costs.

b. Represents compensation expense for non-employee awards, which were issued and are payable by certain affiliates of Wexford (the sponsor level). See Note 15 for additional detail.

13. Income Taxes

The components of income tax expense (benefit) attributable to the Company for the three and six months ended June 30, 2018 and 2017, are as follows (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Foreign current income tax expense	$	67,665		$	21		$	125,712		$	606
Foreign deferred income tax benefit	(15,266		)	(14		)	(25,386		)	(20		)
U.S. current income tax expense	1,636			—			1,624			—
U.S. deferred income tax benefit	(523		)	(2,811		)	(2,520		)	(6,496		)
Total	$	53,512		$	(2,804	)	$	99,430		$	(5,910	)

The Company's effective tax rate was 50% and 37%, respectively, for the six months ended June 30, 2018 and 2017. The increase in the effective tax rate is primarily due to the equity based compensation expense recognized during the six months ended June 30, 2018 as well as a higher tax rate in Puerto Rico, where most of our income was generated during the six months ended June 30, 2018, compared to the United States tax rate. No income was generated in Puerto Rico during the six months ended June 30, 2017. Additionally, the Company's effective tax rate can fluctuate as a result of, among other things, discrete items, state income taxes, permanent differences and changes in pre-tax income.

A valuation allowance for deferred tax assets is recognized when it is more likely than not that the benefit of deferred tax assets will not be realized. To assess that likelihood, the Company uses estimates and judgments regarding future taxable income, as well as the jurisdiction in which such taxable income is generated, to determine whether a valuation allowance is required. During the six months ended June 30, 2018, the Company recorded a change in valuation allowance of $9.2 million related to foreign tax credits that are not expected to be utilized.

On December 22, 2017, the United States enacted the Tax Cuts and Jobs Act (the “Tax Act”). As a result, the Company recorded a provisional amount for effects of the Tax Act totaling $31.0 million during the fourth quarter of 2017. The Company continues to evaluate the impact of the Tax Act and no revisions were recorded to the provisional amount during the six months ended June 30, 2018. The Company expects to complete its detailed analysis of the effects of the Tax Act no later than the fourth quarter of 2018.

21

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

14. Earnings (Loss) Per Share

Reconciliations of the components of basic and diluted net income (loss) per common share are presented in the table below (in thousands, except per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018		2017
Basic earnings (loss) per share:
Allocation of earnings:
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares outstanding	44,737		39,500			44,700		38,506
Basic earnings (loss) per share	$	0.95	$	(0.03	)	$	2.20	$	(0.16	)
Diluted earnings (loss) per share:
Allocation of earnings (loss):
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares, including dilutive effect (a)	45,059		39,500			44,977		38,506
Diluted earnings (loss) per share	$	0.95	$	(0.03	)	$	2.18	$	(0.16	)

^a.  No incremental shares of potentially dilutive restricted stock awards were included for the three and six months ended June 30, 2017 as their effect was antidulitive under the treasury stock method.

15. Equity Based Compensation

Upon formation of certain operating entities by Wexford, Gulfport and Rhino, specified members of management (the “Specified Members”) and certain non-employee members (the “Non-Employee Members”) were granted the right to receive distributions from the operating entities after the contribution member’s unreturned capital balance was recovered (referred to as “Payout” provision).

On November 24, 2014, the awards were modified in conjunction with the contribution of the operating entities to Mammoth. These awards were not granted in limited or general partner units. The awards are for interests in the distributable earnings of the members of MEH Sub, Mammoth’s majority equity holder.

On the IPO closing date, the unreturned capital balance of Mammoth's majority equity holder was not fully recovered from its sale of common stock in the IPO. As a result, Payout did not occur and no compensation cost was recorded.

On June 29, 2018, as part of an underwritten secondary public offering, MEH Sub sold 2,764,400 shares of the Company’s common stock at a purchase price to MEH Sub of $38.01 per share. MEH Sub received the proceeds from this offering. As a result, a portion of the Non-Employee Member awards reached Payout. During the three months ended June 30, 2018, the Company recognized equity compensation expense totaling $17.5 million related to these non-employee awards. These awards are at the sponsor level and this transaction had no dilutive impact or cash impact to the Company.

Payout for the remaining awards is expected to occur following additional sales by MEH Sub of its shares of the Company's common stock, which is considered not probable until the event occurs. For the Specified Member awards, the unrecognized amount, which represents the fair value of the award as of the modification dates or grant date, was $5.6 million. For the Non-Employee Member awards, the unrecognized amount, which represents the fair value of the awards as of June 30, 2018 was $43.1 million.

16. Stock Based Compensation

The 2016 Plan authorizes the Company's Board of Directors or the compensation committee of the Company's Board of Directors to grant restricted stock, restricted stock units, stock appreciation rights, stock options and performance awards. There are 4.5 million shares of common stock reserved for issuance under the 2016 Plan.

22

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Restricted Stock Units

The fair value of restricted stock unit awards was determined based on the fair market value of the Company's common stock on the date of the grant. This value is amortized over the vesting period.

A summary of the status and changes of the unvested shares of restricted stock under the 2016 Plan is presented below.

	Number of Unvested Restricted Shares		Weighted Average Grant-Date Fair Value
Unvested shares as of January 1, 2018	640,632		$	19.44
Granted	93,556		26.83
Vested	(149,098	)	21.29
Forfeited	—		—
Unvested shares as of June 30, 2018	585,090		$	21.07

As of June 30, 2018, there was $9.2 million of total unrecognized compensation cost related to the unvested restricted stock. The cost is expected to be recognized over a weighted average period of approximately 1.8 years.

Included in cost of revenue and selling, general and administrative expenses is stock based compensation expense of $1.7 million and $1.1 million, respectively, for the three months ended June 30, 2018 and 2017 and $2.9 million and $1.6 million, respectively, for the six months ended June 30, 2018 and 2017.

17. Related Party Transactions

Transactions between the subsidiaries of the Company and the following companies are included in Related Party Transactions: Gulfport; Grizzly Oil Sands ULC (“Grizzly”); El Toro Resources LLC (“El Toro”); Cementing and SR Energy (collectively, prior to the 2017 Stingray Acquisition, the “2017 Stingray Companies”); Everest Operations Management LLC (“Everest”); Elk City Yard LLC (“Elk City Yard”); Double Barrel Downhole Technologies LLC (“DBDHT”); Caliber Investment Group LLC (“Caliber”); Dunvegan North Oilfield Services ULC (“Dunvegan”); Predator Drilling LLC (“Predator”); and T&E Flow Services LLC (“T&E”).

Following is a summary of related party transactions (in thousands):

		REVENUES								ACCOUNTS RECEIVABLE
		Three Months Ended June 30,				Six Months Ended June 30,				At June 30,			At December 31,
		2018		2017		2018		2017		2018			2017
Pressure Pumping and Gulfport	(a)	$	33,831	$	41,100	$	72,377	$	72,845	$	20,127		$	25,054
Muskie and Gulfport	(b)	9,730		13,605		21,192		25,145		4,428			1,947
Panther Drilling and Gulfport	(c)	—		952		56		1,994		12			872
Cementing and Gulfport	(d)	2,048		903		4,876		903		1,739			2,255
SR Energy and Gulfport	(e)	4,626		1,565		11,579		1,565		4,292			3,348
Panther Drilling and El Toro	(f)	—		—		345		—		—			—
Redback Energy and El Toro	(g)	92		34		92		158		—			—
Coil Tubing and El Toro	(h)	—		—		360		—		(2		)	—
Bison Drilling and Predator	(i)	—		—		—		—		—			234
Other Relationships		14		49		14		100		78			78
		$	50,341	$	58,208	$	110,891	$	102,710	$	30,674		$	33,788

a. Pressure Pumping provides pressure pumping, stimulation and related completion services to Gulfport.

b. Muskie has agreed to sell and deliver, and Gulfport has agreed to purchase, specified annual and monthly amounts of natural sand proppant, subject to certain exceptions specified in the agreement, and pay certain costs and expenses.

c. Panther Drilling performs drilling services for Gulfport pursuant to a master service agreement.

d. Cementing performs well cementing services for Gulfport.

e. SR Energy performs rental services for Gulfport.

f. Panther provides services for El Toro, an entity controlled by Wexford, pursuant to a master service agreement.

g. Redback Energy performs completion and production services for El Toro pursuant to a master service agreement.

h. Coil Tubing provides to El Toro services in connection with completion and drilling activities.

i. Bison Drilling provides equipment rentals to Predator, an entity in which Wexford owns a minority interest.

23

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

		Three Months Ended June 30,					Six Months Ended June 30,				At June 30,		At December 31,
		2018			2017		2018		2017		2018		2017
		COST OF REVENUE					COST OF REVENUE				ACCOUNTS PAYABLE
Cobra and T&E	(a)	$	1,486		$	—	$	2,762	$	—	$	289	$	457
Higher Power and T&E	(a)	950			—		1,458		—		576		3
Panther and DBDHT	(b)	—			—		—		128		—		77
The Company and 2017 Stingray Companies	(c)	—			207		—		444		—		—
Other		(8		)	55		—		120		—		218
		$	2,428		$	262	$	4,220	$	692	$	865	$	755
		SELLING, GENERAL AND ADMINISTRATIVE COSTS					SELLING, GENERAL AND ADMINISTRATIVE COSTS
The Company and Everest	(d)	$	55		$	50	$	86	$	108	$	6	$	19
The Company and Wexford	(e)	290			165		473		398		78		150
The Company and Caliber	(f)	145			72		346		72		47		1
Other		42			20		56		53		—		2
		$	532		$	307	$	961	$	631	$	131	$	172
		CAPITAL EXPENDITURES					CAPITAL EXPENDITURES
Cobra and T&E	(a)	$	757		$	—	$	1,131	$	—	$	170	$	66
Higher Power and T&E	(a)	1,575			—		2,773		—		750		385
		$	2,332		$	—	$	3,904	$	—	$	920	$	451
											$	1,916	$	1,378

a. Cobra and Higher Power purchase materials and services from T&E, an entity in which a member of management's family owns a minority interest.

b. Panther rents rotary steerable equipment in connection with its directional drilling services from DBDHT.

c. Prior to the 2017 Stingray Acquisition, the 2017 Stingray Companies provided certain services to the Company and, from time to time, the 2017 Stingray Companies paid for goods and services on behalf of the Company.

d. Everest has historically provided office space and certain technical, administrative and payroll services to the Company and the Company has reimbursed Everest in amounts determined by Everest based on estimates of the amount of office space provided and the amount of employees’ time spent performing services for the Company.

e. Wexford provides certain administrative and analytical services to the Company and, from time to time, the Company pays for goods and services on behalf of Wexford.

f. Caliber leases office space to Mammoth.

On June 29, 2018, Gulfport and certain entities controlled by Wexford (the "Selling Stockholders") completed an underwritten secondary public offering of 4,000,000 shares of the Company’s common stock at a purchase price to the Selling Stockholders of $38.01 per share. The Selling Stockholders received all proceeds from this offering. The Company incurred costs of approximately $0.7 million related to the secondary public offering during the three months ended June 30, 2018.

18. Commitments and Contingencies

Lease Obligations

The Company leases real estate, rail cars and other equipment under long-term operating leases with varying terms and expiration dates through 2062.

Minimum Purchase Commitments

The Company has entered into agreements with suppliers that contain minimum purchase obligations. Failure to purchase the minimum amounts may require the Company to pay shortfall fees. However, the minimum quantities set forth in the agreements are not in excess of currently expected future requirements.

Capital Spend Commitments

The Company has entered into agreements with suppliers to acquire capital equipment.

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MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Aggregate future minimum payments under these obligations in effect at June 30, 2018 are as follows (in thousands):

Year ended December 31:	Operating Leases		Capital Spend Commitments		Minimum Purchase Commitments
Remainder of 2018	$	12,148	$	16,393	$	19,254
2019	18,091		—		12,125
2020	15,622		—		400
2021	12,029		—		165
2022	8,995		—		—
Thereafter	6,057		—		—
	$	72,942	$	16,393	$	31,944

For the six months ended June 30, 2018 and 2017, the Company recognized rent expense of $10.2 million and $4.2 million, respectively.

The Company has various letters of credit that were issued under the Company's revolving credit agreement which is collateralized by substantially all of the assets of the Company. The letters of credit are categorized below (in thousands):

	June 30,		December 31,
	2018		2017
Environmental remediation	$	3,582	$	3,582
Insurance programs	2,486		2,486
Rail car commitments	455		455
Total letters of credit	$	6,523	$	6,523

The Company has insurance coverage for physical partial loss to its assets, employer’s liability, automobile liability, commercial general liability, workers’ compensation and insurance for other specific risks. The Company has also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. As of June 30, 2018 and December 31, 2017, the policies require a deductible per occurrence of up to $0.3 million. The Company establishes liabilities for the unpaid deductible portion of claims incurred relating to physical loss to its assets, employer's liability, automobile liability, commercial general liability and workers’ compensation based on estimates. As of June 30, 2018 and December 31, 2017, the policies contained an aggregate stop loss of $2.0 million. The Company also self-insures its employee health insurance. The Company has coverage on its self-insurance program in the form of a stop loss of $0.2 million per participant and an aggregate stop-loss of $5.8 million for the calendar year ending December 31, 2018. These estimates may change in the near term as actual claims continue to develop. As of June 30, 2018 and December 31, 2017, accrued insurance claims were $4.2 million and $2.9 million, respectively.

Pursuant to certain customer contracts in our infrastructure services segment, the Company warrants equipment and labor performed under the contracts for a specified period following substantial completion of the work. Generally, the warranty is for one year or less. No liabilities were accrued as of June 30, 2018 and December 31, 2017 and no expense was recognized during the six months ended June 30, 2018 or 2017 related to warranty claims. However, if warranty claims occur, the Company could be required to repair or replace warrantied items, which in most cases are covered by warranties extended from the manufacturer of the equipment. In the event the manufacturer of equipment failed to perform on a warranty obligation or denied a warranty claim made by the Company, the Company could be required to pay for the cost of the repair or replacement.

In the ordinary course of business, the Company is required to provide bid bonds to certain customers in the infrastructure services segment as part of the bidding process. These bonds provide a guarantee to the customer that the Company, if awarded the project, will perform under the terms of the contract. Bid bonds are typically provided for a percentage of the total contract value. Additionally, the Company may be required to provide performance and payment bonds for contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it

25

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

incurs. As of June 30, 2018, outstanding bid bonds and performance and payment bonds totaled $1.1 million and $1.6 million, respectively. The estimated the cost to complete projects secured by the performance and payment bonds totaled $0.6 million as of June 30, 2018. As of December 31, 2017, the Company did not have any outstanding bid bonds or performance and payment bonds.

The Company is routinely involved in state and local tax audits. During 2015, the State of Ohio assessed taxes on the purchase of equipment the Company believes is exempt under state law. The Company appealed the assessment and a hearing was held in 2017. As a result of the hearing, the Company received a decision from the State of Ohio. The Company is appealing the decision and while it is not able to predict the outcome of the appeal, this matter is not expected to have a material adverse effect on the Company's financial position, results of operations or cash flows.

On August 1, 2016, a putative class and collective action lawsuit alleging that Redback Energy failed to pay a class of workers overtime in compliance with the Fair Labor Standards Act and Texas law was filed titled Michael Caffey, individually and on behalf of all others similarly situated v. Redback Energy Services LLC in the U.S. District Court for the Western District of Texas. The parties reached a settlement of this matter in April 2017. The settlement was paid and did not have a material impact on the Company's financial position, results of operations or cash flows.

On January 26, 2017, a collective action lawsuit alleging that Stingray Pressure Pumping LLC ("Pressure Pumping") failed to pay a class of workers in compliance with the Fair Labor Standards Act was filed titled Ryan Crosby vs. Stingray Pressure Pumping LLC, in the United Stated District Court for the Southern District of Ohio Eastern Division. The Company is evaluating the background facts at this time and is not able to predict the outcome of this lawsuit or whether it will have a material impact on the Company’s financial position, results of operations or cash flows.

On June 27, 2017, a complaint alleging negligence, as a result of a motor vehicle accident, was filed titled Donnelle Banks, individually and as parent and next Friend for Leila Ann Hollis, a minor, vs. Redback Coil Tubing LLC and Mammoth Energy Services, Inc. in the District Court of Gregg County, Texas. This matter is covered by insurance and did not have a material impact on the Company’s financial position, results of operations or cash flows.

On June 27, 2018, the Company's registered agent notified the Company that it had been served with a putative class action lawsuit titled Wendco of Puerto Rico Inc.; Multisystem Restaurant Inc.; Restaurant Operators Inc.; Apple Caribe, Inc.; on their own behalf and in representation of all businesses that conduct business in the Commonwealth of Puerto Rico vs. Mammoth Energy Services Inc.; Cobra Acquisitions, LLC; D. Grimm Puerto Rico, LLC; Aseguradoras A, B & C; John Doe; Richard Doe, in the Commonwealth of Puerto Rico Superior Court of San Juan. The plaintiffs allege negligent acts by the defendants caused an electrical failure in Puerto Rico resulting in damages of at least $300 million. The Company believes this claim is without merit and will vigorously defend the action. However, the Company continues to evaluate the background facts and at this time is not able to predict the outcome of this lawsuit or whether it will have a material impact on the Company's financial position, results of operations or cash flows.

The Company is involved in various other legal proceedings in the ordinary course of business. Although the Company cannot predict the outcome of these proceedings, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

Defined contribution plan

The Company sponsors a 401(k) defined contribution plan for the benefit of substantially all employees at their date of hire. The plan allows eligible employees to contribute up to 92% of their annual compensation, not to exceed annual limits established by the federal government. The Company makes discretionary matching contributions of up to 3% of an employee’s compensation and may make additional discretionary contributions for eligible employees. For the three and six months ended June 30, 2018, the Company paid $1.8 million and $3.4 million, respectively, in contributions to the plan. The Company did not make contributions to the plan during the three and six months ended June 30, 2017.

19. Reporting Segments

As of June 30, 2018, our revenues, income before income taxes and identifiable assets are primarily attributable to four reportable segments. The Company principally provides energy services in connection with on-shore drilling of oil and natural gas wells for small to large domestic independent oil and natural gas producers and electric infrastructure services to government-funded utilities, private utilities, public investor-owned utilities and co-operative utilities.

26

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The Company's Chief Executive Officer and Chief Financial Officer comprise the Company's Chief Operating Decision Maker function ("CODM"). Segment information is prepared on the same basis that the CODM manages the segments, evaluates the segment financial statements and makes key operating and resource utilization decisions. Segment evaluation is determined on a quantitative basis based on a function of operating income (loss), as well as a qualitative basis, such as nature of the product and service offerings and types of customers.

As of June 30, 2018, the Company’s four reportable segments include pressure pumping services ("Pressure Pumping"), infrastructure services ("Infrastructure"), natural sand proppant services ("Sand") and contract land and directional drilling services ("Drilling").

The pressure pumping services segment provides hydraulic fracturing services primarily in the Utica Shale of Eastern Ohio, Marcellus Shale in Pennsylvania, Permian Basin in Texas and the mid-continent region in Oklahoma. The infrastructure services segment provides electric utility infrastructure services to government-funded utilities, private utilities, public investor-owned utilities and co-operative utilities in Puerto Rico and the northeast, southwest and midwest portions of the United States. The sand segment mines, processes and sells sand for use in hydraulic fracturing. The sand segment primarily services the Utica Shale, Permian Basin, SCOOP, STACK and Montney Shale in British Columbia and Alberta, Canada. The contract land and directional drilling services segment provides vertical, horizontal and directional drilling services primarily in the Permian Basin in West Texas.

The Company also provides coil tubing services, pressure control services, flowback services, cementing services, equipment rental services, crude oil hauling services and remote accommodation services. The businesses that provide these services are distinct operating segments, which the CODM reviews independently when making key operating and resource utilization decisions. None of these operating segments meet the quantitative thresholds of a reporting segment and do not meet the aggregation criteria set forth in ASC 280 Segment Reporting. Therefore, results for these operating segments are included in the column labeled "All Other" in the tables below. Additionally, assets for corporate activities, which primarily include cash and cash equivalents, inter-segment accounts receivable, prepaid insurance and certain property and equipment, are included in the All Other column. Although Mammoth LLC, which holds these corporate assets, meets one of the quantitative thresholds of a reporting segment, it does not engage in business activities from which it may earn revenues and its results are not regularly reviewed by the Company's CODM when making key operating and resource utilization decisions. Therefore, the Company does not include it as a reportable segment.

Sales from one segment to another are generally priced at estimated equivalent commercial selling prices. Total revenue and Total cost of revenue amounts included in the Eliminations column in the following tables include inter-segment transactions conducted between segments. Receivables due for sales from one segment to another and for corporate allocations to each segment are included in the Eliminations column for Total assets in the following tables. All transactions conducted between segments are eliminated in consolidation. Transactions conducted by companies within the same reporting segment are eliminated within each reporting segment. The following tables set forth certain financial information with respect to the Company’s reportable segments (in thousands):

27

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Three months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	100,333		$	360,250	$	37,439	$	17,126		$	18,446		$	—		$	533,594
Intersegment revenues	1,073			—		15,406		84			1,721			(18,284		)	—
Total revenue	101,406			360,250		52,845		17,210			20,167			(18,284		)	533,594
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	61,593			210,189		35,117		15,280			17,649			—			339,828
Intersegment cost of revenues	16,174			754		1,019		(40		)	129			(18,036		)	—
Total cost of revenue	77,767			210,943		36,136		15,240			17,778			(18,036		)	339,828
Selling, general and administrative	20,822			39,786		1,787		1,591			1,141			—			65,127
Depreciation, depletion, amortization and accretion	13,829			4,094		3,881		5,349			3,642			—			30,795
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(11,012		)	105,427		11,041		(5,157		)	(2,394		)	(248		)	97,657
Interest expense, net	341			106		76		265			171			—			959
Other expense	80			330		36		32			8			—			486
Income (loss) before income taxes	$	(11,433	)	$	104,991	$	10,929	$	(5,454	)	$	(2,573	)	$	(248	)	$	96,212

Three months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	49,924	$	1,709		$	24,000		$	12,472		$	10,157		$	—		$	98,262
Intersegment revenues	272		—			762			—			85			(1,119		)	—
Total revenue	50,196		1,709			24,762			12,472			10,242			(1,119		)	98,262
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	35,826		1,626			19,974			12,033			7,881			—			77,340
Intersegment cost of revenues	847		—			267			—			5			(1,119		)	—
Total cost of revenue	36,673		1,626			20,241			12,033			7,886			(1,119		)	77,340
Selling, general and administrative	2,403		307			2,416			1,435			1,139			—			7,700
Depreciation, depletion, amortization and accretion	9,626		340			2,206			4,974			2,747			—			19,893
Operating income (loss)	1,494		(564		)	(101		)	(5,970		)	(1,530		)	—			(6,671		)
Interest expense, net	303		4			353			440			12			—			1,112
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	4		—			140			60			(1		)	—			203
Income (loss) before income taxes	$	1,187	$	(568	)	$	3,418		$	(6,470	)	$	(1,541	)	$	—		$	(3,974	)

Six months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	196,912		$	685,709	$	73,942	$	32,354		$	38,926		$	—		$	1,027,843
Intersegment revenues	5,632			—		29,918		86			4,136			(39,772		)	—
Total revenue	202,544			685,709		103,860		32,440			43,062			(39,772		)	1,027,843
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	128,205			404,265		68,447		29,755			35,257			—			665,929
Intersegment cost of revenues	31,576			2,545		5,305		122			234			(39,782		)	—
Total cost of revenue	159,781			406,810		73,752		29,877			35,491			(39,782		)	665,929
Selling, general and administrative	23,485			71,637		3,431		2,844			2,241			—			103,638
Depreciation, depletion, amortization and accretion	27,815			6,501		6,197		9,704			7,486			—			57,703
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(8,537		)	200,761		20,480		(10,172		)	(2,156		)	10			200,386
Interest expense, net	845			182		156		660			353			—			2,196
Other expense	92			332		23		72			(5		)	—			514
Income (loss) before income taxes	$	(9,474	)	$	200,247	$	20,301	$	(10,904	)	$	(2,504	)	$	10		$	197,676

28

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Six months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	90,377	$	1,709		$	38,912		$	23,223		$	19,007		$	—		$	173,228
Intersegment revenues	459		—			1,447			—			85			(1,991		)	—
Total revenue	90,836		1,709			40,359			23,223			19,092			(1,991		)	173,228
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	64,533		1,712			32,582			22,986			14,025			—			135,838
Intersegment cost of revenues	1,532		—			454			—			5			(1,991		)	—
Total cost of revenue	66,065		1,712			33,036			22,986			14,030			(1,991		)	135,838
Selling, general and administrative	4,180		355			4,474			2,728			2,700			—			14,437
Depreciation, depletion, amortization and accretion	18,784		340			3,569			9,942			4,495			—			37,130
Operating income (loss)	1,807		(698		)	(720		)	(12,433		)	(2,133		)	—			(14,177		)
Interest expense, net	431		4			486			657			(69		)	—			1,509
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	7		—			154			224			2			—			387
Income (loss) before income taxes	$	1,369	$	(702	)	$	2,652		$	(13,314	)	$	(2,066	)	$	—		$	(12,061	)

	Pressure Pumping		Infrastructure		Sand		Drilling		All Other		Eliminations			Total
As of June 30, 2018:
Total assets(a)	$	277,895	$	341,171	$	199,421	$	92,578	$	150,579	$	(32,521	)	$	1,029,123
Goodwill	$	86,043	$	891	$	2,684	$	—	$	11,893	$	—		$	101,511
As of December 31, 2017:
Total assets(a)	$	297,140	$	205,275	$	190,859	$	88,527	$	243,767	$	(158,325	)	$	867,243
Goodwill	$	86,043	$	891	$	2,684	$	—	$	10,193	$	—		$	99,811

a. Total assets included in the All Other column include Mammoth LLC corporate assets totaling $34.3 million and $148.8 million, respectively, as of June 30, 2018 and December 31, 2017, of which $16.9 million and $137.4 million are inter-segment accounts receivable which are eliminated in consolidation.

20. Subsequent Events

On July 9, 2018, the Company and certain of its direct and indirect subsidiaries entered into a third amendment to Mammoth's revolving credit facility with the lenders party thereto and PNC Bank, National Association, as a lender and agent for the lenders (the "Third Amendment"). Among other things, the Third Amendment permits (i) the declaration of quarterly cash distributions on the shares representing equity of Mammoth if, among other things, after giving effect to the payment of such dividend or distributions contemplated by the declaration, pro forma excess availability would be no less than 22.5% of the maximum available credit and no default or event of default exists, (ii) the payment of the declared dividends or distributions if (x) such dividends or distributions are made within sixty (60) days after the declaration thereof and (y) on the date such dividends or distributions are made, (1) after giving effect to the payment of such dividend or distribution, pro forma excess availability would be no less than 22.5% of the maximum available credit and (2) no material default or material event of default shall have occurred, or would result therefrom, and (iii) the issuance of third-party surety bonds in favor of Mammoth and its subsidiaries in relation with their bonded contracts, in each case subject to the additional limitations described in the Third Amendment.

On July 10, 2018, the Company's wholly owned subsidiary, Pressure Pumping and Gulfport entered into Amendment No. 2 to that certain Amended & Restated Master Services Agreement for Pressure Pumping Services, effective as of October 1, 2014, as amended effective January 1, 2016 (the “Existing Pressure Pumping Agreement”). Under the Existing Pressure Pumping Agreement, Pressure Pumping provides hydraulic fracturing, stimulation and related completion and rework services to Gulfport with two dedicated frac spreads and related equipment. The amendment extended the term of the existing pressure pumping agreement until December 31, 2021, unless it is terminated earlier in accordance with its terms, and expanded the service area to include both Ohio and Oklahoma. The amendment also provides that Gulfport has the right to suspend pressure pumping services for up to one crew by upon a minimum of 90 days prior written notice to Pressure Pumping, with no further payment or other obligation to Pressure Pumping for such suspended crew. Pressure Pumping will be obligated to resume any such suspended pressure pumping services upon 90 days prior written notice by

29

MAMMOTH ENERGY SERVICES, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Gulfport, unless such notice is waived by Pressure Pumping. The amendment also provides for the initial suspension of pressure pumping services to Gulfport for a period July 1, 2018 through September 30, 2018, during which period Pressure Pumping may use the dedicated frac spreads for other customers. If during the initial suspension period Pressure Pumping’s use of the dedicated frac spreads for other customers does not reach a certain level, then Gulfport will pay agreed costs to Pressure Pumping and Pressure Pumping will perform services for Gulfport with respect to such amount. In addition, if during such initial suspension period Pressure Pumping is unable to utilize the dedicated frac spreads for other customers, Gulfport will pay agreed recoupment costs to Pressure Pumping during the period of October 1, 2018 to December 31, 2018.

On August 6, 2018, the Company's wholly owned subsidiary, Muskie Proppant LLC ("Muskie Proppant") and Gulfport entered into a Second Amendment to the Sand Supply Agreement, effective as of October 1, 2014, as amended effective November 15, 2015. The amendment extends the term of the agreement until December 31, 2021.

The Company's unsatisfied performance obligations increased approximately $88.8 million as a result of the amendments to the pressure pumping and sand supply agreements with Gulfport.

On July 16, 2018, the Company's Board of Directors initiated a quarterly dividend policy and declared the Company's first quarterly cash dividend of $0.125 per share of common stock, to be paid on August 14, 2018 to stockholders of record as of the close of business on August 7, 2018. Based on the number of shares outstanding at June 30, 2018, the total dividend payable to stockholders on August 14, 2018 will be approximately $5.6 million.

Subsequent to June 30, 2018, the Company entered into rail car and property lease agreements with aggregate commitments of $2.4 million.

Subsequent to June 30, 2018, the Company ordered additional capital equipment with aggregate commitments of $9.6 million.

Subsequent to June 30, 2018, subsidiaries in the Company's infrastructure segment entered into an air chart agreement, barge chartering agreement and other service agreements with aggregate commitments of $2.5 million, $2.1 million and $0.6 million, respectively.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion should be read in conjunction with the unaudited condensed consolidated financial statements and related notes thereto presented in this Quarterly Report and the consolidated financial statements and related notes thereto included in our Annual Report on Form 10-K. This discussion contains forward-looking statements reflecting our current expectations, estimates and assumptions concerning events and financial trends that may affect our future operating results or financial position. Actual results and the timing of events may differ materially from those contained in these forward-looking statements due to a number of factors, including those discussed in Item 1A. "Risk Factors” in this Quarterly Report and in our Form 10-K for the year ended December 31, 2017, filed with the Securities and Exchange Commission, or the SEC, on February 28, 2018 and the section entitled “Forward-Looking Statements” appearing elsewhere in this Quarterly Report.

Overview

We are an integrated, growth-oriented company serving both the oil and gas and the electric utility industry in North America and US territories. Our primary business objective is to grow our operations and create value for stockholders through organic opportunities and accretive acquisitions. Our suite of services includes pressure pumping services, infrastructure services, natural sand proppant services, contract land and directional drilling services and other energy services, including coil tubing, flowback, cementing, acidizing, equipment rental, crude oil hauling, water transfer and remote accommodations. Our pressure pumping services division provides hydraulic fracturing services. Our infrastructure services division provides construction, upgrade, maintenance and repair services to the electrical infrastructure industry. Our natural sand proppant services division mines, processes and sells proppant used for hydraulic fracturing. Our contract land and directional drilling services division provides drilling rigs and crews for operators as well as rental equipment, such as mud motors and operational tools, for both vertical and horizontal drilling. In addition to these service divisions, we also provide coil tubing services, pressure control services, flowback services, cementing services, acidizing services, equipment rentals, crude oil hauling services, water transfer and remote accommodations. We believe that the services we offer play a critical role in increasing the ultimate recovery and present value of production streams from unconventional resources as well as maintaining and improving electrical infrastructure. Our complementary suite of services provides us with the opportunity to cross-sell our services and expand our customer base and geographic positioning.

On November 24, 2014, Mammoth Energy Holdings LLC, or Mammoth Holdings, Gulfport Energy Corporation, or Gulfport, and Rhino Exploration LLC, or Rhino, contributed to Mammoth Energy Partners LP, or the Partnership, their respective interests in the following entities: Bison Drilling and Field Services, LLC, or Bison Drilling; Bison Trucking LLC, or Bison Trucking; White Wing Tubular Services LLC, or White Wing; Barracuda Logistics LLC, or Barracuda; Panther Drilling Systems LLC, or Panther Drilling; Redback Energy Services LLC, or Redback Energy Services; Redback Coil Tubing LLC, or Redback Coil Tubing; Muskie Proppant LLC, or Muskie Proppant; Stingray Pressure Pumping LLC, or Pressure Pumping; Stingray Logistics LLC, or Logistics; and Great White Sand Tiger Lodging Ltd., or Lodging. Upon completion of these contributions, Mammoth Holdings, Gulfport and Rhino beneficially owned a 68.7%, 30.5% and 0.8% equity interest, respectively, in the Partnership.

On October 12, 2016, prior to and in connection with the IPO, the Partnership converted to a Delaware limited liability company named Mammoth Energy Partners LLC, or Mammoth LLC, and Mammoth Holdings, Gulfport and Rhino contributed their respective membership interests in Mammoth LLC to us in exchange for shares of our common stock, and Mammoth LLC became our wholly-owned subsidiary.

On October 19, 2016, we closed our IPO of 7,750,000 shares of common stock, of which 7,500,000 shares were sold by us and the remaining 250,000 shares were sold by certain selling stockholders, at a price to the public of $15.00 per share. Our common stock is traded on the Nasdaq Global Select Market under the symbol “TUSK.” Unless the context otherwise requires, references in this report to “we,” “our,” “us,” or like terms, when used in a historical context for periods prior to October 12, 2016 refer to the Partnership and its subsidiaries. References in this report to “we,” “our,” “us,” or like terms, when used in the present tense or for periods commencing on or after October 12, 2016 refer to Mammoth Energy Services, Inc., or Mammoth Inc., and its subsidiaries. Mammoth Inc. was formed in June 2016, and did not conduct any material business operations prior to the completion of the IPO and the contribution described above completed on October 12, 2016 immediately prior to the IPO. Prior to the IPO, Mammoth Inc. was a wholly-owned subsidiary of the Partnership.

On June 5, 2017, we acquired Sturgeon Acquisitions LLC, or Sturgeon, and Sturgeon's wholly owned subsidiaries Taylor Frac, LLC, Taylor Real Estate Investments, LLC and South River Road, LLC. Prior to the acquisition, we and Sturgeon were under common control and, in accordance with generally accepted accounting principles in the United States, or GAAP, we have accounted for this acquisition in a manner similar to the pooling of interest method of accounting. Therefore, our

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historical financial information for all periods included in this Quarterly Report on Form 10-Q has been recast to combine Sturgeon's financial results with our financial results as if the acquisition had been effective since Sturgeon commenced operations.

Second Quarter 2018 Highlights and Recent Developments

Executed New $900 million Contract with PREPA

On May 26, 2018, our wholly owned subsidiary Cobra Acquisitions LLC, or Cobra, entered into a new master services agreement with the Puerto Rico Electric Power Authority, or PREPA, to complete the restoration of the electrical transmission and distribution system components damaged by Hurricane Maria and to support the initial phase of reconstruction of the electrical power system in Puerto Rico, which we refer to as the New PREPA Contract. Cobra has agreed to provide the labor, supervision, tools and materials necessary to provide the restoration and reconstruction services under the New PREPA Contract, which has a one-year term ending May 25, 2019 and provides for total payments not to exceed $900.0 million. The New PREPA Contract was awarded at the conclusion of a request for proposal (RFP) bid process that began in February 2018. The New PREPA Contract is in addition to the contract that Cobra entered into in October 2017, as subsequently amended, to provide restoration services to PREPA.

Acquisition of WTL Oil and RTS Energy Services

During the second quarter of 2018, we completed the acquisitions of WTL Oil LLC, or WTL, and RTS Energy Services LLC, or RTS, for $6.1 million and $8.1 million, respectively. WTL provides crude oil hauling services in the Permian Basin and mid-continent region. RTS provides cementing and acidizing services in the Permian Basin.

Completed Underwritten Secondary Offering of Common Stock

On June 29, 2018, Gulfport and certain entities controlled by Wexford Capital LP, as the selling stockholders, completed an underwritten secondary public offering of 4,000,000 shares of the Company’s common stock at a purchase price to the selling stockholders of $38.01 per share. The selling stockholders received all proceeds from this offering. The selling stockholders also granted the underwriters an option to purchase up to an aggregate of 600,000 additional shares of our common stock at the same purchase price. This option was exercised, in part, and on July 30, 2018, the underwriters purchased an additional 385,000 shares of common stock from the selling stockholders at the same price per share.

Extended Pressure Pumping Services and Sand Supply Agreements with Gulfport

On July 10, 2018, we amended our existing agreement with Gulfport pursuant to which we, through our subsidiary Pressure Pumping, provide hydraulic fracturing, stimulation and related completion and rework services to Gulfport with two dedicated frac spreads and related equipment. The amendment extended the term of the existing pressure pumping agreement until December 31, 2021, unless it is terminated earlier in accordance with its terms, and expanded the service area to include both Ohio and Oklahoma. The pressure pumping amendment also provides that Gulfport has the right to suspend pressure pumping services for up to one crew by upon a minimum of 90 days prior written notice to Pressure Pumping, with no further payment or other obligation to Pressure Pumping for such suspended crew. Pressure Pumping will be obligated to resume any such suspended pressure pumping services upon 90 days prior written notice by Gulfport, unless such notice is waived by Pressure Pumping.

The pressure pumping amendment also provides for the initial suspension of pressure pumping services to Gulfport for a period July 1, 2018 through September 30, 2018, during which period Pressure Pumping may use the dedicated frac spreads for other customers. If during the initial suspension period Pressure Pumping’s use of the dedicated frac spreads for other customers does not reach a certain level, then Gulfport will pay agreed costs to Pressure Pumping and Pressure Pumping will perform services for Gulfport with respect to such amount. In addition, if during such initial suspension period Pressure Pumping is unable to utilize the dedicated frac spreads for other customers, Gulfport will pay agreed recoupment costs to Pressure Pumping during the period of October 1, 2018 to December 31, 2018.

On August 6, 2018, we amended our existing agreement with Gulfport pursuant to which we, through our subsidiary Muskie Proppant, sell and deliver specified amounts of sand to Gulfport. The amendment extends the term of the existing sand supply agreement until December 31, 2021.

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Industry Overview

Oil and Natural Gas Industry 

The oil and natural gas industry has traditionally been volatile and is influenced by a combination of long-term, short-term and cyclical trends, including the domestic and international supply and demand for oil and natural gas, current and expected future prices for oil and natural gas and the perceived stability and sustainability of those prices, production depletion rates and the resultant levels of cash flows generated and allocated by exploration and production companies to their drilling, completion and related services and products budget. The oil and natural gas industry is also impacted by general domestic and international economic conditions, political instability in oil producing countries, government regulations (both in the United States and elsewhere), levels of customer demand, the availability of pipeline capacity and other conditions and factors that are beyond our control.

Demand for most of our oil and natural gas products and services depends substantially on the level of expenditures by companies in the oil and natural gas industry. The levels of capital expenditures of our customers are predominantly driven by the oil and natural gas prices. Over the past several years, commodity prices, particularly oil, has seen significant volatility with pricing ranging from a high of $110.53 per barrel on September 6, 2013 to a low of $26.19 per barrel on February 11, 2016. During early 2017, oil prices stabilized around the $50 per barrel level and started a gradual upward trend which continued into the second quarter of 2018, where oil prices averaged $67.85.

We anticipate demand for our oil and natural gas services and products will continue to be dependent on commodity prices. If commodity prices stabilize at current levels or continue to increase, we expect to experience further increases in demand for our services and products, particularly in our completion and production, natural sand proppant and contract land and directional drilling businesses. Decreases in commodity prices, however, may result in a reduction in the demand for our drilling, completion and other products and services.

Energy Infrastructure Industry

In 2017, we expanded into the electric infrastructure business, offering both commercial and storm restoration services to government-funded utilities, private utilities, public investor owned utilities and cooperatives. Since we commenced operations in this line of business, substantially all of our infrastructure revenues has been generated from storm restoration work, primarily from PREPA due to damage caused by Hurricane Maria. On October 19, 2017, Cobra and PREPA entered into an emergency master services agreement for repairs to PREPA’s electrical grid. The one-year contract, as amended, provides for payments of up to $945.4 million. On May 26, 2018, Cobra and PREPA entered into a new one-year, $900.0 million master services agreement to provide additional repair services and begin the initial phase of reconstruction of the electrical power system in Puerto Rico. PREPA is currently subject to bankruptcy proceedings pending in the U.S. District Court for the District of Puerto Rico. As a result, PREPA's ability to meet its payment obligations under the contract will be largely dependent upon funding from the Federal Emergency Management Agency or other sources. In the event PREPA does not have or does not obtain the funds necessary to satisfy its obligations to Cobra under the contracts, terminates the contracts or curtails our services prior to the end of the contract terms, our financial condition, results of operations and cash flows could be materially and adversely affected. In addition, government contracts are subject to various uncertainties, restrictions and regulations, including oversight audits by government representatives and profit and cost controls, which could result in withholding or delayed payments to us or efforts to recover payments already made.

The demand for our infrastructure services in the continental United States has steadily increased since we expanded in to the infrastructure business. Our infrastructure teams are working for multiple utilities across the northeastern, midwestern and southwestern portions of the United States. We believe we will be able to continue to grow our customer base in the continental United States and increase the backlog of work over the coming years.

Natural Sand Proppant Industry

In the natural sand proppant industry, demand growth for frac sand and other proppants is primarily driven by advancements in oil and natural gas drilling and well completion technology and techniques, such as horizontal drilling and hydraulic fracturing, as well as overall industry activity growth. Demand for proppant declined in 2015 and throughout most of 2016 with reduced well completion activity; however, we believe that demand for proppant will continue to grow over the long-term, as it did throughout 2017 and the first half of 2018. Over the past 18 months, several new and existing suppliers announced planned capacity additions of frac sand supply, particularly in the Permian Basin. We expect frac sand supply to exceed growth in demand over the coming months and quarters in the Permian Basin. While planned capacity may exceed the expectations for frac sand demand in the Permian Basin, the collectively available industry capacity is constrained due to (i)

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availability of the grades of sand that are currently in demand, (ii) general operating conditions and normal downtime and (iii) logistics constraints. The industry is expected to add significant capacity over the next 12 to 18 months, particularly in the Permian Basin. We believe that the coarseness, conductivity, sphericity, acid-solubility and crush-resistant properties of our Northern White sand reserves and our transportation infrastructure afford us an advantage over many of our competitors and make us one of a select group of sand producers capable of delivering high volumes of frac sand that is optimal for oil and natural gas production to all major unconventional resource basins currently producing throughout North America.

During the first half of 2018, constraints in the rail system adversely impacted frac sand deliveries from our Taylor sand facility in Jackson County, Wisconsin. As a result, we estimate production at our Taylor facility was 23% lower during the first half of 2018 than it would have been in the absence of these constraints. We anticipate that these rail system constraints will be alleviated later in 2018. Production at our Piranha facility was not impacted by these rail constraints.

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Results of Operations

Three Months Ended June 30, 2018 Compared to Three Months Ended June 30, 2017

	Three Months Ended
	June 30, 2018			June 30, 2017
	(in thousands)
Revenue:
Pressure pumping services	$	101,406		$	50,196
Infrastructure services	360,250			1,709
Natural sand proppant services	52,845			24,762
Contract land and directional drilling services	17,210			12,472
Other services	20,167			10,242
Eliminations	(18,284		)	(1,119		)
Total revenue	533,594			98,262
Cost of revenue:
Pressure pumping services (exclusive of depreciation and amortization of $13,841 and $9,597, respectively, for the three months ended June 30, 2018 and 2017)	77,767			36,673
Infrastructure services (exclusive of depreciation and amortization of $4,088 and $340, respectively, for the three months ended June 30, 2018 and 2017)	210,943			1,626
Natural sand proppant services (exclusive of depreciation, depletion and accretion of $3,879 and $2,204, respectively, for the three months ended June 30, 2018 and 2017)	36,136			20,241
Contract land and directional drilling services (exclusive of depreciation of $5,349 and $4,970, respectively, for the three months ended June 30, 2018 and 2017)	15,240			12,033
Other services (exclusive of depreciation and amortization of $3,620 and $2,744, respectively, for the three months ended June 30, 2018 and 2017)	17,778			7,886
Eliminations	(18,036		)	(1,119		)
Total cost of revenue	339,828			77,340
Selling, general and administrative expenses	65,127			7,700
Depreciation, depletion, amortization and accretion	30,795			19,893
Impairment of long-lived assets	187			—
Operating income (loss)	97,657			(6,671		)
Interest expense, net	(959		)	(1,112		)
Bargain purchase gain	—			4,012
Other expense, net	(486		)	(203		)
Income (loss) before income taxes	96,212			(3,974		)
Provision (benefit) for income taxes	53,512			(2,804		)
Net income (loss)	$	42,700		$	(1,170	)

Revenue. Revenue for the three months ended June 30, 2018 increased $436 million, or 443%, to $534 million from $98 million for the three months ended June 30, 2017. The increase in total revenues is primarily attributable to a $359 million increase in infrastructure services revenue during the three months ended June 30, 2018, representing 82% of the overall increase. Additionally, pressure pumping services revenue and natural sand proppant revenue increased $51 million and $28 million, respectively, representing 12% and 6% of the overall increase.

Revenue derived from related parties was $50 million, or 9% of our total revenues, for the three months ended June 30, 2018 and $58 million, or 59% of our total revenues, for the three months ended June 30, 2017. Substantially all of our related party revenue is derived from Gulfport under pressure pumping and sand contracts. On July 10, 2018, we executed an

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amendment with Gulfport to extend the term of our pressure pumping contract through December 2021. While the terms of the contract amendment provide Gulfport the right to suspend our services under certain conditions, we do not believe that any such suspension would have a material adverse effect on our operations or financial condition based on current utilization and pricing. Additionally, on August 6, 2018, we executed an amendment with Gulfport to extend the term of our sand supply agreement through December 2021. Revenue by operating division was as follows:

Pressure Pumping Services. Pressure pumping services division revenue increased $51 million, or 102%, to $101 million for the three months ended June 30, 2018 from $50 million for the three months ended June 30, 2017. Revenue derived from related parties was $34 million, or 33% of total pressure pumping revenues, for the three months ended June 30, 2018 compared to $41 million, or 82% of total pressure pumping revenues, for the three months ended June 30, 2017. Substantially all of our related party revenue is derived from Gulfport. Inter-segment revenues, consisting primarily of revenue derived from our sand segment, totaled $1 million and $0.3 million, respectively, for the three months ended June 30, 2018 and 2017.

The increase in our pressure pumping services revenue was primarily driven by the startup of our fourth, fifth and sixth pressure pumping fleets in June, August and October 2017, respectively, in the SCOOP/STACK and Permian Basin, which contributed revenues of $51 million during the three months ended June 30, 2018. Additionally, the number of stages completed increased to 1,815 for the three months ended June 30, 2018 from 1,287 for the three months ended June 30, 2017.

Infrastructure Services. Infrastructure services division revenue increased $358 million to $360 million for the three months ended June 30, 2018 from $2 million for the three months ended June 30, 2017. We generated $347 million, or 96% of total infrastructure services revenue, from our contract with PREPA for repairs to Puerto Rico's electrical grid as a result of Hurricane Maria. For additional information regarding our contracts with PREPA and our infrastructure services, see "Industry Overview - Electrical Infrastructure Industry" above.

Natural Sand Proppant Services. Natural sand proppant services division revenue increased $28 million, or 113%, to $53 million for the three months ended June 30, 2018, from $25 million for the three months ended June 30, 2017. Revenue derived from related parties was $10 million, or 18% of total sand revenues, for the three months ended June 30, 2018 and $14 million, or 55% of total sand revenues, for the three months ended June 30, 2017. Inter-segment revenues, consisting primarily of revenue derived from our pressure pumping segment, totaled $15 million, or 29% of total sand revenues, for the three months ended June 30, 2018 and $1 million, or 3% of total sand revenues, for the three months ended June 30, 2017.

The increase in our natural sand proppant services revenue was primarily attributable to a 117% increase in tons of sand sold from approximately 359,053 tons for the three months ended June 30, 2017 to 777,850 tons for the three months ended June 30, 2018. We completed the expansion of our Taylor sand facility in March 2018. In May 2017, we acquired a wet and dry plant and sand mine located on approximately 600 acres in New Auburn, Wisconsin through our purchase of the assets of Chieftain. These assets contributed revenues of $14.6 million to our natural sand proppant division for the three months ended June 30, 2018 compared to $0.2 million for the three months ended June 30, 2017.

Contract Land and Directional Drilling Services. Contract land and directional drilling services division revenue increased $5 million, or 38%, from $12 million for the three months ended June 30, 2017 to $17 million for the three months ended June 30, 2018. Revenue derived from related parties, consisting primarily of directional drilling revenue from Gulfport, was a nominal amount for the three months ended June 30, 2018 and $1 million, or 8% of total drilling revenues, for the three months ended June 30, 2017.

The increase in contract land and directional drilling revenue was primarily attributable to our directional drilling services, which accounted for $4 million, or 76% of the total increase as a result of increased utilization from 26% for the three months ended June 30, 2017 to 47% for the three months ended June 30, 2018. Our rig moving services accounted for $1 million, or 22%, of the operating division increase primarily due to increased activity. Our land drilling services accounted for $0.1 million, or 2%, of the operating division increase as a result of an increase in average day rates from approximately $14,100 for the three months ended June 30, 2017 to approximately $17,229 for the three months ended June 30, 2018, partially offset by a decrease in average active rigs from six for the three months ended June 30, 2017 to four for the three months ended June 30, 2018.

Other Services. Other revenue, consisting of revenue derived from our coil tubing, pressure control, flowback, cementing, acidizing, equipment rental, crude oil hauling and remote accommodation businesses, increased

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$10 million, or 97%, to $20 million for the three months ended June 30, 2018 from $10 million for the three months ended June 30, 2017. Revenue derived from related parties, consisting primarily of equipment rental and cementing revenue from Gulfport, was $7 million, or 34% of total other revenues, for the three months ended June 30, 2018 and $3 million, or 25% of total other revenues, for the three months ended June 30, 2017. Inter-segment revenues, consisting primarily of revenue derived from our infrastructure and pressure pumping segments, totaled $2 million and $0.1 million, respectively, for the three months ended June 30, 2018 and 2017.

Stingray Cementing and Stingray Energy, which we acquired in June 2017, contributed revenues of $9 million for the three months ended June 30, 2018 compared to $3 million for the three months ended June 30, 2017. Revenues from our coil tubing, pressure control and flowback services increased $3 million for the three months ended June 30, 2018 compared to three months ended June 30, 2017 primarily due to increases in utilization. These increases were partially offset by a decrease in revenue from our remote accommodations business due to a decline in utilization.

Cost of Revenue (exclusive of depreciation, depletion, amortization and accretion expense). Cost of revenue, exclusive of depreciation, depletion, amortization and accretion expense, increased $263 million from $77 million, or 79% of total revenue, for the three months ended June 30, 2017 to $340 million, or 64%of total revenue, for the three months ended June 30, 2018. The increase was primarily due to an expansion of our infrastructure services business, which represented a $209 million increase in cost of revenue, as well as an increase in pressure pumping division costs of $41 million, primarily related to the addition of three new fleets in 2017, and an increase in natural sand proppant division costs of $16 million, primarily due to an increase in tons of sand sold during the three months ended June 30, 2018 compared to the three months ended June 30, 2017. Cost of revenue by operating division was as follows:

Pressure Pumping Services. Pressure pumping services division cost of revenue, exclusive of depreciation and amortization expense, increased $41 million, or 112%, to $78 million for the three months ended June 30, 2018 from $37 million for the three months ended June 30, 2017. The increase was primarily due to the expansion of services into the SCOOP/STACK and Permian Basin with the addition of three fleets. As a percentage of revenue, our pressure pumping services division cost of revenue, exclusive of depreciation and amortization expense of $14 million and $10 million for the three months ended June 30, 2018 and 2017, was 77% and 73%, respectively, for the three months ended June 30, 2018 and 2017. The increase in costs as a percentage of revenue was primarily due to an increase in cost of goods sold as a result of selling sand with our service package to customers in the mid-continent region.

Infrastructure Services. Infrastructure services division cost of revenue, exclusive of depreciation and amortization expense, was $211 million and $2 million, respectively, for the three months ended June 30, 2018 and 2017. The increase is due to the expansion of our infrastructure business in late 2017 and 2018. The largest components of our cost of revenue include labor-related costs, including contract labor, and travel, meals and lodging expense. As a percentage of revenue, cost of revenue, exclusive of depreciation and amortization expense of $4 million and $0.3 million for the three months ended June 30, 2018 and 2017, was 59% and 95%, respectively, for the three months ended June 30, 2018 and 2017.

Natural Sand Proppant Services. Natural sand proppant services division cost of revenue, exclusive of depreciation, depletion and accretion expense, increased $16 million, or 79%, from $20 million for the three months ended June 30, 2017 to $36 million for the three months ended June 30, 2018, primarily due to an increase in cost of goods sold as a result of a 117% increase in tons of sand sold in the 2018 period. As a percentage of revenue, cost of revenue, exclusive of depreciation, depletion and accretion expense of $4 million and $2 million for the three months ended June 30, 2018 and 2017, was 68% and 82%, respectively, for the three months ended June 30, 2018 and 2017. The decrease is primarily due to startup costs incurred for our Piranha plant, which was acquired in May 2017.

Contract Land and Directional Drilling Services. Contract land and directional drilling services division cost of revenue, exclusive of depreciation expense, increased $3 million, or 27%, from $12 million for the three months ended June 30, 2017 to $15 million for the three months ended June 30, 2018, primarily due to an increase in utilization. As a percentage of revenue, our contract land and directional drilling services division cost of revenue, exclusive of depreciation expense of $5 million for both the three months ended June 30, 2018 and 2017, was 89% and 96%, respectively, for the three months ended June 30, 2018 and June 30, 2017. The decrease was primarily due to increased utilization and dayrates.

Other Services. Other services division cost of revenue, exclusive of depreciation and amortization expense, increased $10 million, or 125%, from $8 million for the three months ended June 30, 2017 to $18 million for the three

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months ended June 30, 2018, primarily due to the acquisition of Stingray Cementing and Stingray Energy in June 2017 and an increase in utilization for our other businesses. As a percentage of revenue, cost of revenue, exclusive of depreciation and amortization expense of $4 million and $2 million for the three months ended June 30, 2018 and 2017, was 88% and 77%, respectively, for the three months ended June 30, 2018 and 2017. The increase is primarily the result of increased equipment rental expense and labor-related costs as a percentage of revenue.

Selling, General and Administrative Expenses. Selling, general and administrative expenses, or SG&A, represent the costs associated with managing and supporting our operations. These expenses increased $57 million, or 746%, to $65 million for the three months ended June 30, 2018, from $8 million for the three months ended June 30, 2017, primarily related to costs incurred for the expansion of our infrastructure business, an increase in the provision for bad debt and an increase in equity based compensation. The equity based compensation represents compensation expense for awards issued by certain Wexford affiliates and had no cash impact to the Company and no dilutive impact relative to the number of shares outstanding. Following is a breakout of SG&A expenses for the periods indicated (in thousands):

	Three Months Ended
	June 30, 2018		June 30, 2017
Cash expenses:
Compensation and benefits	$	10,978	$	2,966
Professional services	2,981		1,652
Other(a)	3,935		2,015
Total cash SG&A expense	17,894		6,633
Non-cash expenses:
Bad debt provision	28,263		17
Equity based compensation(b)	17,487		—
Stock based compensation	1,483		1,050
Total non-cash SG&A expense	47,233		1,067
Total SG&A expense	$	65,127	$	7,700

a. Includes travel-related costs, IT expenses, rent, utilities and other general and administrative-related costs.

b. Represents compensation expense for non-employee awards, which were issued and are payable by certain affiliates of Wexford (the sponsor level).

Depreciation, Depletion, Amortization and Accretion. Depreciation, depletion, amortization and accretion increased $11 million, or 55%, to $31 million for the three months ended June 30, 2018 from $20 million for the three months ended June 30, 2017. The increase is primarily attributable to an increase in property and equipment purchases in the second half of 2017 and first half of 2018, resulting in increased depreciation expense.

Operating Income (Loss). Operating income increased $105 million to $98 million for the three months ended June 30, 2018 compared to an operating loss of $7 million for the three months ended June 30, 2017. The increase was primarily the result of an expansion of our infrastructure services business, which recognized operating income of $106 million and an increase in natural sand proppant operating income of $11 million. These were partially offset by a $13 million decrease in operating income in our pressure pumping segment due to an increase in non-cash equity compensation expense during the three months ended June 30, 2018.

Interest Expense, Net. Interest expense, net was $1 million for both the three months ended June 30, 2018 and 2017. Average outstanding borrowings remained relatively flat for the three months ended June 30, 2018 compared to the three months ended June 30, 2017.

Other Expense, Net. Non-operating charges, net resulted in expense of $0.5 million and $0.2 million, respectively, for the three months ended June 30, 2018 and 2017. Both periods were primarily comprised of loss recognition on assets disposed of during the period.

Income Taxes. We recorded income tax expense of $54 million on pre-tax income of $96 million for the three months ended June 30, 2018 compared to an income tax benefit of $3 million on pre-tax loss of $4 million for the three months ended June 30, 2017. Our effective tax rate was 56% for the three months ended June 30, 2018 compared to 35% for the three months ended June 30, 2017. The increase in effective tax rate is primarily due to the equity based compensation expense recognized during the three months ending June 30, 2018 as well as a higher tax rate in Puerto Rico, where most of our income was

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generated during the three months ended June 30, 2018, compared to the United States tax rate. No income was generated in Puerto Rico during the three months ended June 30, 2017.

Results of Operations

Six Months Ended June 30, 2018 Compared to Six Months Ended June 30, 2017

	Six Months Ended
	June 30, 2018			June 30, 2017
	(in thousands)
Revenue:
Pressure pumping services	$	202,544		$	90,836
Infrastructure services	685,709			1,709
Natural sand proppant services	103,860			40,359
Contract land and directional drilling services	32,440			23,223
Other services	43,062			19,092
Eliminations	(39,772		)	(1,991		)
Total revenue	1,027,843			173,228
Cost of revenue:
Pressure pumping services (exclusive of depreciation and amortization of $27,818 and $18,725, respectively, for the six months ended June 30, 2018 and 2017)	159,781			66,065
Infrastructure services (exclusive of depreciation and amortization of $6,489 and $340, respectively, for the six months ended June 30, 2018 and 2017)	406,810			1,712
Natural sand proppant services (exclusive of depreciation, depletion and accretion of $6,193 and $3,566, respectively, for the six months ended June 30, 2018 and 2017)	73,752			33,036
Contract land and directional drilling services (exclusive of depreciation of $9,703 and $9,934, respectively, for the six months ended June 30, 2018 and 2017)	29,877			22,986
Other services (exclusive of depreciation and amortization of $7,463 and $4,490, respectively, for the six months ended June 30, 2018 and 2017)	35,491			14,030
Eliminations	(39,782		)	(1,991		)
Total cost of revenue	665,929			135,838
Selling, general and administrative expenses	103,638			14,437
Depreciation, depletion, amortization and accretion	57,703			37,130
Impairment of long-lived assets	187			—
Operating income (loss)	200,386			(14,177		)
Interest expense, net	(2,196		)	(1,509		)
Bargain purchase gain	—			4,012
Other expense, net	(514		)	(387		)
Income (loss) before income taxes	197,676			(12,061		)
Provision (benefit) for income taxes	99,430			(5,910		)
Net income (loss)	$	98,246		$	(6,151	)

Revenue. Revenue for the six months ended June 30, 2018 increased $855 million, or 493%, to $1 billion from $173 million for the six months ended June 30, 2017. The increase in total revenues is primarily attributable to a $684 million increase in infrastructure services revenue, representing 80% of the overall increase. Additionally, pressure pumping services revenue and natural sand proppant revenue increased $112 million and $64 million, respectively, representing 13% and 7% of the overall increase.

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Revenue derived from related parties was $111 million, or 11% of our total revenues, for the six months ended June 30, 2018 and $103 million, or 59% of our total revenues, for the six months ended June 30, 2017. Substantially all of our related party revenue is derived from Gulfport under pressure pumping and sand contracts. On July 10, 2018, we executed an amendment with Gulfport to extend the term of our pressure pumping contract through December 2021. While the terms of the contract amendment provide Gulfport the right to suspend our services under certain conditions, we do not believe that any such suspension would have a material adverse effect on our operations or financial condition based on current utilization and pricing. Additionally, on August 6, 2018, we executed an amendment with Gulfport to extend the term of our sand supply agreement through December 2021. Revenue by operating division was as follows:

Pressure Pumping Services. Pressure pumping services division revenue increased $112 million, or 123%, to $203 million for the six months ended June 30, 2018 from $91 million for the six months ended June 30, 2017. Revenue derived from related parties was $72 million, or 36% of total pressure pumping revenues, for the six months ended June 30, 2018 compared to $73 million, or 80% of total pressure pumping revenues, for the six months ended June 30, 2017. Substantially all of our related party revenue is derived from Gulfport. Inter-segment revenues, consisting primarily of revenue derived from our sand segment, totaled $6 million and $0 million, respectively, for the six months ended June 30, 2018 and 2017.

The increase in our pressure pumping services revenue was primarily driven by the startup of our fourth, fifth and sixth pressure pumping fleets in June, August and October 2017, respectively, in the SCOOP/STACK and Permian Basin, which contributed revenues of $92 million during the six months ended June 30, 2018. Additionally, the number of stages completed increased to 3,487 for the six months ended June 30, 2018 from 2,147 for the six months ended June 30, 2017.

Infrastructure Services. Infrastructure services division revenue increased $684 million from $2 million for the six months ended June 30, 2017 to $686 million for the six months ended June 30, 2018. We generated $665 million, or 97% of total infrastructure services revenue, from our contract with PREPA for repairs to Puerto Rico's electrical grid as a result of Hurricane Maria. For additional information regarding our contracts with PREPA and our infrastructure services, see "Industry Overview - Electrical Infrastructure Industry" above.

Natural Sand Proppant Services. Natural sand proppant services division revenue increased $64 million, or 157%, to $104 million for the six months ended June 30, 2018, from $40 million for the six months ended June 30, 2017. Revenue derived from related parties was $21 million, or 20% of total sand revenues, for the six months ended June 30, 2018 and $25 million, or 62% of total sand revenues, for the six months ended June 30, 2017. Inter-segment revenues, consisting primarily of revenue derived from our pressure pumping segment, totaled $30 million, or 29% of total sand revenues, for the six months ended June 30, 2018 and $1 million, or 4% of total sand revenues, for the six months ended June 30, 2017.

The increase in our natural sand proppant services revenue was primarily attributable to a 146% increase in tons of sand sold from approximately 614,918 tons for the six months ended June 30, 2017 to 1,513,434 tons for the six months ended June 30, 2018. We completed the expansion of our Taylor sand facility in March 2018. In May 2017, we acquired a wet and dry plant and sand mine located on approximately 600 acres in New Auburn, Wisconsin through our purchase of the assets of Chieftain. These assets contributed revenues of $26 million to our natural sand proppant division for the six months ended June 30, 2018 compared to $0.2 million for the six months ended June 30, 2017.

Contract Land and Directional Drilling Services. Contract land and directional drilling services division revenue increased $9 million, or 40%, from $23 million for the six months ended June 30, 2017 to $32 million for the six months ended June 30, 2018. Revenue derived from related parties, consisting primarily of directional drilling revenue from Gulfport and El Toro Resources LLC, was $0.4 million, or 1% of total drilling revenues, for the six months ended June 30, 2018 compared to $2 million, or 9% of total drilling revenues, for the six months ended June 30, 2017.

The increase in contract land and directional drilling revenue was primarily attributable to our directional drilling services, which accounted for $6 million, or 61% of the total increase as a result of increased utilization from 26% for the six months ended June 30, 2017 to 46% for the six months ended June 30, 2018. Our rig moving services accounted for $2 million, or 24%, of the operating division increase primarily due to increased activity. Our land drilling services accounted for $1 million, or 16%, of the operating division increase as a result of an increase in average day rates from approximately $14,250 for the six months ended June 30, 2017 to approximately $16,882 for

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the six months ended June 30, 2018, partially offset by a decrease in average active rigs from six for the six months ended June 30, 2017 to five rigs for the six months ended June 30, 2018.

Other Services. Other revenue, consisting of revenue derived from our coil tubing, pressure control, flowback, cementing, acidizing, equipment rental, crude oil hauling and remote accommodations businesses, increased $24 million, or 126%, to $43 million for the six months ended June 30, 2018 from $19 million for the six months ended June 30, 2017. Revenue derived from related parties, consisting primarily of equipment rental and cementing revenue from Gulfport, was $17 million, or 39% of total other revenues, for the six months ended June 30, 2018 and $3 million, or 14% of total other revenues, for the six months ended June 30, 2017. Inter-segment revenues, consisting primarily of revenue derived from our infrastructure and pressure pumping segments, totaled $4 million and $0.1 million for the six months ended June 30, 2018 and 2017.

Stingray Cementing and Stingray Energy, which we acquired in June 2017, contributed revenues of $21 million for the six months ended June 30, 2018 compared to $3 million for the six months ended June 30, 2017. Revenues from our coil tubing, pressure control and flowback services increased $7 million for the six months ended June 30, 2018 compared to six months ended June 30, 2017 primarily due to increases in utilization.

Cost of Revenue (exclusive of depreciation, depletion, amortization and accretion expense). Cost of revenue, exclusive of depreciation, depletion, amortization and accretion expense, increased $530 million from $136 million, or 78% of total revenue, for the six months ended June 30, 2017 to $666 million, or 65%of total revenue, for the six months ended June 30, 2018. The increase was primarily due to the expansion of our infrastructure services business, which represented a $405 million increase in cost of revenue, as well as an increase in pressure pumping division costs of $94 million, primarily related to the addition of three new fleets during 2017, and an increase in natural sand proppant division costs of $41 million, primarily due to an increase in tons of sand sold during the six months ended June 30, 2018 compared to the six months ended June 30, 2017. Cost of revenue by operating division was as follows:

Pressure Pumping Services. Pressure pumping services division cost of revenue, exclusive of depreciation and amortization expense, increased $94 million, or 142%, to $160 million for the six months ended June 30, 2018 from $66 million for the six months ended June 30, 2017. The increase was primarily due to the expansion of services into the SCOOP/STACK and Permian Basin with the addition of three fleets during 2017, which accounted for $83 million, or 88%, of the increase. As a percentage of revenue, our pressure pumping services division cost of revenue, exclusive of depreciation and amortization expense of $28 million and $19 million for the six months ended June 30, 2018 and 2017, was 79% and 73%, respectively, for the six months ended June 30, 2018 and June 30, 2017. The increase in costs as a percentage of revenue was primarily due to an increase in cost of goods sold as a result of selling sand with our service package to customers in the mid-continent region.

Infrastructure Services. Infrastructure services division cost of revenue, exclusive of depreciation and amortization expense, was $407 million and $2 million, respectively, for the six months ended June 30, 2018 and 2017. The increase is due to the expansion of our infrastructure business in late 2017 and 2018. The largest components of our cost of revenue include labor-related costs, including contract labor, and travel, meals and lodging expense. As a percentage of revenue, cost of revenue, exclusive of depreciation and amortization expense of $7 million and $0.3 million for the six months ended June 30, 2018 and 2017, was 59% and 100%, respectively, for the six months ended June 30, 2018 and 2017.

Natural Sand Proppant Services. Natural sand proppant services division cost of revenue, exclusive of depreciation, depletion and accretion expense, increased $41 million, or 123%, from $33 million for the six months ended June 30, 2017 to $74 million for the six months ended June 30, 2018, primarily due to an increase in cost of goods sold as a result of a 146% increase in tons of sand sold in the 2018 period. As a percentage of revenue, cost of revenue, exclusive of depreciation, depletion and accretion expense of $6 million and $4 million for the six months ended June 30, 2018 and 2017, was 71% and 82%, respectively, for the six months ended June 30, 2018 and June 30, 2017. The decrease is primarily due to startup costs incurred for our Piranha plant, which was acquired in May 2017.

Contract Land and Directional Drilling Services. Contract land and directional drilling services division cost of revenue, exclusive of depreciation expense, increased $7 million, or 30%, from $23 million for the six months ended June 30, 2017 to $30 million for the six months ended June 30, 2018, primarily due to increased utilization. As a percentage of revenue, our contract land and directional drilling services division cost of revenue, exclusive of depreciation expense of $10 million for both the six months ended June 30, 2018 and 2017, was 92% and 99%, respectively, for the six months ended June 30, 2018 and June 30, 2017. The decrease was primarily due to higher day rates and a decrease in compensation and benefits expense as a percentage of revenue.

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Other Services. Other services division cost of revenue, exclusive of depreciation and amortization expense, increased $21 million, or 153%, from $14 million for the six months ended June 30, 2017 to $35 million for the six months ended June 30, 2018, primarily due to the acquisition of Stingray Cementing and Stingray Energy in June 2017. As a percentage of revenue, cost of revenue, exclusive of depreciation and amortization expense of $7 million and $4 million for the six months ended June 30, 2018 and 2017, was 82% and 73%, respectively, for the six months ended June 30, 2018 and 2017. The increase is primarily the result of increased equipment rental expense and labor-related costs as a percentage of revenue.

Selling, General and Administrative Expenses. Selling, general and administrative expenses represent the costs associated with managing and supporting our operations. These expenses increased $89 million, or 618%, to $104 million for the six months ended June 30, 2018, from $14 million for the six months ended June 30, 2017 primarily related to costs incurred for the expansion of our infrastructure business, an increase in provisions for bad debt and an increase in equity based compensation. The equity based compensation represents compensation expense for awards issued by certain Wexford affiliates and had no cash impact to the Company and no dilutive impact relative to the number of shares outstanding. Following is a breakout of SG&A expenses for the periods indicated (in thousands):

	Six Months Ended
	June 30, 2018		June 30, 2017
Cash expenses:
Compensation and benefits	$	18,677	$	5,381
Professional services	5,568		3,581
Other(a)	5,542		3,880
Total cash SG&A expense	29,787		12,842
Non-cash expenses:
Bad debt provision	53,790		(25		)
Equity based compensation(b)	17,487		—
Stock based compensation	2,574		1,620
Total non-cash SG&A expense	73,851		1,595
Total SG&A expense	$	103,638	$	14,437

a. Includes travel-related costs, IT expenses, rent, utilities and other general and administrative-related costs.

b. Represents compensation expense for non-employee awards, which were issued and are payable by certain affiliates of Wexford (the sponsor level).

Depreciation, Depletion, Amortization and Accretion. Depreciation, depletion, amortization and accretion increased $21 million, or 55%, to $58 million for the six months ended June 30, 2018 from $37 million for the six months ended June 30, 2017. The increase is primarily attributable to an increase in property and equipment purchases in the second half of 2017 and first half of 2018, resulting in increased depreciation expense.

Operating Income (Loss). Operating income increased $215 million to $200 million for the six months ended June 30, 2018 compared to an operating loss of $14 million for the six months ended June 30, 2017. The increase was primarily the result of an expansion of our infrastructure services business, which accounted for 93%, or $201 million, of the overall increase in operating income and a $21 million increase in natural sand proppant operating income. These were partially offset by a $10 million decrease in pressure pumping operating income due to an increase in non-cash equity compensation expense during the six months ended June 30, 2018.

Interest Expense, Net. Interest expense, net increased $1 million, or 46%, during the six months ended June 30, 2018 primarily due to an increase in average borrowings outstanding during the six months ended June 30, 2018 compared to the six months ended June 30, 2017.

Other Expense, Net. Non-operating charges, net resulted in expense of $1 million and $0.4 million for the six months ended June 30, 2018 and 2017. Both periods were primarily comprised of loss recognition on assets disposed of during the period.

Income Taxes. We recorded income tax expense of $99 million on pre-tax income of $198 million for the six months ended June 30, 2018 compared to an income tax benefit of $6 million on pre-tax loss of $12 million for the six months ended

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June 30, 2017. Our effective tax rate was 50% for the six months ended June 30, 2018 compared to 37% for the six months ended June 30, 2017. The increase in effective tax rate is primarily due to the equity based compensation expense recognized during the six months ended June 30, 2018 as well as a higher tax rate in Puerto Rico, where most of our income was generated during the six months ended June 30, 2018, compared to the United States tax rate. No income was generated in Puerto Rico during the six months ended June 30, 2017.

Non-GAAP Financial Measures

Adjusted EBITDA

Adjusted EBITDA is a supplemental non-GAAP financial measure that is used by management and external users of our financial statements, such as industry analysts, investors, lenders and rating agencies. We define Adjusted EBITDA as net income (loss) before depreciation, depletion, accretion and amortization, acquisition related costs, public offering costs, equity based compensation, stock based compensation, bargain purchase gain, interest expense, net, other (income) expense, net (which is comprised of the (gain) or loss on disposal of long-lived assets) and provision (benefit) for income taxes. We exclude the items listed above from net income (loss) in arriving at Adjusted EBITDA because these amounts can vary substantially from company to company within our industries depending upon accounting methods and book values of assets, capital structures and the method by which the assets were acquired. Adjusted EBITDA should not be considered as an alternative to, or more meaningful than, net income (loss) or cash flows from operating activities as determined in accordance with GAAP or as an indicator of our operating performance or liquidity. Certain items excluded from Adjusted EBITDA are significant components in understanding and assessing a company’s financial performance, such as a company’s cost of capital and tax structure, as well as the historic costs of depreciable assets, none of which are components of Adjusted EBITDA. Our computations of Adjusted EBITDA may not be comparable to other similarly titled measures of other companies. We believe that Adjusted EBITDA is a widely followed measure of operating performance and may also be used by investors to measure our ability to meet debt service requirements.

The following tables provide a reconciliation of Adjusted EBITDA to the GAAP financial measure of net income or (loss) for each of our operating segments for the specified periods (in thousands).

Consolidated

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018		2017			2018		2017
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Depreciation, depletion, accretion and amortization expense	30,795		19,893			57,703		37,130
Impairment of long-lived assets	187		—			187		—
Acquisition related costs	77		961			31		2,208
Public offering costs	731		—			731		—
Equity based compensation	17,487		—			17,487		—
Stock based compensation	1,660		1,050			2,916		1,620
Bargain purchase gain	—		(4,012		)	—		(4,012		)
Interest expense, net	959		1,112			2,196		1,509
Other expense, net	486		203			514		387
Provision (benefit) for income taxes	53,512		(2,804		)	99,430		(5,910		)
Adjusted EBITDA	$	148,594	$	15,233		$	279,441	$	26,781

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Pressure Pumping Services

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018			2017		2018			2017
Net income	$	(11,433	)	$	1,187	$	(9,474	)	$	1,369
Depreciation and amortization expense	13,829			9,626		27,815			18,784
Acquisition related costs	33			—		33			—
Public offering costs	202			—		202			—
Equity based compensation	17,487			—		17,487			—
Stock based compensation	453			503		871			774
Interest expense	341			303		845			431
Other expense, net	80			4		92			7
Adjusted EBITDA	$	20,992		$	11,623	$	37,871		$	21,365

Infrastructure Services

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018		2017			2018			2017
Net income (loss)	$	52,359	$	(568	)	$	99,658		$	(702	)
Depreciation and amortization expense	4,094		340			6,501			340
Acquisition related costs	4		42			(4		)	42
Public offering costs	360		—			360			—
Stock based compensation	606		—			1,063			—
Interest expense	106		4			182			4
Other expense, net	330		—			332			—
Provision for income taxes	52,632		—			100,589			—
Adjusted EBITDA	$	110,491	$	(182	)	$	208,681		$	(316	)

Natural Sand Proppant Services

	Three Months Ended					Six Months Ended
	June 30,					June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018		2017			2018			2017
Net income	$	10,929	$	3,409		$	20,301		$	2,643
Depreciation, depletion, accretion and amortization expense	3,881		2,206			6,197			3,569
Acquisition related costs	—		916			(38		)	1,954
Public offering costs	95		—			95			—
Stock based compensation	205		182			391			252
Bargain purchase gain	—		(4,012		)	—			(4,012		)
Interest expense	76		353			156			486
Other expense, net	36		140			23			154
Provision for income taxes	—		9			—			9
Adjusted EBITDA	$	15,222	$	3,203		$	27,125		$	5,055

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Contract Land and Directional Drilling Services

	Three Months Ended						Six Months Ended
	June 30,						June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018			2017			2018			2017
Net loss	$	(5,454	)	$	(6,470	)	$	(10,904	)	$	(13,314	)
Depreciation and amortization expense	5,349			4,974			9,704			9,942
Impairment of long-lived assets	187			—			187			—
Acquisition related costs	—			3			—			25
Public offering costs	34			—			34			—
Stock based compensation	301			180			408			292
Interest expense, net	265			440			660			657
Other expense, net	32			60			72			224
Adjusted EBITDA	$	714		$	(813	)	$	161		$	(2,174	)

Other Services^(a) 

	Three Months Ended						Six Months Ended
	June 30,						June 30,
Reconciliation of Adjusted EBITDA to net income (loss):	2018			2017			2018			2017
Net (loss) income	$	(3,453	)	$	1,272		$	(1,346	)	$	3,853
Depreciation and amortization expense	3,642			2,747			7,486			4,495
Acquisition related costs	40			—			40			187
Public offering costs	40			—			40			—
Stock based compensation	94			184			183			301
Interest expense, net	171			12			353			(69		)
Other expense, net	8			(1		)	(5		)	2
(Benefit) provision for income taxes	880			(2,813		)	(1,158		)	(5,919		)
Adjusted EBITDA	$	1,422		$	1,401		$	5,593		$	2,850

(a) Includes results for our coil tubing, pressure control, flowback, cementing, acidizing, equipment rentals, crude oil hauling and remote accommodations services and corporate related activities. Our corporate related activities do not generate revenue.

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Adjusted Net Income and Adjusted Earnings per Share

Adjusted net income and adjusted earnings per share are supplemental non-GAAP financial measures that are used by management to evaluate our operating and financial performance. Management believes these measures provide meaningful information about the Company's performance by excluding certain non-cash charges that may not be indicative of the Company's ongoing operating results. Adjusted net income and adjusted earnings per share should not be considered in isolation or as a substitute for net income and earnings per share prepared in accordance with GAAP and may not be comparable to other similarly titled measures of other companies. The following tables provide a reconciliation of adjusted net income and adjusted earnings per share to the GAAP financial measures of net income and earnings per share for the periods specified.

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2018		2017			2018		2017
	(in thousands, except per share amounts)
Net income, as reported	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Equity based compensation	17,487		—			17,487		—
Adjusted net income	$	60,187	$	(1,170	)	$	115,733	$	(6,151	)
Basic earnings per share, as reported	$	0.95	$	(0.03	)	$	2.20	$	(0.16	)
Equity based compensation	0.40		—			0.40		—
Adjusted basic earnings per share	$	1.35	$	(0.03	)	$	2.60	$	(0.16	)
Diluted earnings per share, as reported	$	0.95	$	(0.03	)	$	2.18	$	(0.16	)
Equity based compensation	0.39		—			0.39		—
Adjusted diluted earnings per share	$	1.34	$	(0.03	)	$	2.57	$	(0.16	)

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Liquidity and Capital Resources

We require capital to fund ongoing operations, including maintenance expenditures on our existing fleet of equipment, organic growth initiatives, investments and acquisitions. Since November 2014, our primary sources of liquidity have been cash on hand, borrowings under our revolving credit facility, cash flows from operations and proceeds from our initial public offering. Our primary use of capital has been for investing in property and equipment used to provide our services and to acquire complementary businesses. On July 16, 2018, we initiated a quarterly dividend policy a declared our first quarterly cash dividend to be paid in August 2018. Future declaration of cash dividends are subject to approval by our Board of Directors and may be adjusted at their discretion based on market conditions and capital availability.

As of June 30, 2018, we had no borrowings outstanding under our revolving credit facility and $163 million of available borrowing capacity under this facility, after giving effect to $7 million of outstanding letters of credit.

The following table summarizes our liquidity for the periods indicated (in thousands):

	June 30,			December 31,
	2018			2017
Cash and cash equivalents	$	10,702		$	5,637
Revolving credit facility availability	169,233			169,233
Less long-term debt	—			(99,900		)
Less letter of credit facilities (environmental remediation)	(3,582		)	(3,582		)
Less letter of credit facilities (insurance programs)	(2,486		)	(2,486		)
Less letter of credit facilities (rail car commitments)	(455		)	(455		)
Net working capital (less cash)(a)	5,688			88,798
Total	$	179,100		$	157,245

a. Net working capital (less cash) is a non-GAAP measure and is calculated by subtracting total current liabilities of $365 million and cash and cash equivalents of $11 million from total current assets of $382 million as of June 30, 2018. As of December 31, 2017, net working capital (less cash) is calculated by subtracting total current liabilities of $220 million and cash and cash equivalents of $6 million from total current assets of $314 million.

At August 3, 2018, we had no borrowings outstanding under our revolving credit facility, leaving an aggregate of $163 million of available borrowing capacity under this facility, which is net of letters of credit of $7 million.

Liquidity and Cash Flows

The following table sets forth our cash flows at the dates indicated (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Net cash provided by operating activities	$	125,128		$	9,586		$	226,451		$	24,004
Net cash used in investing activities	(85,755		)	(71,952		)	(121,243		)	(102,693		)
Net cash provided by (used in) financing activities	(39,073		)	57,926			(100,045		)	57,926
Effect of foreign exchange rate on cash	(45		)	62			(98		)	73
Net change in cash	$	255		$	(4,378	)	$	5,065		$	(20,690	)

Operating Activities

Net cash provided by operating activities was $226 million for the six months ended June 30, 2018, compared to $24 million for the six months ended June 30, 2017. Net cash provided by operating activities was $125 million for the three months ended June 30, 2018 compared to $10 million for the three months ended June 30, 2017. The increase in operating cash flows was primarily attributable to the increase in net income as a result of the expansion of our infrastructure services business and improvements in our pressure pumping and sand businesses.

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Investing Activities

Net cash used in investing activities was $121 million for the six months ended June 30, 2018, compared to $103 million for the six months ended June 30, 2017. Net cash used in investing activities was $86 million for the three months ended June 30, 2018, compared to $72 million for the three months ended June 30, 2017. Cash used in investing activities was used to purchase property and equipment that is utilized to provide our services and to acquire complementary businesses.

The following table summarizes our capital expenditures by operating division for the periods indicated (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Pressure pumping services(a)	$	8,233	$	24,737	$	16,099	$	53,402
Infrastructure services(b)	40,778		3,958		56,556		3,958
Natural sand proppant services(c)	6,958		2,795		12,658		2,970
Contract and directional drilling services(d)	7,083		3,632		10,701		5,901
Other(e)	9,959		344		12,771		344
Total capital expenditures	$	73,011	$	35,466	$	108,785	$	66,575

a.     Capital expenditures primarily for pressure pumping equipment for the six months ended June 30, 2018 and 2017.

b.     Capital expenditures primarily for trucks and other equipment for the six months ended June 30, 2018 and 2017.

c.    Capital expenditures primarily for plant upgrades for the six months ended June 30, 2018 and 2017.

d. Capital expenditures primarily for upgrades to our rig fleet and real estate purchases for the six months ended June 30, 2018 and upgrades to our rig fleet for the six months ended June 30, 2017.

e.    Capital expenditures primarily for equipment for our rental and crude oil hauling businesses for the six months ended June 30, 2018.

Financing Activities

Net cash used in financing activities was $100 million for the six months ended June 30, 2018, compared to net cash provided by financing activities of $58 million for the six months ended June 30, 2017. Net cash used in financing activities was $39 million for the three months ended June 30, 2018, compared to net cash provided by financing activities of $58 million for the three months ended June 30, 2017. Net cash used in financing activities was primarily attributable to net repayments under our revolving credit facility of $39 million and $99 million, respectively for the three and six months ended June 30, 2018. Net cash provided by financing activities was primarily attributable to net borrowings under our revolving credit facility of $65 million for the three and six months ended June 30, 2017.

Effect of Foreign Exchange Rate on Cash

The effect of foreign exchange rate on cash was ($0.1) million and $0.1 million, respectively, for the six months ended June 30, 2018 and 2017. The change was driven primarily by a favorable (unfavorable) shift in the weakness (strength) of the Canadian dollar relative to the U.S. dollar for the cash held in Canadian accounts.

Working Capital

Our working capital totaled $16 million and $94 million, respectively, at June 30, 2018 and December 31, 2017. Our cash balances were $11 million and $6 million, respectively, at June 30, 2018 and December 31, 2017.

Our Revolving Credit Facility

We are party to a $170 million revolving credit and security agreement, dated as of November 25, 2014 as subsequently amended, with PNC Capital Markets LLC, as lead arranger, PNC Bank, National Association, as the administrative and collateral agent, and the lenders from time-to-time party thereto. Our revolving credit facility matures on November 25, 2019. Borrowings under our revolving credit facility are secured by our and our subsidiaries’ assets. The maximum availability for future borrowings under our revolving credit facility is subject to a borrowing base calculation prepared monthly.

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Effective as of July 12, 2017, our revolving credit facility was amended, providing us with greater flexibility for permitted acquisitions and permitted indebtedness, increasing the maximum amount credited to the borrowing base for sand inventory and for in-transit inventory and increasing certain default thresholds from $5 million to $15 million.

Effective as of July 9, 2018, our revolving credit facility was again amended to, among other things, permit (i) the declaration of quarterly cash distributions on the shares representing equity of Mammoth if, among other things, after giving effect to the payment of such dividend or distributions contemplated by the declaration, pro forma excess availability would be no less than 22.5% of the maximum available credit and no default or event of default exists, (ii) the payment of the declared dividends or distributions if (x) such dividends or distributions are made within sixty (60) days after the declaration thereof and (y) on the date such dividends or distributions are made, (1) after giving effect to the payment of such dividend or distribution, pro forma excess availability would be no less than 22.5% of the maximum available credit and (2) no material default or material event of default shall have occurred, or would result therefrom, and (iii) the issuance of third-party surety bonds in favor of Mammoth and its subsidiaries in relation with their bonded contracts, in each case subject to the additional limitations described in the Third Amendment.

Interest is payable monthly at a base rate set by the institution’s commercial lending group plus an applicable margin. Additionally, at our request, outstanding balances, are permitted to be converted to LIBOR rate plus applicable margin tranches at set increments of $500,000. The LIBOR rate option allows us to select interest periods from one, two, and three or six months. The applicable margin for either the base rate or the LIBOR rate option can vary from 1.5% to 3.0%, based upon a calculation of the excess availability of the line as a percentage of the maximum credit limit.

At June 30, 2018, we had no outstanding borrowings under our credit facility. At June 30, 2018, we had availability of $163 million under our revolving credit facility, after giving effect to $7 million of outstanding letters of credit.

Our revolving credit facility contains various customary affirmative and restrictive covenants. Among the covenants are two financial covenants, including a minimum interest coverage ratio (3.0 to 1.0), and a maximum leverage ratio (4.0 to 1.0), and minimum availability ($10.0 million). As of June 30, 2018 and December 31, 2017, we were in compliance with these financial covenants.

Capital Requirements and Sources of Liquidity

During 2018, we currently estimate that our aggregate capital expenditures will be approximately $205 million. These capital expenditures include $98 million in our infrastructure services segment for assets for additional crews, $25 million in our natural sand proppant services segment primarily related to expansion projects, $21 million in our pressure pumping segment for various pressure pumping equipment, $14 million in our contract land and directional drilling services segment primarily for rig upgrades and real estate, $17 million for expansion of our rental equipment business in Ohio and into Oklahoma, $10 million for the expansion of our water transfer business, $8 million for the expansion of our crude hauling business, $6 million for coil tubing equipment and $6 million for other capital expenditures. During the first half of 2018, our capital expenditures totaled $109 million.

We believe that our cash on hand, operating cash flow and available borrowings under our revolving credit facility will be sufficient to fund our operations for at least the next twelve months. However, future cash flows are subject to a number of variables, and significant additional capital expenditures could be required to conduct our operations. There can be no assurance that operations and other capital resources will provide cash in sufficient amounts to maintain planned or future levels of capital expenditures. Further, we continue to pursue our previously announced acquisition strategy to enhance our portfolio of products and services, market positioning and/or geographic presence in both other existing and new industries. In doing so, we regularly evaluate acquisition opportunities. However, we do not have a specific acquisition budget for 2018 since the timing and size of acquisitions cannot be accurately forecasted. Our acquisitions may be undertaken with cash, our common stock or a combination of cash, common stock and/or other consideration. In the event we make one or more additional acquisitions and the amount of capital required is greater than the amount we have available for acquisitions at that time, we could be required to reduce the expected level of capital expenditures and/or seek additional capital. If we seek additional capital for that or other reasons, we may do so through borrowings under our revolving credit facility, joint venture partnerships, asset sales, offerings of debt or equity securities or other means. We cannot assure you that this additional capital will be available on acceptable terms or at all. If we are unable to obtain funds we need, we may not be able to complete acquisitions that may be favorable to us or finance the capital expenditures necessary to conduct our operations.

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Off-Balance Sheet Arrangements

Lease Obligations

We lease real estate, rail cars and other equipment under long-term operating leases with varying terms and expiration dates through 2062.

Minimum Purchase Commitments

We have entered into agreements with suppliers that contain minimum purchase obligations. Our failure to purchase the minimum amounts may require us to pay shortfall fees. However, the minimum quantities set forth in the agreements are not in excess of our currently expected future requirements.

Capital Spend Commitments

We have entered into agreements with suppliers to acquire capital equipment.

Aggregate future minimum lease payments under these agreements in effect at June 30, 2018 are as follows (in thousands):

Year ended December 31:	Operating Leases		Capital Spend Commitments		Minimum Purchase Commitments
Remainder of 2018	$	12,148	$	16,393	$	19,254
2019	18,091		—		12,125
2020	15,622		—		400
2021	12,029		—		165
2022	8,995		—		—
Thereafter	6,057		—		—
	$	72,942	$	16,393	$	31,944

Other Commitments

Subsequent to June 30, 2018, we entered into rail car and property lease agreements with aggregate commitments of $2.4 million.

Subsequent to June 30, 2018, we ordered additional capital equipment with aggregate commitments of $9.6 million.

Subsequent to June 30, 2018, subsidiaries in the Company's infrastructure segment entered into an air chart agreement, barge chartering agreement and other service agreements with aggregate commitments of $2.5 million, $2.1 million and $0.6 million, respectively.

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New Accounting Pronouncements

In February 2016, the FASB issued ASU No, 2016-2 “Leases” amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less.  All other leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. ASU 2016-2 is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. We plan to adopt this ASU effective January 1, 2019 utilizing the modified retrospective method of adoption. This new leasing guidance will impact us in situations where we are the lessee, and in certain circumstances we will have a right-of-use asset and lease liability on our consolidated financial statements. We are currently evaluating the effect the new guidance may have on our consolidated financial statements and results of operations.

In June 2018, the FASB issued ASU No. 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Accounting,” which simplifies the accounting for share-based payments granted to non-employees by aligning the accounting with requirements for employee share-based compensation. Upon transition, this ASU requires non-employee awards to be measured at fair value as of the adoption date. This ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. Early adoption is permitted. Currently, we have not elected to early adopt this ASU and are evaluating the impact it will have on our consolidated financial statements.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

The demand, pricing and terms for our products and services are largely dependent upon the level of activity for the U.S. oil and natural gas industry, energy infrastructure industry and natural sand proppant industry. Industry conditions are influenced by numerous factors over which we have no control, including, but not limited to: the supply of and demand for oil and natural gas services, energy infrastructure services and natural sand proppant; the level of construction of transmission lines, substations and distribution networks in the energy infrastructure industry and the level of expenditures of utility companies; the level of prices of, and expectations about future prices for, oil and natural gas and natural sand proppant, as well as energy infrastructure services; the cost of exploring for, developing, producing and delivering oil and natural gas; the expected rates of declining current production; the discovery rates of new oil and natural gas reserves and frac sand reserves meeting industry specifications and consisting of the mesh size in demand; access to pipeline, transloading and other transportation facilities and their capacity; weather conditions; domestic and worldwide economic conditions; political instability in oil-producing countries; environmental regulations; technical advances affecting energy consumption; the price and availability of alternative fuels; the ability of oil and natural gas producers and other users of our services to raise equity capital and debt financing; and merger and divestiture activity in industries in which we operate.

The level of activity in the U.S. oil and natural gas exploration and production, energy infrastructure and natural sand proppant industries is volatile. Expected trends may not continue and demand for our products and services may not reflect the level of activity in these industries. Any prolonged substantial reduction in pricing environment would likely affect demand for our services. A material decline in pricing levels or U.S. activity levels could have a material adverse effect on our business, financial condition, results of operations and cash flows.

Interest Rate Risk

We had a cash and cash equivalents balance of $11 million at June 30, 2018. We do not enter into investments for trading or speculative purposes. We do not believe that we have any material exposure to changes in the fair value of these investments as a result of changes in interest rates. Declines in interest rates, however, will reduce future income.

Interest under our credit facility is payable at a base rate plus an applicable margin. Additionally, at our request, outstanding balances are permitted to be converted to LIBOR rate plus applicable margin tranches. The applicable margin for either the base rate or the LIBOR rate option can vary from 1.5% to 3.0%, based upon a calculation of the excess availability of the line as a percentage of the maximum credit limit. At June 30, 2018, we had no outstanding borrowings under our revolving credit facility. As of June 28, 2018, the last day on which we had outstanding borrowings under our revolving credit facility, a 1% increase or decrease in the interest rate would have increased or decreased our interest expense by approximately $0.2 million per year, based on $20 million outstanding and a weighted average interest rate of 4.55%. We do not currently hedge our interest rate exposure.

Foreign Currency Risk

Our remote accommodation business, which is included in our other energy services segment, generates revenue and incurs expenses that are denominated in the Canadian dollar. These transactions could be materially affected by currency fluctuations. Changes in currency exchange rates could adversely affect our consolidated results of operations or financial position. We also maintain cash balances denominated in the Canadian dollar. At June 30, 2018, we had $3 million of cash, in Canadian dollars, in Canadian accounts. A 10% increase in the strength of the Canadian dollar versus the U.S. dollar would have resulted in an increase in pre-tax income of approximately $0.1 million as of June 30, 2018. Conversely, a corresponding decrease in the strength of the Canadian dollar would have resulted in a comparable decrease in pre-tax income. We have not hedged our exposure to changes in foreign currency exchange rates and, as a result, could incur unanticipated translation gains and losses.

Seasonality

We provide completion and production services as well as contract land and drilling services primarily in the Utica, Permian Basin, Eagle Ford, Marcellus, Granite Wash, Cana Woodford and Cleveland sand resource plays located in the continental U.S. We provide infrastructure services in the northeast, southwest and midwest portions of the United States and in Puerto Rico. We provide remote accommodation services in the oil sands in Alberta, Canada. We serve these markets through our facilities and service centers that are strategically located to serve our customers in Ohio, Texas, Oklahoma, Wisconsin, Minnesota, Kentucky, Puerto Rico and Alberta, Canada. A portion of our revenues are generated in Ohio, Wisconsin, Minnesota, North Dakota, Pennsylvania, West Virginia and Canada where weather conditions may be severe. As a result, our

52

operations may be limited or disrupted, particularly during winter and spring months, in these geographic regions, which would have a material adverse effect on our financial condition and results of operations. Our operations in Oklahoma and Texas are generally not affected by seasonal weather conditions.

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Item 4. Controls and Procedures

Evaluation of Disclosure Control and Procedures

Under the direction of our Chief Executive Officer and Chief Financial Officer, we have established disclosure controls and procedures, as defined in Rule 13a-15(e) and d under the Exchange Act, that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. The disclosure controls and procedures are also intended to ensure that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosures. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.

As of June 30, 2018, an evaluation was performed under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures pursuant to Rule 13a-15(b) under the Exchange Act. Based upon our evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that as of June 30, 2018, our disclosure controls and procedures are effective.

Changes in Internal Control Over Financial Reporting

There was no change in our internal control over financial reporting (as defined in Rules 13a-15(d) and 15d-15(d) under the Exchange Act) that occurred during the quarter ended June 30, 2018 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Due to the nature of our business, we are, from time to time, involved in litigation or subject to disputes or claims related to our business activities, including breaches of contractual obligations, workers’ compensation claims and employment related disputes. In the opinion of our management, none of the pending litigation, disputes or claims against us is expected to have a material adverse effect on our financial condition, cash flows or results of operations. See Note 18 "Commitments and Contingencies," of the Notes to Unaudited Condensed Consolidated Financial Statements for additional information.

Item 1A. Risk Factors

Security holders and potential investors in our securities should carefully consider the risk factors in our Annual Report on Form 10-K (Commission File No. 001-37917) filed with the SEC on February 28, 2018 and in our Rule 424(b)(5) prospectus summary and related base prospectus filed with the SEC on June 26, 2018. 

There have been no material changes to the Risk Factors previously disclosed in our Prospectus Summary dated July 26, 2018.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Not applicable.

Item 4. Mine Safety Disclosures

Our operations are subject to the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006, which imposes stringent health and safety standards on numerous aspects of mineral extraction and processing operations, including the training of personnel, operating procedures, operating equipment and other matters. Our failure to comply with such standards, or changes in such standards or the interpretation or enforcement thereof, could have a material adverse effect on our business and financial condition or otherwise impose significant restrictions on our ability to conduct mineral extraction and processing operations. Following passage of The Mine Improvement and New Emergency Response Act of 2006, MSHA significantly increased the numbers of citations and orders charged against mining operations.  The dollar penalties assessed for citations issued has also increased in recent years.  Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104) is included in Exhibit 95.1 to this Report.

Item 5. Other Information

Not applicable.

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MAMMOTH ENERGY SERVICES, INC.

Item 6. Exhibits

The following exhibits are filed as a part of this report:

		Incorporated By Reference
Exhibit Number	Exhibit Description	Form	Commission File No.	Filing Date	Exhibit No.	Filed Herewith	Furnished Herewith
3.1	Amended and Restated Certificate of Incorporation of the Company	8-K	001-37917	11/15/2016	3.1
3.2	Amended and Restated Bylaws of the Company	8-K	001-37917	11/15/2016	3.2
4.1	Specimen Certificate for shares of common stock, par value $0.01 per share, of the Company	S-1/A	333-213504	10/3/2016	4.1
4.2	Registration Rights Agreement, dated October 12, 2016, by and between the Company and Mammoth Energy Holdings, LLC	8-K	001-37917	11/15/2016	4.1
4.3	Investor Rights Agreement, dated October 12, 2016, by and between the Company and Gulfport Energy Corporation	8-K	001-37917	11/15/2016	4.2
4.4	Registration Rights Agreement, dated October 12, 2016, by and between the Company and Rhino Exploration LLC	8-K	001-37917	11/15/2016	4.3
10.1	Master Service Contract for PREPA's Electrical Grid Repairs Hurricane Maria, executed on May 26, 2018, by the Puerto Rico Electric Power Authority (PREPA) and Cobra Acquisitions LLC.	8-K	001-37917	5/31/2018	10.1
10.2	Third Amendment to Revolving Credit and Security Agreement, dated as of July 9, 2018, by and among Mammoth Energy Services, Inc., and certain of its direct and indirect subsidiaries, the lenders party to the Revolving Credit and Security Agreement from time to time and PNC Bank, National Association, as a lender and agent for the lenders.	8-K	001-37917	7/13/2018	10.1
10.3#	Amendment No. 2, dated as of July 10, 2018, between Stingray Pressure Pumping, LLC and Gulfport Energy Corporation to that certain Amended & Restated Master Services Agreement for Pressure Pumping Services, effective as of October 1, 2014, as amended effective January 1, 2016.					X
10.4	Second Amendment to Sand Supply Agreement, dated as of August 6, 2018, between Muskie Proppant LLC and Gulfport Energy Corporation					X
31.1	Certification of Chief Executive Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934.					X
31.2	Certification of Chief Financial Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934.					X
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
95.1	Mine Safety Disclosure Exhibit					X
101.1	Interactive data files pursuant to Rule 405 of Regulation S-T.
#	Confidential treatment requested as to certain portions, which portions have been omitted and filed separately with the Securities and Exchange Commission.

56

MAMMOTH ENERGY SERVICES, INC.

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			MAMMOTH ENERGY SERVICES, INC.
Date:	August 7, 2018	By:	/s/ Arty Straehla
			Arty Straehla
			Chief Executive Officer
Date:	August 7, 2018	By:	/s/ Mark Layton
			Mark Layton
			Chief Financial Officer

57

EX-10.3

Exhibit 10.3

CONFIDENTIAL TREATMENT REQUESTED

AMENDMENT NO. 2 TO

MASTER SERVICE AGREEMENT¹ 

THIS AMENDMENT NO. 2 TO MASTER SERVICE AGREEMENT (this “Amendment”) is entered into effective as of July 1st, 2018 by and between Gulfport Energy Corporation (the “Company”) and Stingray Pressure Pumping LLC (the “Contractor”).

WHEREAS, Company and Contractor are parties to that certain Master Service Agreement dated December 3, 2012, as first amended and restated on October 1, 2014 (the “Agreement”); and

WHEREAS, Company and Contractor desire to enter into this Amendment in order to permit Contractor and/or its affiliates to continue to provide Services to the Company under the Agreement.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, Company and Contractor agree as follows:

1.Definitions. Except as otherwise provided in this Amendment, capitalized terms used herein have the meaning ascribed to them in the Agreement.

2.    Service Area. Recital C of the Agreement is amended and restated to read as follows:

“C.    Company desires to retain Contractor to provide the Services in the states of Ohio and/or Oklahoma (the “Service Area”).”

3.    Term of Agreement; Suspension; Resumption. Section 1 of the Agreement is hereby amended to extend the Term until December 31, 2021 unless earlier terminated in accordance with the Agreement; provided, however, that beginning on October 1, 2018, Company may order the suspension of such Services for up to one crew and only one crew at any point in time, by providing at least ninety (90) days prior written notice to Contractor of such suspension. While Services are suspended, Company shall have no payment, fee, or other obligation associated with the suspended crew, which would otherwise be required under the Agreement or any Amendment thereto. Under the provisions herein, prior written notice for the suspension may be delivered prior to October 1, 2018 and may begin as early as October 1, 2018. Monthly Service Fees shall be paid to Contractor pro-rata up until the later of (i) the day of the suspension of such Services or (ii) the expiration of the ninety (90) day notice period. Contractor shall resume Services for Company upon Company’s request, which must be provided with at least ninety (90) days prior written notice, unless such advance notice is waived by Contractor. Unless otherwise mutually agreed upon between Company and Contractor, any request by Company for the resumption of Services shall be for a minimum of forty-five (45) days. Monthly Service Fees shall be paid to Contractor pro-rata beginning on the day that Services are resumed. Services shall be deemed to end, in the case of the suspension of Services, on the day that the last piece of equipment arrives at Contractor’s facility, and Services

_________________________

¹The appearance of [*] denotes confidential information that has been omitted from this exhibit and filed separately with the Securities and Exchange Commission pursuant to a confidential treatment request under Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

CONFIDENTIAL TREATMENT REQUESTED

shall be deemed to begin, in the case of the resumption of Services, on the day that the first piece of equipment leaves Contractor’s facility.

Not withstanding anything to the contrary, for the period between July 1, 2018 and September 30, 2018 (an “Initial Suspension Period”) Company and Contractor desire to suspend Services. During the Initial Suspension Period, (i) Contractor shall not provide any Services for the suspended Frac Spread(s), other than the “[*]¹”, to Company under the Agreement, and (ii) Contractor may use the Dedicated Frac Spread(s) for other customers but is under no obligation to do so. Contractor agrees to utilize commercially reasonable efforts to use the Dedicated Frac Spread(s) for other customers during the Initial Suspension Period. If Contractor is able to use the Dedicated Frac Spread(s) for other customers during the Initial Suspension Period, Company will not incur any obligation to Contractor, as long as [*]¹. In the event [*]¹ or Contractor is unable to find customers to use the Dedicated Frac Spread(s) during the Initial Suspension Period, Contractor will provide Services to Company in the amount [*]¹. In the event Contractor is unable to utilize Dedicated Frac Spread(s) for other customers, Contractor and Company will defer [*]¹ (“Recoupment Costs”) per Dedicated Frac Spread. Company and Contractor agree that services will be performed and that the Recoupment Costs shall be recovered during the period of October 1, 2018 to December 31, 2018 via equal monthly amounts, which in sum shall equal the Recoupment Costs. Company and Contractor agree that Recoupment Costs represent Company’s sole obligation to Contractor during the Initial Suspension Period and are intended to satisfy any obligations for Service Fees, Reimbursable Expenses or other requirements under the Agreement.

4.    Provision of Services. Section 2(b) of the Agreement is amended and restated to read as follows:

“During the Term, Contractor will dedicate up to two (2) frac spreads (each as more specifically described in Exhibit A, and together with related equipment for a spread, is referred to as a “Dedicated Frac Spread” and collectively referred to as the “Dedicated Frac Spreads”) for the performance of the Services for Company in the Service Area. Each Dedicated Frac Spread will be available for the provision of Services commencing on the In-Service Date set forth with respect thereto on Exhibit A. Company shall use only Contractor’s Dedicated Frac Spreads for the first two (2) frac spreads in the Service Area utilized by the Company. After July 1, 2018, Company may re-designate individual well locations for Company’s wells in the Service Area utilizing the Dedicated Frac Spreads. In connection with the provision of the Services, Contractor shall be responsible for and shall select and provide all necessary equipment and supplies for the performance of the Services except as specifically noted in this Agreement or the applicable Work Order to be provided by Company (the Dedicated Frac Spreads and equipment and supplies provided by Contractor, including any substitutions and replacements thereof, are referred to as the “Equipment”). Contractor may determine when and if any Equipment can be demobilized or if additional equipment is needed; provided that any changes to the

_________________________

¹The appearance of [*] denotes confidential information that has been omitted from this exhibit and filed separately with the Securities and Exchange Commission pursuant to a confidential treatment request under Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

2

CONFIDENTIAL TREATMENT REQUESTED

Equipment will be done after consultation with Company and any replacement equipment must be capable of providing the Services. Company shall not have any right to restrict Contractor from demobilizing or replacing any Equipment from a Site.”

5.    Effect of Amendment. All other terms and conditions of the Agreement not modified by this Amendment shall remain in full force and effect. Except as set forth in this Amendment, the Agreement is ratified and affirmed in its entirety and, as amended hereby, shall continue to bind Company, Contractor and their respective successors and assigns.

6.    Counterparts. This Amendment may be executed in multiple counterparts, each of which shall constitute an original instrument, but all of which together shall constitute one and the same Amendment.

Signature Page Follows

3

CONFIDENTIAL TREATMENT REQUESTED

IN WITNESS WHEREOF, Company and Contractor have entered into this Amendment effective as of the date first set forth above.

COMPANY:

GULFPORT ENERGY CORP.

By: /s/ Michael G. Moore

Name: Michael G. Moore

Title: CEO & President

CONTRACTOR:

STINGRAY PRESSURE PUMPING

By: /s/ Mark Layton

Name: Mark Layton

Title: CFO

Signature Page

Amendment No. 2 to Master Service Agreement

EX-10.4

SECOND AMENDMENT TO SAND SUPPLY AGREEMENT

This Second Amendment to Sand Supply Agreement (this “Second Amendment”) is made this 6th day of August, 2018 (the “Execution Date”) by and between Muskie Proppant LLC, a Delaware limited liability company, (“Supplier”); and Gulfport Energy Corporation, a Delaware corporation, (Customer”). Supplier and Customer are sometimes individually referred to as a “Party”, or collectively referred to as the “Parties”.

WHEREAS, Supplier and Customer entered into a that certain Sand Supply Agreement dated October 1, 2014, further amended and modified by that certain Amendment to Supply Agreement, dated October 1, 2015, (the “Agreement”), pursuant to which Supplier agreed to sell sand to Customer, more particularly 40/70 proppant sand (the “Product”), subject to the terms and conditions in the Agreement.

WHEREAS, Article I Section 1.1 of the Agreement provided for an Initial Term, commencing on October 1, 2014 and ending on September 30, 2018.

WHEREAS, Article I Section 1.2 of the Agreement allows the Parties to extend the Term of the Agreement by written amendment executed by both Parties.

WHEREAS, Supplier and Customer desire to extend the Term of the Agreement.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, and intending to be legally bound, the Parties agree as follows:

1.Defined Terms. Capitalized terms used but not defined herein shall have the same meanings given to such terms in the Agreement.

2.Recitals. The foregoing recitals are incorporated into and made a part of this Second Amendment.

3.Term. The Term, as defined by Article I of the Agreement, shall be extended to December 31, 2021.

4.Counterparts. This Amendment may be executed in a number of identical counterparts, including, without limitation, facsimile or email execution copies. If so executed, each counterpart is to be deemed an original for all purposes, and all such counterparts shall, collectively, constitute one agreement.

5.Binding Effect. This Amendment shall be binding upon and shall inure to the benefit of the Parties hereto and their respective legal representatives, successors and assigns.

6.Entire Agreement. This Amendment and the Agreement, together with their respective exhibits, constitute the entire understanding between the Parties with respect to the subject matter hereof, superseding all related negotiations, prior discussions and prior agreements and understandings. No amendment hereto shall be binding unless mutually agreed to in a written instrument specifically made subject to the Agreement, as modified by this Amendment.

[Signature Page Follows]

IN WITNESS WHEREOF, this Amendment has been duly executed by each Party as of the date first written above.

SELLER:	CUSTOMER:
Muskie Proppant, LLC	Gulfport Energy Corporation
By: /s/ Arty Straehla Name: Arty Straehla Title: CEO	By: /s/ Michael G. Moore Name: Michael G. Moore Title: CEO

EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, Arty Straehla, Chief Executive Officer, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Mammoth Energy Services, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f) and 15d-15(f) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	MAMMOTH ENERGY SERVICES, INC.
By:	/s/ Arty Straehla
	Arty Straehla
	Chief Executive Officer
	8/7/2018

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, Mark Layton, Chief Financial Officer, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Mammoth Energy Services, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f) and 15d-15(f) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

	MAMMOTH ENERGY SERVICES, INC.
By:	/s/ Mark Layton
	Mark Layton
	Chief Financial Officer
	8/7/2018

EX-32.1

EXHIBIT 31.2

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Mammoth Energy Services, Inc. (the “Company”) for the quarterly period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Arty Straehla, as Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”); and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	MAMMOTH ENERGY SERVICES, INC.
By:	/s/ Arty Straehla
	Arty Straehla
	Chief Executive Officer
	8/7/2018

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liability under that section. This certification shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended or the Exchange Act, except to the extent that the Company specifically incorporates it by reference.

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF THE CHIEF FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Mammoth Energy Services, Inc. (the “Company”) for the quarterly period ended June 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark Layton, as Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”); and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	MAMMOTH ENERGY SERVICES, INC.
By:	/s/ Mark Layton
	Mark Layton
	Chief Financial Officer
	8/7/2018

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to liability under that section. This certification shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended or the Exchange Act, except to the extent that the Company specifically incorporates it by reference.

EX-95.1

EXHIBIT 95.1

Mine Safety Disclosure

The following disclosures are provided pursuant to the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Act”) and Item 104 of Regulation S-K, which requires certain disclosures by companies required to file periodic reports under the Securities Exchange Act of 1934, as amended, that operate mines regulated under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”).

Mine Safety Information. Whenever the Federal Mine Safety and Health Administration (“MSHA”) believes a violation of the Mine Act, any health or safety standard or any regulation has occurred, it may issue a citation which describes the alleged violation and fixes a time within which the U.S. mining operator must abate the alleged violation. In some situations, such as when MSHA believes that conditions pose a hazard to miners, MSHA may issue an order removing miners from the area of the mine affected by the condition until the alleged hazards are corrected. When MSHA issues a citation or order, it generally proposes a civil penalty, or fine, as a result of the alleged violation, that the operator is ordered to pay. Citations and orders can be contested and appealed, and as part of that process, are often reduced in severity and amount, and are sometimes dismissed. The number of citations, orders and proposed assessments vary depending on the size and type (underground or surface) of the mine as well as by the MSHA inspector(s) assigned.

Mine Safety Data. The following provides additional information about references used in the table below to describe the categories of violations, orders or citations issued by MSHA under the Mine Act:

• Section 104 S&S Citations: Citations received from MSHA under section 104 of the Mine Act for violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of a mine safety or health hazard.

• Section 104(b) Orders: Orders issued by MSHA under section 104(b) of the Mine Act, which represents a failure to abate a citation under section 104(a) within the period of time prescribed by MSHA. This results in an order of immediate withdrawal from the area of the mine affected by the condition until MSHA determines that the violation has been abated.

• Section 104(d) Citations and Orders: Citations and orders issued by MSHA under section 104(d) of the Mine Act for unwarrantable failure to comply with mandatory health or safety standards.

• Section 110(b)(2) Violations: Flagrant violations issued by MSHA under section 110(b)(2) of the Mine Act.

• Section 107(a) Orders: Orders issued by MSHA under section 107(a) of the Mine Act for situations in which MSHA determined an “imminent danger” (as defined by MSHA) existed.

The following table details the violations, citations and orders issued to us by MSHA during the quarter ended June 30, 2018:

Mine (a)	Section 104 S&S Citations(#)	Section104(b)Orders (#)	Section104(d)Citations and Orders(#)	Section 110(b)(2) Violations(#)	Section107(a)Orders (#)	Proposed Assessments (2)($, amounts in dollars)		Mining Related Fatalities (#)
Taylor, WI	4	—	—	—	—	$	1,144	—
Menomonie, WI	1	—	—	—	—	$	118	—
New Auburn, WI	1	—	—	—	—	$	138	—

a. The definition of mine under section 3 of the Mine Act includes the mine, as well as other items used in, or to be used in, or resulting from, the work of extracting minerals, such as land, structures, facilities, equipment, machines, tools and minerals preparation facilities. Unless otherwise indicated, any of these other items associated with a single mine have been aggregated in the totals for that mine. MSHA assigns an identification number to each mine and may or may not assign separate identification numbers to related facilities such as preparation facilities. We are providing the information in the table by mine rather than MSHA identification number because that is how we manage and operate our mining business and we believe this presentation will be more useful to investors than providing information based on MSHA identification numbers.

b. Represents the total dollar value of proposed assessments from MSHA under the Mine Act relating to any type of citation or order issued during the quarter ended June 30, 2018.

Pattern or Potential Pattern of Violations. During the quarter ended June 30, 2018, none of the mines operated by us received written notice from MSHA of (a) a pattern of violations of mandatory health or safety standards that are of such nature as could

have significantly and substantially contributed to the cause and effect of mine health or safety hazards under section 104(e) of the Mine Act or (b) the potential to have such a pattern.

Pending Legal Actions. There were no legal actions pending before the Federal Mine Safety and Health Review Commission (the Commission) as of June 30, 2018. The Commission is an independent adjudicative agency established by the Mine Act that provides administrative trial and appellate review of legal disputes arising under the Mine Act.

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 03, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Mammoth Energy Services, Inc.
Entity Central Index Key	0001679268
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		44,755,678

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 10,702	$ 5,637
Accounts receivable, net	312,850	243,746
Receivables from related parties	30,674	33,788
Inventories	12,717	17,814
Prepaid expenses	13,811	12,552
Other current assets	816	886
Total current assets	381,570	314,423
Property, plant and equipment, net	423,315	351,017
Sand reserves	73,759	74,769
Intangible assets, net	12,930	16,139
Goodwill	101,511	99,811
Deferred income tax asset	31,892	6,739
Other non-current assets	4,146	4,345
Total assets	1,029,123	867,243
CURRENT LIABILITIES
Accounts payable	177,353	141,306
Payables to related parties	1,916	1,378
Accrued expenses and other current liabilities	54,701	40,895
Income taxes payable	131,210	36,409
Total current liabilities	365,180	219,988
Long-term debt	0	99,900
Deferred income tax liabilities	31,036	34,147
Asset retirement obligation	3,138	2,123
Other liabilities	4,100	3,289
Total liabilities	403,454	359,447
COMMITMENTS AND CONTINGENCIES (Note 18)
EQUITY
Common stock, $0.01 par value, 200,000,000 shares authorized, 44,752,765 and 44,589,306 issued and outstanding at June 30, 2018 and December 31, 2017, respectively	448	446
Additional paid in capital	528,421	508,010
Retained earnings	100,247	2,001
Accumulated other comprehensive loss	(3,447)	(2,661)
Total equity	625,669	507,796
Total liabilities and equity	1,029,123	867,243
Trade names
CURRENT ASSETS
Intangible assets, net	6,726	6,516
Customer relationships
CURRENT ASSETS
Intangible assets, net	$ 6,204	$ 9,623

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares, issued (in shares)	44,752,765	44,589,306
Common stock, shares, outstanding (in shares)	44,752,765	44,589,306

XML

CONDENSED CONSOLDIATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUE
Revenue	$ 533,594	$ 98,262	$ 1,027,843	$ 173,228
COST AND EXPENSES
Selling, general and administrative (Note 12)	64,595	7,393	102,677	13,806
Selling, general and administrative - related parties	532	307	961	631
Depreciation, depletion, amortization and accretion	30,795	19,893	57,703	37,130
Impairment of long-lived assets	187	0	187	0
Total cost and expenses	435,937	104,933	827,457	187,405
Operating income (loss)	97,657	(6,671)	200,386	(14,177)
OTHER (EXPENSE) INCOME
Interest expense, net	(959)	(1,112)	(2,196)	(1,509)
Bargain purchase gain, net of tax	0	4,012	0	4,012
Other, net	(486)	(203)	(514)	(387)
Total other (expense) income	(1,445)	2,697	(2,710)	2,116
Income (loss) before income taxes	96,212	(3,974)	197,676	(12,061)
Provision (benefit) for income taxes	53,512	(2,804)	99,430	(5,910)
Net income (loss)	42,700	(1,170)	98,246	(6,151)
OTHER COMPREHENSIVE INCOME (LOSS)
Foreign currency translation adjustment, net of tax of $86, $272, $434 and $454, respectively, for the three and six months ended June 30, 2018 and three and six months ended June 30, 2017	(325)	181	(786)	409
Comprehensive income (loss)	$ 42,375	$ (989)	$ 97,460	$ (5,742)
Net income (loss) per share (basic) (Note 14) (in USD per share)	$ 0.95	$ (0.03)	$ 2.20	$ (0.16)
Net income (loss) per share (diluted) (Note 14) (In USD per share)	$ 0.95	$ (0.03)	$ 2.18	$ (0.16)
Weighted average number of shares outstanding (basic) (Note 14) (in shares)	44,737	39,500	44,700	38,506
Weighted average number of shares outstanding (diluted) (Note 14) (in shares)	45,059	39,500	44,977	38,506
Services
REVENUE
Revenue	$ 455,545	$ 29,659	$ 864,204	$ 56,751
COST AND EXPENSES
Cost of revenue	302,283	57,104	593,262	102,565
Products
REVENUE
Revenue	27,708	10,395	52,748	13,767
COST AND EXPENSES
Cost of revenue	35,117	19,974	68,447	32,581
Related parties
COST AND EXPENSES
Selling, general and administrative - related parties	532	307	961	631
Related parties | Services
REVENUE
Revenue	40,611	44,603	89,699	77,565
COST AND EXPENSES
Cost of revenue	2,428	262	4,220	692
Related parties | Products
REVENUE
Revenue	$ 9,730	$ 13,605	$ 21,192	$ 25,145

XML

CONDENSED CONSOLDIATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) (Parenthetical) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Foreign currency translation adjustment, tax	$ 86,000	$ 434,000	$ 272,000	$ 454,000
Services
Cost of revenue, depreciation, depletion, amortization and accretion	26,898,000	17,651,000	51,473,000	33,489,000
Products
Cost of revenue, depreciation, depletion, amortization and accretion	3,879,000	2,204,000	6,193,000	3,566,000
Related parties | Services
Cost of revenue, depreciation, depletion, amortization and accretion	$ 0	$ 0	$ 0	$ 0

XML

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - USD ($) $ in Thousands	Total	Members' Equity	Common Stock	Retailed Earnings (Deficit)	Additional Paid-in Capital	AOCL	Stingray Entities	Stingray Entities Common Stock	Stingray Entities Additional Paid-in Capital	Sturgeon Acquisitions LLC	Sturgeon Acquisitions LLC Members' Equity	Sturgeon Acquisitions LLC Common Stock	Sturgeon Acquisitions LLC Additional Paid-in Capital
Beginning balance (in shares) at Dec. 31, 2016			37,500,000
Beginning balance at Dec. 31, 2016	$ 422,781		$ 375	$ (56,323)	$ 400,206	$ (3,216)
Members' Equity at Dec. 31, 2016		$ 81,739
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income of Sturgeon prior to acquisition	640	640
Acquisition of company (in shares)								1,393,000				5,607,000
Acquisition of company							$ 25,762	$ 14	$ 25,748	$ (4,010)	$ (82,379)	$ 56	$ 78,313
Stock based compensation (in shares)			89,000
Stock based compensation	3,744		$ 1		3,743
Net income	58,324			58,324
Other comprehensive income (loss)	$ 555					555
Ending balance (in shares) at Dec. 31, 2017	44,589,306		44,589,000
Ending balance at Dec. 31, 2017	$ 507,796		$ 446	2,001	508,010	(2,661)
Members' Equity at Dec. 31, 2017		0
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Equity based compensation (Note 15)	17,487				17,487
Stock based compensation (in shares)			164,000
Stock based compensation	2,926		$ 2		2,924
Net income	98,246			98,246
Other comprehensive income (loss)	$ (786)					(786)
Ending balance (in shares) at Jun. 30, 2018	44,752,765		44,753,000
Ending balance at Jun. 30, 2018	$ 625,669		$ 448	$ 100,247	$ 528,421	$ (3,447)
Members' Equity at Jun. 30, 2018		$ 0

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 98,246	$ (6,151)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Equity based compensation (Note 15)	17,487	0
Stock based compensation	2,916	1,620
Depreciation, depletion, accretion and amortization	57,703	37,130
Amortization of coil tubing strings	1,120	1,046
Amortization of debt origination costs	199	199
Bad debt expense	53,790	19
(Gain) loss on disposal of property and equipment	(128)	127
Gain on bargain purchase	0	(4,012)
Impairment of long-lived assets	187	0
Deferred income taxes	(27,906)	(6,529)
Changes in assets and liabilities, net of acquisitions of businesses:
Accounts receivable, net	(122,908)	(4,793)
Receivables from related parties	3,114	(12,995)
Inventories	4,156	(4,932)
Prepaid expenses and other assets	(1,195)	1,528
Accounts payable	34,186	20,557
Payables to related parties	538	(83)
Accrued expenses and other liabilities	10,193	1,301
Income taxes payable	94,753	(28)
Net cash provided by operating activities	226,451	24,004
Cash flows from investing activities:
Purchases of property and equipment	(105,349)	(66,575)
Purchases of property and equipment from related parties	(3,436)	0
Business acquisitions	(13,356)	(39,570)
Proceeds from disposal of property and equipment	898	781
Business combination cash acquired (Note 4)	0	2,671
Net cash used in investing activities	(121,243)	(102,693)
Cash flows from financing activities:
Borrowings from lines of credit	52,000	79,150
Repayments of lines of credit	(151,900)	(14,150)
Repayments of equipment financing note	(145)	0
Repayment of Stingray acquisition long-term debt	0	(7,074)
Net cash (used in) provided by financing activities	(100,045)	57,926
Effect of foreign exchange rate on cash	(98)	73
Net change in cash and cash equivalents	5,065	(20,690)
Cash and cash equivalents at beginning of period	5,637	29,239
Cash and cash equivalents at end of period	10,702	8,549
Supplemental disclosure of cash flow information:
Cash paid for interest	2,543	1,086
Cash paid for income taxes	32,584	912
Supplemental disclosure of non-cash transactions:
Purchases of property and equipment included in accounts payable and accrued expenses	20,897	7,836
Acquisition of Sturgeon, Stingray Cementing LLC and Stingray Energy Services LLC (Note 4)	$ 0	$ 23,091

XML

Organization and Nature of Business

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Nature of Business

Organization and Nature of Business

Mammoth Energy Services, Inc. (the “Company,” “Mammoth Inc.” or “Mammoth”), together with its subsidiaries, is an integrated, growth-oriented company serving both the oil and gas and the electric utility industries in North America and U.S. territories. Mammoth's subsidiaries provide a diversified set of drilling and completion services to the exploration and production industry and its infrastructure division provides transmission, distribution and logistics services to various public and privately owned utilities throughout the U.S. and Puerto Rico. The Company was incorporated in Delaware in June 2016 as a wholly-owned subsidiary of Mammoth Energy Partners LP, a Delaware limited partnership (the “Partnership” or the “Predecessor”). The Partnership was originally formed by Wexford Capital LP (“Wexford”) in February 2014 as a holding company under the name Redback Inc. and was converted to a Delaware limited partnership in August 2014. On November 24, 2014, Mammoth Energy Holdings LLC (“Mammoth Holdings,” an entity controlled by Wexford), Gulfport Energy Corporation (“Gulfport”) and Rhino Resource Partners LP (“Rhino”) (collectively known as the “Predecessor Interest”) contributed their interest in certain of the entities presented below to the Partnership in exchange for 20 million limited partner units. Mammoth Energy Partners GP, LLC (the “General Partner”) held a non-economic general partner interest.

On October 12, 2016, the Partnership was converted into a Delaware limited liability company named Mammoth Energy Partners LLC (“Mammoth LLC”), and then Mammoth Holdings, Gulfport and Rhino, as all the members of Mammoth LLC, contributed their member interests in Mammoth LLC to Mammoth Inc. Prior to the conversion and the contribution, Mammoth Inc. was a wholly-owned subsidiary of the Partnership. Following the conversion and the contribution, Mammoth LLC (as the converted successor to the Partnership) was a wholly-owned subsidiary of Mammoth Inc. Mammoth Inc. did not conduct any material business operations until Mammoth LLC was contributed to it. On October 19, 2016, Mammoth Inc. closed its initial public offering of 7,750,000 shares of common stock (the “IPO”), which included an aggregate of 250,000 shares that were offered by Mammoth Holdings, Gulfport and Rhino, at a price to the public of $15.00 per share.

On June 29, 2018, Gulfport and MEH Sub LLC ("MEH Sub"), an entity controlled by Wexford, (collectively, the "Selling Stockholders") completed an underwritten secondary public offering of 4,000,000 shares of the Company’s common stock at a purchase price to the Selling Stockholders of $38.01 per share. The Selling Stockholders granted the underwriters an option to purchase up to an aggregate of 600,000 additional shares of the Company's common stock at the same purchase price. This option was exercised, in part, and on July 30, 2018, the underwriters purchased an additional 385,000 shares of common stock from the Selling Stockholders at the same price per share. The Selling Stockholders received all proceeds from this offering.

At June 30, 2018 and December 31, 2017, Wexford, Gulfport and Rhino beneficially owned the following shares of outstanding common stock of Mammoth Inc.:

	At June 30, 2018			At December 31, 2017
	Share Count	% Ownership		Share Count	% Ownership
Wexford	22,252,277	49.7	%	25,009,319	56.1	%
Gulfport	9,943,645	22.2	%	11,171,887	25.1	%
Rhino	104,100	0.2	%	568,794	1.3	%
Outstanding shares owned by related parties	32,300,022	72.1	%	36,750,000	82.5	%
Total outstanding	44,752,765	100.0	%	44,589,306	100.0	%

Operations

The Company's infrastructure services include electric utility contracting services focused on the repair, upgrade, maintenance and construction of transmission and distribution networks. The Company’s infrastructure services also provide storm repair and restoration services in response to natural disasters including hurricanes, ice or other storm-related damage. The Company's pressure pumping services include equipment and personnel used in connection with the completion and early production of oil and natural gas wells. The Company's natural sand proppant services include the distribution and production of natural sand proppant that is used primarily for hydraulic fracturing in the oil and gas industry. The Company's contract land and directional drilling services provides drilling rigs and directional tools for both vertical and horizontal drilling of oil and natural gas wells and salt water disposal wells. The Company also provides other services, including coil tubing units used to enhance the flow of oil and natural gas, flowback, cementing, aciziding, equipment rentals, crude oil hauling and remote accommodations.

All of the Company’s operations are in North America and in the Caribbean. The Company operates its oil and natural gas businesses in the Permian Basin, the Utica Shale, the Eagle Ford Shale, the Marcellus Shale, the Granite Wash, the SCOOP, the STACK, the Cana-Woodford Shale, the Cleveland Sand and the oil sands located in Northern Alberta, Canada. The Company operates its energy infrastructure services in the northeast, southwest and midwest portions of the United States and Puerto Rico. The Company's oil and natural gas business depends in large part on the conditions in the oil and natural gas industry and, specifically, on the amount of capital spending by its customers. Any prolonged increase or decrease in oil and natural gas prices affects the levels of exploration, development and production activity, as well as the entire health of the oil and natural gas industry. Changes in the commodity prices for oil and natural gas could have a material effect on the Company’s results of operations and financial condition. The Company’s business also depends on infrastructure spending on maintenance, upgrade, expansion and repair and restoration. Any prolonged decrease in spending by electric utility companies or delays or reductions in government appropriations could have a material adverse effect on the Company’s results of operations and financial condition.

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Basis of Presentation and Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated interim financial statements include the accounts of the Company and its subsidiaries and the variable interest entity ("VIE") for which the Company is the primary beneficiary. All material intercompany accounts and transactions have been eliminated.

This report has been prepared in accordance with the rules and regulations of the Securities and Exchange Commission, and reflects all adjustments, which in the opinion of management are necessary for the fair presentation of the results for the interim periods, on a basis consistent with the annual audited consolidated financial statements. Certain information, accounting policies and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles (“GAAP”) have been omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the summary of significant accounting policies and notes thereto included in the Company’s most recent annual report on Form 10-K.

On June 5, 2017, the Company acquired Sturgeon Acquisitions LLC ("Sturgeon") and Sturgeon's wholly owned subsidiaries Taylor Frac, LLC, Taylor Real Estate Investments, LLC and South River Road, LLC. Prior to its acquisition of Sturgeon, the Company and Sturgeon were under common control and it is required under GAAP to account for this common control acquisition in a manner similar to the pooling of interest method of accounting. Therefore, the Company's historical financial information for all periods included in the accompanying financial statements has been recast to combine Sturgeon with the Company as if the acquisition had been effective since the date Sturgeon commenced operations. Refer to Note 4 - Acquisitions for additional disclosure regarding the acquisition of Sturgeon.

Accounts Receivable

Accounts receivable include amounts due from customers for services performed and are recorded as the work progresses. The Company grants credit to customers in the ordinary course of business and generally does not require collateral. Most areas in which the Company operates provide for a mechanic’s lien against the property on which the service is performed if the lien is filed within the statutorily specified time frame. Customer balances are generally considered delinquent if unpaid by the 30th day following the invoice date and credit privileges may be revoked if balances remain unpaid.

The Company regularly reviews receivables and provides for estimated losses through an allowance for doubtful accounts. In evaluating the level of established reserves, the Company makes judgments regarding its customers’ ability to make required payments, economic events and other factors. As the financial condition of customers changes, circumstances develop, or additional information becomes available, adjustments to the allowance for doubtful accounts may be required. In the event the Company was to determine that a customer may not be able to make required payments, the Company would increase the allowance through a charge to income in the period in which that determination is made. Uncollectible accounts receivable are periodically charged against the allowance for doubtful accounts once a final determination is made regarding their uncollectability.

Following is a roll forward of the allowance for doubtful accounts for the year ended December 31, 2017 and the six months ended June 30, 2018 (in thousands):

Balance, January 1, 2017	$	5,377
Additions charged to expense	16,206
Additions other	179
Deductions for uncollectible receivables written off	(25		)
Balance, December 31, 2017	21,737
Additions charged to expense	53,790
Deductions for uncollectible receivables written off	(1,758		)
Balance, June 30, 2018	$	73,769

In October 2017, Cobra Acquisitions LLC ("Cobra"), one of the Company's subsidiaries, entered into a contract with the Puerto Rico Electric Power Authority ("PREPA") to perform repairs to PREPA’s electrical grid as a result of Hurricane Maria. At June 30, 2018 and December 31, 2017, the Company reviewed receivables due from PREPA and made specific reserves consistent with Company policy which resulted in additions to the allowance for doubtful accounts totaling $53.6 million and $16.0 million, respectively, for the six months ended June 30, 2018 and year ended December 31, 2017.

Additionally, the Company has made specific reserves consistent with Company policy which resulted in additions to allowance for doubtful accounts totaling $0.2 million and $0.2 million, respectively, for the six months ended June 30, 2018 and year ended December 31, 2017. The Company will continue to pursue collection until such time as final determination is made consistent with Company policy.

Concentrations of Credit Risk and Significant Customers

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents in excess of federally insured limits and trade receivables. Following is a summary of our significant customers based on percentages of total accounts receivable balances at June 30, 2018 and December 31, 2017 and percentages of total revenues derived for the three and six months ended June 30, 2018 and 2017:

	REVENUES								ACCOUNTS RECEIVABLE
	Three Months Ended June 30,				Six Months Ended June 30,				At June 30,		At December 31,
	2018		2017		2018		2017		2018		2017
Customer A(a)	65	%	—	%	65	%	—	%	59	%	56	%
Customer B(b)	9	%	59	%	11	%	59	%	9	%	12	%

a. Customer A is a third-party customer. Revenues and the related accounts receivable balances earned from Customer A were derived from the Company's infrastructure services segment.

b. Customer B is a related party customer. Revenues and the related accounts receivable balances earned from Customer B were derived from the Company's pressure pumping services segment, natural sand proppant services segment, contract land and directional drilling services segment and other businesses.

Fair Value of Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, trade receivables, trade payables, amounts receivable or payable to related parties, and long-term debt. The carrying amount of cash and cash equivalents, trade receivables, receivables from related parties and trade payables approximates fair value because of the short-term nature of the instruments. The fair value of long-term debt approximates its carrying value because the cost of borrowing fluctuates based upon market conditions.

New Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-2 “Leases” amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less.  All other leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. ASU 2016-2 is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. The Company plans to adopt this ASU effective January 1, 2019 utilizing the modified retrospective method of adoption. This new leasing guidance will impact the Company in situations where it is the lessee, and in certain circumstances it will have a right-of-use asset and lease liability on its consolidated financial statements. The Company is currently evaluating the effect the new guidance may have on the Company's consolidated financial statements and results of operations.

In June 2018, the FASB issued ASU No. 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Accounting,” which simplifies the accounting for share-based payments granted to non-employees by aligning the accounting with requirements for employee share-based compensation. Upon transition, this ASU requires non-employee awards to be measured at fair value as of the adoption date. This ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. Early adoption is permitted. Currently, the Company has not elected to early adopt this ASU and is evaluating the impact it will have on the Company's consolidated financial statements.

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Revenues

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenues

Revenues

Adoption of ASC 606 "Revenues from Contracts with Customers"

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition, and most industry-specific guidance. The new guidance requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

On January 1, 2018, the Company adopted ASU 2014-09 and its related amendments (collectively, "ASC 606") using the modified retrospective method applied to contracts which were not completed as of January 1, 2018. Revenues for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts continue to be reported under previous revenue recognition guidance. While ASC 606 requires additional disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of the Company's revenues.

The adoption of ASC 606 represents a change in accounting principle. After evaluation of all contracts not completed as of January 1, 2018, the Company determined the cumulative effect of adopting ASC 606 was immaterial, and as such, has not recorded an adjustment to the opening balance of retained earnings on January 1, 2018.

Revenue Recognition

The following table presents revenues disaggregated by service line (in thousands):

	Three Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Revenue:
Pressure pumping services	$	101,406		$	50,196		$	202,544		$	90,836
Infrastructure services	360,250			1,709			685,709			1,709
Natural sand proppant services	52,845			24,762			103,860			40,359
Contract land and directional drilling services	17,210			12,472			32,440			23,223
Other services	20,167			10,242			43,062			19,092
Eliminations	(18,284		)	(1,119		)	(39,772		)	(1,991		)
Total revenue	$	533,594		$	98,262		$	1,027,843		$	173,228

Pressure Pumping Services

Pressure pumping services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Generally, the Company accounts for pressure pumping services as a single performance obligation satisfied over time. In certain circumstances, the Company supplies proppant that is utilized for pressure pumping as part of the agreement with the customer. The Company accounts for these pressure pumping agreements as multiple performance obligations satisfied over time. Jobs for these services are typically short-term in nature and range from a few hours to multiple days. Generally, revenue is recognized over time upon the completion of each segment of work based upon a completed field ticket, which includes the charges for the services performed, mobilization of the equipment to the location and personnel.

Pursuant to a contract with one of its customers, the Company has agreed to provide that customer with use of two pressure pumping fleets for the period covered by the contract. Under this agreement, performance obligations are satisfied as services are rendered based on the passage of time rather than the completion of each segment of work. The Company has the right to receive consideration from this customer even if circumstances prevent us from performing work. All consideration owed to the Company for services performed during the contractual period is fixed and the right to receive it is unconditional.

Additional revenue is generated through labor charges and the sale of consumable supplies that are incidental to the service being performed. Such amounts are recognized ratably over the period during which the corresponding goods and services are consumed.

Infrastructure Services

Infrastructure services are typically provided pursuant to master service agreements, repair and maintenance contracts or fixed price and non-fixed price installation contracts. Pricing under these contracts may be unit priced, cost-plus/hourly (or time and materials basis) or fixed price (or lump sum basis). The Company accounts for infrastructure services as a single performance obligation satisfied over time. Revenue is recognized over time as work progresses based on the days completed or as the contract is completed.

Natural Sand Proppant Services

The Company sells natural sand proppant through sand supply agreements with its customers. Under these agreements, sand is typically sold at a flat rate per ton or a flat rate per ton with an index-based adjustment. The Company recognizes revenue at the point in time when the customer obtains legal title to the product, which may occur at the production facility, rail origin or at the destination terminal.

Certain of the Company's sand supply agreements contain a minimum volume commitment related to sand purchases whereby the Company charges a shortfall payment if the customer fails to meet the required minimum volume commitment. These agreements may also contain make-up provisions whereby shortfall payments can be applied in future periods against purchased volumes exceeding the minimum volume commitment. If a make-up right exists, the Company has future performance obligations to deliver excess volumes of product in subsequent months. In accordance with ASC 606, if the customer fails to meet the minimum volume commitment, the Company will assess whether it expects the customer to fulfill its unmet commitment during the contractually specified make-up period based on discussions with the customer and management's knowledge of the business. If the Company expects the customer will make-up deficient volumes in future periods, revenue related to shortfall payments will be deferred and recognized on the earlier of the date on which the customer utilizes make-up volumes or the likelihood that the customer will exercise its right to make-up deficient volumes becomes remote. If the Company does not expect the customer will make-up deficient volumes in future periods, the breakage model will be applied and revenue related to shortfall payments will be recognized when the model indicates the customer's inability to take delivery of excess volumes. During the three and six months ended June 30, 2018, the Company recognized $0.3 million in revenue related to shortfall payments.

In certain of the Company's sand supply agreements, the customer obtains control of the product when it is loaded into rail cars and the customer reimburses the Company for all freight charges incurred. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the sand. If revenue is recognized for the related product before the shipping and handling activities occur, the Company accrues the related costs of those shipping and handling activities.

Contract Land and Directional Drilling Services

Contract drilling services are provided under daywork contracts. Directional drilling services, including motor rentals, are provided on a day rate or hourly basis, and revenue is recognized as work progresses. Performance obligations are satisfied over time as the work progresses based on the measure of output. Mobilization revenue and costs are recognized over the days of actual drilling.

Other Services

The Company also provides coil tubing, pressure control, flowback, cementing, acidizing, equipment rentals, crude oil hauling and remote accommodations services, which are reported under other services. These services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Performance obligations for these services are satisfied over time and revenue is recognized as the work progresses based on the measure of output. Jobs for these services are typically short-term in nature and range from a few hours to multiple days.

Practical Expedients

The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts in which variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied distinct good or service that forms part of a single performance obligation.

Performance Obligations and Contract Balances

As of June 30, 2018 and January 1, 2018, the Company had contract liabilities totaling $15.0 million, which are included in accrued expenses and other current liabilities in the unaudited condensed consolidated balance sheets, and did not have any contract assets. Revenue recognized in the current period from performance obligations satisfied in previous periods was a nominal amount for the three and six months ended June 30, 2018. As of June 30, 2018, the Company had unsatisfied performance obligations totaling $68.5 million, which will be recognized over the next 2.5 years.

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Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisitions

Acquisitions

(a) Acquisition of WTL Oil

On May 31, 2018, the Company completed its acquisition of WTL Oil LLC ("WTL") for total consideration of $5.5 million in cash to the sellers plus $0.6 million in consideration to be paid upon completion of certain contractual obligations. As of June 30, 2018, the $0.6 million of contingent consideration is reflected in accrued expenses and other current liabilities on the unaudited condensed consolidated balance sheet. The seller completed these obligations and the Company paid the additional $0.6 million to the seller in July 2018.

The Company used cash on hand and borrowings under its credit facility to fund the acquisition. The acquisition of WTL expanded the Company's service offerings into the crude oil hauling business.

The following table summarizes the fair value of WTL as of May 31, 2018 (in thousands):

	WTL
Property, plant and equipment	$	2,960
Identifiable intangible assets - customer relationships(a)	930
Identifiable intangible assets - trade name(a)	650
Goodwill(b)	1,567
Total assets acquired	$	6,107

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 10-20 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, WTL provided the following activity (in thousands):

	2018
Revenues	$	595
Net income(a)	5

a.    Includes depreciation and amortization expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of WTL had occurred as of January 1, 2017 (in thousands):

	Six Months Ended
	June 30, 2018		June 30, 2017
Revenues	$	3,354	$	1,553
Net income	90		62

The Company recognized $0.1 million of transaction related costs during the three months ended June 30, 2018 related to this acquisition.

(b) Acquisition of RTS Energy Services

On June 15, 2018, the Company completed its acquisition of RTS Energy Services LLC ("RTS") for total consideration of $7.6 million in cash to the sellers plus $0.5 million to be paid 90 days after closing subject to contractual conditions. As of June 30, 2018, the $0.5 million of contingent consideration is reflected in accrued expenses and other current liabilities on the unaudited condensed consolidated balance sheet. The Company used cash on hand and borrowings under its credit facility to fund the acquisition. The acquisition of RTS expanded Mammoth's cementing services into the Permian Basin and added acidizing to the Company's service offerings.

The following table summarizes the fair value of RTS as of June 15, 2018 (in thousands):

	RTS
Inventory	$	180
Property, plant and equipment	7,787
Goodwill(a)	133
Total assets acquired	$	8,100

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, RTS provided the following activity (in thousands):

	2018
Revenues	$	630
Net income(a)	7

a.    Includes depreciation expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of RTS had occurred as of January 1, 2017 (in thousands):

	Six Months Ended
	June 30, 2018			June 30, 2017
Revenues	$	10,160		$	8,326
Net income (loss)	(848		)	653

The Company recognized a nominal amount of transaction related costs during the three months ended June 30, 2018 related to this acquisition.

(c) Acquisition of 5 Star

On July 1, 2017, the Company completed its acquisition of 5 Star for total consideration of $2.4 million in cash to the sellers. Mammoth funded the purchase price for 5 Star with cash on hand and borrowings under its credit facility. The acquisition of 5 Star added to the infrastructure component of the Company's business.

The Company recognized $0.1 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

The following table summarizes the fair value of 5 Star as of July 1, 2017 (in thousands):

	5 Star
Accounts receivable	$	2,440
Property, plant and equipment	1,863
Identifiable intangible assets - trade names (a)	300
Goodwill (b)	248
Total assets acquired	$	4,851
Long-term debt and other liabilities	$	2,413
Total liabilities assumed	$	2,413
Net assets acquired	$	2,438

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Identifiable intangible assets will be amortized over 10 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, 5 Star provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	86,720	$	25,216
Net income (b)	12,903		4,191

a.Includes intercompany revenues of $77.5 million and $16.0 million, respectively, for 2018 and 2017.

b.Includes depreciation and amortization expense of $1.0 million and $0.8 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of 5 Star had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	6,332
Net loss	(282		)

(d) Acquisition of Higher Power

On April 21, 2017, the Company completed its acquisition of Higher Power for total consideration of $3.3 million in cash to the sellers plus up to $0.8 million in contingent consideration to be paid in equal annual installments over the next three years subject to contractual conditions. As of June 30, 2018, $0.3 million and $0.3 million, respectively, of the contingent consideration are reflected in accrued expenses and other current liabilities and other liabilities on the unaudited condensed consolidated balance sheet. Mammoth funded the purchase price for Higher Power with cash on hand and borrowings under its credit facility. The acquisition of Higher Power added an energy infrastructure component to the Company's business, helping to diversify its service offerings.

The Company recognized $0.1 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

The following table summarizes the fair value of Higher Power as of April 21, 2017 (in thousands):

	Higher Power
Property, plant and equipment	$	1,744
Identifiable intangible assets - customer relationships	1,613
Goodwill (a)	643
Total assets acquired	$	4,000

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

From the acquisition date through June 30, 2018, Higher Power provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	122,734	$	39,571
Net income (b)	16,205		5,127

a.Includes intercompany revenues of $111.4 million and $27.4 million, respectively for 2018 and 2017.

b.Includes depreciation and amortization expense of $2.3 million and $2.0 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of Higher Power had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	4,481
Net loss	(411		)

(e) Acquisition of Sturgeon

On March 20, 2017, and as amended on May 12, 2017, the Company entered into a definitive contribution agreement with MEH Sub, Wexford Offshore Sturgeon Corp., Gulfport, Rhino and Mammoth Energy Partners LLC (the “Sturgeon Contribution Agreement”). Under the Sturgeon Contribution Agreement, the Company agreed to acquire, through its wholly-owned subsidiary Mammoth LLC, all outstanding membership interests in Sturgeon, which owns all of the membership interests in Taylor Frac, Taylor RE and South River (collectively, the "Sturgeon subsidiaries"). The acquisition added sand reserves, increased our production capacity and provided access to the Canadian National Railway, which affords access to the Appalachian basin in support of the Company’s pressure pumping services as well as to western Canada.

The acquisition of Sturgeon closed on June 5, 2017. Pursuant to the Sturgeon Contribution Agreement, Mammoth issued 5,607,452 shares of its common stock for all outstanding equity interests in Sturgeon. Based upon a closing price of Mammoth's common stock of $18.50 per share on June 5, 2017, the total purchase price was $103.7 million.

As a result of this transaction, the Company's historical financial information has been recast to combine the unaudited condensed consolidated statements of operations and the unaudited condensed consolidated balance sheets of the Company for all periods included in the accompanying financial statements with those of Sturgeon as if the combination had been in effect since Sturgeon commenced operations on September 13, 2014. Any material transactions between the Company and Sturgeon were eliminated. Sturgeon's financial results were incorporated into the Company's natural sand proppant services division.

For the year ended December 31, 2017, $1.3 million of transaction related costs were expensed.

(f) Acquisition of Chieftain

On March 27, 2017, as amended as of May 24, 2017, the Company entered into a Purchase Agreement with Chieftain Sand and Proppant, LLC and Chieftain Sand and Proppant Barron, LLC, unrelated third party sellers (the "Chieftain Sellers"), following the Company's successful bid in a bankruptcy court auction for substantially all of the assets of the Chieftain Sellers (the "Chieftain Assets"). This transaction (the "Chieftain Acquisition") closed on May 26, 2017. Mammoth funded the purchase price for the Chieftain Assets with cash on hand and borrowings under its revolving credit facility. The Chieftain Assets are held by the Company's wholly owned subsidiary Piranha and are included in the Company's sand segment. The Chieftain Acquisition added sand reserves, increased our production capacity and provided access to the Union Pacific railroad, which affords access to both the Mid-Continent and Permian basins in support of the Company’s pressure pumping services.

The following table summarizes the fair value of the Chieftain Acquisition as of May 26, 2017 (in thousands):

	Total
Property, plant and equipment (a)	$	23,373
Sand reserves (b)	20,910
Total assets acquired	$	44,283
Asset retirement obligation	1,732
Total liabilities assumed	$	1,732
Total allocation of purchase price	$	42,551
Bargain purchase price (c,d)	(6,231		)
Total purchase price	$	36,320

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. The fair value of the sand reserves was determined based on the excess cash flow method, a form of the income approach. The method provides a value based on the estimated remaining life of sand reserves, projected financial information and industry projections.

c. Amount reflected in unaudited condensed consolidated statements of comprehensive income (loss) reflected net of income taxes of $2.2 million.

d. The fair value of the business was determined based on the excess cash flow method, a form of the income approach.

From the acquisition date through June 30, 2018, the Chieftain Assets provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	35,128	$	22,847
Net income(b)	10,694		5,520

a.Includes intercompany revenues of $9.6 million and $12.3 million, respectively, for 2018 and 2017

b.Includes depreciation, depletion, amortization and accretion of $2.3 million and $2.8 million, respectively, for 2018 and 2017

The following table presents unaudited pro forma information as if the acquisition of the Chieftain Assets had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	1,312
Net loss	(72		)

The Company's historical financial information was adjusted to give pro forma effect to the events that were directly attributable to the Chieftain Acquisition. The Company recognized $0.8 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

(g) Acquisition of Stingray

On March 20, 2017, and as amended on May 12, 2017, the Company entered into two definitive contribution agreements, one such agreement with MEH Sub, Wexford Offshore Stingray Energy Corp., Gulfport and Mammoth LLC and the other with MEH Sub, Wexford Offshore Stingray Pressure Pumping Corp., Gulfport and Mammoth LLC (collectively, the “Stingray Contribution Agreements”). Under the Stingray Contribution Agreements, the Company agreed to acquire, through its wholly-owned subsidiary Mammoth LLC, all outstanding membership interests in Stingray Cementing LLC ("Cementing") and Stingray Energy Services LLC ("SR Energy") (the “2017 Stingray Acquisition”). The addition of their water transfer, equipment rentals and cementing services further expanded and vertically integrated Mammoth’s service offerings.

The 2017 Stingray Acquisition closed on June 5, 2017. Pursuant to the Stingray Contribution Agreements, Mammoth issued 1,392,548 shares of its common stock for all outstanding equity interests in SR Energy and Cementing. Based upon a closing price of Mammoth's common stock of $18.50 per share on June 5, 2017, the total purchase price was $25.8 million.

The following tables summarize the fair values of Cementing and SR Energy as of June 5, 2017 (in thousands):

Consideration attributable to Cementing (a)	$	12,975
Consideration attributable to SR Energy (a)	12,787
Total consideration transferred	$	25,762

a.    See Summary of acquired assets and liabilities below

	SR Energy		Cementing		Total
	(in thousands)
Cash and cash equivalents	$	1,611	$	1,060	$	2,671
Accounts receivable, net	3,913		495		4,408
Receivables from related parties	3,684		1,418		5,102
Inventories	—		306		306
Prepaid expenses	35		32		67
Property, plant and equipment(a)	13,061		7,459		20,520
Identifiable intangible assets - customer relationships(b)	—		1,140		1,140
Identifiable intangible assets - trade names(b)	550		270		820
Goodwill(c)	3,929		6,264		10,193
Other assets	7		—		7
Total assets acquired	$	26,790	$	18,444	$	45,234
Accounts payable and accrued liabilities	$	5,890	$	2,063	$	7,953
Long-term debt (d)	5,074		2,000		7,074
Deferred tax liability	3,039		1,406		4,445
Total liabilities assumed	$	14,003	$	5,469	$	19,472
Net assets acquired	$	12,787	$	12,975	$	25,762

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 5-10 years.

c. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforces and future profitability expected to arise from the acquired entities.

d. Long-term debt assumed was paid off subsequent to the acquisitions.

From the acquisition date through June 30, 2018, SR Energy and Cementing provided the following activity (in thousands):

	2018						2017
	SR Energy			Cementing			SR Energy			Cementing
Revenues(a)	$	16,034		$	5,131		$	11,572		$	7,500
Net loss(b)	(1,586		)	(806		)	(1,626		)	(1,963		)

a. Includes intercompany revenues of $1.6 million and $0.6 million for SR Energy in 2018 and 2017.

b. Includes depreciation and amortization expense of $2.8 million and $1.0 million, respectively, for SR Energy and Cementing in 2018 and $3.4 million and $4.1 million, respectively, for SR Energy and Cementing in 2017.

The following table presents unaudited pro forma information as if the acquisition of SR Energy and Cementing had occurred on January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	18,333
Net loss	(1,612		)

The historical financial information was adjusted to give effect to the pro forma events that were directly attributable to the 2017 Stingray Acquisition. The unaudited pro forma consolidated results are not necessarily indicative of what the consolidated results of operations actually would have been had the 2017 Stingray Acquisition been completed on January 1, 2017. In addition, the unaudited pro forma consolidated results do not purport to project the future results of operations of the Company. The Company recognized $0.2 million of transaction related costs during the year ended December 31, 2017 related to this acquisition.

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Inventories

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventory consists of raw sand and processed sand available for sale, chemicals and other products sold as a bi-product of completion and production operations and supplies used in performing services. Inventory is stated at the lower of cost or market (net realizable value) on an average cost basis. The Company assesses the valuation of its inventories based upon specific usage and future utility. A summary of the Company's inventories is shown below (in thousands):

	June 30,		December 31,
	2018		2017
Supplies	$	7,264	$	9,437
Raw materials	321		219
Work in process	1,326		2,370
Finished goods	3,806		5,788
Total inventory	$	12,717	$	17,814

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Property, Plant and Equipment

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment     

Property, plant and equipment include the following (in thousands):

		June 30,		December 31,
	Useful Life	2018		2017
Pressure pumping equipment	3-5 years	$	199,333	$	190,211
Drilling rigs and related equipment	3-15 years	137,075		132,260
Machinery and equipment(a)	7-20 years	140,308		97,569
Buildings	15-39 years	47,593		45,992
Vehicles, trucks and trailers(b)	5-10 years	91,680		54,055
Coil tubing equipment	4-10 years	28,068		28,053
Land	N/A	14,183		11,317
Land improvements	15 years or life of lease	9,614		9,614
Rail improvements	10-20 years	13,101		5,540
Other property and equipment	3-12 years	15,006		12,687
		695,961		587,298
Deposits on equipment and equipment in process of assembly		33,349		20,348
		729,310		607,646
Less: accumulated depreciation(c)		305,995		256,629
Property, plant and equipment, net		$	423,315	$	351,017

a. Included in machinery and equipment are assets under capital leases totaling $1.8 million and $1.8 million, respectively, at June 30, 2018 and December 31, 2017.

b. Included in vehicles, trucks and trailers are assets under capital leases totaling $3.8 million and $1.0 million, respectively, at June 30, 2018 and December 31, 2017.

c. Accumulated depreciation for assets under capital leases totaled $0.9 million and $0.8 million, respectively, at June 30, 2018 and December 31, 2017.

Proceeds from customers for horizontal and directional drilling services equipment damaged or lost down-hole are reflected in revenue with the carrying value of the related equipment charged to cost of service revenues and are reported as cash inflows from investing activities in the statement of cash flows. For the six months ended June 30, 2018 and 2017, proceeds from the sale of equipment damaged or lost down-hole were $0.6 million and $0.3 million, respectively, and gains on sales of equipment damaged or lost down-hole were $0.5 million and $0.2 million, respectively.

A summary of depreciation, depletion, amortization and accretion expense is below (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Depreciation expense(a)	$	27,058	$	17,229	$	51,456	$	32,196
Depletion expense	1,340		382		1,427		384
Amortization expense	2,382		2,268		4,790		4,536
Accretion expense	15		14		30		14
Depreciation, depletion, amortization and accretion	$	30,795	$	19,893	$	57,703	$	37,130

a. Includes depreciation expense for assets under capital leases totaling $0.4 million and $0.2 million, respectively, for the six months ended June 30, 2018 and 2017.

Deposits on equipment and equipment in process of assembly represents deposits placed with vendors for equipment that is in the process of assembly and purchased equipment that is being outfitted for its intended use. The equipment is not yet placed in service.

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Intangible Assets and Goodwill

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Intangible Assets and Goodwill

The Company had the following definite lived intangible assets recorded (in thousands):

	June 30,			December 31,
	2018			2017
Customer relationships	$	36,725		$	35,795
Trade names	9,443			8,793
Less: accumulated amortization - customer relationships	(30,521		)	(26,172		)
Less: accumulated amortization - trade names	(2,717		)	(2,277		)
Intangible assets, net	$	12,930		$	16,139

Amortization expense for intangible assets was $4.8 million and $4.5 million, respectively, for the six months ended June 30, 2018 and 2017. The original life of customer relationships ranges from 4 to 10 years with a remaining average useful life of 3.9 years. The original life of trade names ranges from 10 to 20 years with a remaining average useful life of 9.1 years.

Aggregated expected amortization expense for the future periods is expected to be as follows (in thousands):

	Amount
Remainder of 2018	$	3,969
2019	1,293
2020	1,293
2021	1,288
2022	1,266
Thereafter	3,821
	$	12,930

Goodwill was $101.5 million and $99.8 million, respectively, at June 30, 2018 and December 31, 2017. Changes in the goodwill for the year ended December 31, 2017 and the six months ended June 30, 2018 are set forth below (in thousands):

Balance, January 1, 2017	$	88,727
Additions - 2017 Stingray Acquisition (Note 4)	10,193
Additions - Higher Power Acquisition (Note 4)	643
Additions - 5 Star Acquisition (Note 4)	248
Balance, December 31, 2017	99,811
Additions - WTL Acquisition (Note 4)	1,567
Additions - RTS Acquisition (Note 4)	133
Balance, June 30, 2018	$	101,511

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Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2018

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities

Accrued expense and other current liabilities included the following (in thousands):

	June 30,		December 31,
	2018		2017
Deferred revenue	15,100		15,210
Accrued compensation, benefits and related taxes	19,917		11,552
Financed insurance premiums	1,638		4,876
Insurance reserves	4,183		2,942
State and local taxes payable	8,205		2,126
Other	5,658		4,189
Total	$	54,701	$	40,895

Financed insurance premiums are due in monthly installments, are unsecured and mature within the twelve month period following the close of the year. As of June 30, 2018 and December 31, 2017, the applicable interest rate associated with financed insurance premiums was 2.75%.

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Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

Mammoth Credit Facility

On November 25, 2014, Mammoth entered into a revolving credit and security agreement with a syndicate of banks that provides for maximum borrowings of $170 million. The facility, as amended, matures on November 25, 2019. Borrowings under this facility are secured by the assets of Mammoth, inclusive of the subsidiary companies. The maximum availability of the facility is subject to a borrowing base calculation prepared monthly. Concurrent with the execution of the facility, the initial advance was used to repay all the debt of the Company then outstanding. Interest is payable monthly at a base rate set by the lead institution’s commercial lending group plus an applicable margin. Additionally, at the Company's request, outstanding balances are permitted to be converted to LIBOR rate plus applicable margin tranches at set increments of $0.5 million. The LIBOR rate option allows the Company to select interest periods from one, two, three or six months. The applicable margin for either the base rate or the LIBOR rate option can vary from 1.5% to 3.0%, based upon a calculation of the excess availability of the line as a percentage of the maximum credit limit. The deferred loan costs associated with this facility are classified in other non-current assets.

At June 30, 2018, there were no outstanding borrowings under the credit facility and $162.7 million of available borrowing capacity, after giving effect to $6.5 million of outstanding letters of credit. At December 31, 2017, there were outstanding borrowings under the credit facility of $99.9 million, leaving an aggregate of $62.8 million of borrowing capacity under the facility, after giving effect to $6.5 million of outstanding letters of credit.

The Mammoth facility also contains various customary affirmative and restrictive covenants. Among the various covenants are specifically identified financial covenants placing requirements of a minimum interest coverage ratio (3.0 to 1.0), maximum leverage ratio (4.0 to 1.0), and minimum availability ($10 million). As of June 30, 2018 and December 31, 2017, the Company was in compliance with the financial covenants under the facility.

Sturgeon Credit Facility

On June 30, 2015, Sturgeon entered in to a three-year $25.0 million revolving line of credit secured by substantially all of the assets of Sturgeon (“the Sturgeon revolver”). Advances under the Sturgeon revolver bore interest at 2% plus the greater of (a) the Base Rate as set by the lender's commercial lending group, (b) the sum of the Federal Funds Open Rate plus one half of one percent and (c) the sum of the Daily LIBOR rate. Additionally, at Sturgeon’s request, advances could be obtained at LIBOR plus 3%. The LIBOR rate option allowed Sturgeon to select interest periods from one, two, three or six month LIBOR futures spot rates. The Sturgeon revolver was terminated on June 6, 2017.

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Other Liabilities

6 Months Ended

Jun. 30, 2018

Other Liabilities Disclosure [Abstract]

Other Liabilities

Other Liabilities

Other liabilities included the following (in thousands):

	June 30,			December 31,
	2018			2017
Capital lease obligations	$	4,253		$	2,015
Equipment financing arrangement	1,436			1,605
Other	250			500
Total	5,939			4,120
Less: Current portion of capital lease and equipment financing obligations included in accrued expenses and other current liabilities	(1,839		)	(831		)
Total Other Liabilities	$	4,100		$	3,289

The Company leases vehicles and other equipment under capital leases with varying terms and expiration dates through 2020. The weighted average implied interest rate under our capital leases as of June 30, 2018 and December 31, 2017 was 14.2% and 19.1%, respectively. Additionally, the Company entered into a five-year equipment financing arrangement maturing in 2022 that bears interest at 4.6% as of June 30, 2018. Principal and interest on capital leases and the equipment financing arrangement are paid monthly. Aggregate future payments under the Company's non-cancelable capital leases and equipment financing arrangement as of June 30, 2018 are as follows (in thousands):

2018	$	890
2019	2,593
2020	1,696
2021	664
2022	360
Total future minimum payments	6,203
Less interest payments	(514		)
Present value of future minimum payments	$	5,689

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Variable Interest Entity

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entity

Variable Interest Entity

On April 6, 2018, Dire Wolf Energy Services LLC ("Dire Wolf"), a wholly owned subsidiary of the Company, entered into a Voting Trust Agreement with TVPX Aircraft Solutions Inc. (the "Voting Trustee"). Under the Voting Trust Agreement, Dire Wolf transferred 100% of its membership interest in Cobra Aviation Services LLC ("Cobra Aviation") to the Voting Trustee in exchange for Voting Trust Certificates. Dire Wolf retained the obligation to absorb all expected returns or losses of Cobra Aviation. Prior to the transfer of membership interest to the Voting Trustee, Cobra Aviation was a wholly owned subsidiary of Dire Wolf. Cobra Aviation owns and operates a helicopter primarily for services provided to Cobra Acquisitions, a wholly owned subsidiary of the Company. Dire Wolf entered into the Voting Trust Agreement in order to meet certain registration requirements.

Dire Wolf's voting rights are not proportional to its obligation to absorb expected returns or losses of Cobra Aviation and all of Cobra Aviation's activities are conducted on behalf of Dire Wolf, which has disproportionately fewer voting rights; therefore, Cobra Aviation meets the criteria of a VIE. Cobra Aviation's operational activities are directed by Dire Wolf's officers and Dire Wolf has the option to terminate the Voting Trust Agreement at any time. Therefore, the Company, through Dire Wolf, is considered the primary beneficiary of the VIE and consolidates Cobra Aviation at June 30, 2018.

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Selling, General And Administrative Expense

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Selling, General and Administrative Expense

Selling, General and Administrative Expense

Selling, general and administrative ("SG&A") expense includes of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cash expenses:
Compensation and benefits	$	10,978	$	2,966	$	18,677	$	5,381
Professional services	2,981		1,652		5,568		3,581
Other(a)	3,935		2,015		5,542		3,880
Total cash SG&A expense	17,894		6,633		29,787		12,842
Non-cash expenses:
Bad debt provision	28,263		17		53,790		(25		)
Equity based compensation(b)	17,487		—		17,487		—
Stock based compensation	1,483		1,050		2,574		1,620
Total non-cash SG&A expense	47,233		1,067		73,851		1,595
Total SG&A expense	$	65,127	$	7,700	$	103,638	$	14,437

a. Includes travel-related costs, IT expenses, rent, utilities and other general and administrative-related costs.

b. Represents compensation expense for non-employee awards, which were issued and are payable by certain affiliates of Wexford (the sponsor level). See Note 15 for additional detail.

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The components of income tax expense (benefit) attributable to the Company for the three and six months ended June 30, 2018 and 2017, are as follows (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Foreign current income tax expense	$	67,665		$	21		$	125,712		$	606
Foreign deferred income tax benefit	(15,266		)	(14		)	(25,386		)	(20		)
U.S. current income tax expense	1,636			—			1,624			—
U.S. deferred income tax benefit	(523		)	(2,811		)	(2,520		)	(6,496		)
Total	$	53,512		$	(2,804	)	$	99,430		$	(5,910	)

The Company's effective tax rate was 50% and 37%, respectively, for the six months ended June 30, 2018 and 2017. The increase in the effective tax rate is primarily due to the equity based compensation expense recognized during the six months ended June 30, 2018 as well as a higher tax rate in Puerto Rico, where most of our income was generated during the six months ended June 30, 2018, compared to the United States tax rate. No income was generated in Puerto Rico during the six months ended June 30, 2017. Additionally, the Company's effective tax rate can fluctuate as a result of, among other things, discrete items, state income taxes, permanent differences and changes in pre-tax income.

A valuation allowance for deferred tax assets is recognized when it is more likely than not that the benefit of deferred tax assets will not be realized. To assess that likelihood, the Company uses estimates and judgments regarding future taxable income, as well as the jurisdiction in which such taxable income is generated, to determine whether a valuation allowance is required. During the six months ended June 30, 2018, the Company recorded a change in valuation allowance of $9.2 million related to foreign tax credits that are not expected to be utilized.

On December 22, 2017, the United States enacted the Tax Cuts and Jobs Act (the “Tax Act”). As a result, the Company recorded a provisional amount for effects of the Tax Act totaling $31.0 million during the fourth quarter of 2017. The Company continues to evaluate the impact of the Tax Act and no revisions were recorded to the provisional amount during the six months ended June 30, 2018. The Company expects to complete its detailed analysis of the effects of the Tax Act no later than the fourth quarter of 2018.

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Earnings (Loss) Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Earnings (Loss) Per Share

Reconciliations of the components of basic and diluted net income (loss) per common share are presented in the table below (in thousands, except per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018		2017
Basic earnings (loss) per share:
Allocation of earnings:
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares outstanding	44,737		39,500			44,700		38,506
Basic earnings (loss) per share	$	0.95	$	(0.03	)	$	2.20	$	(0.16	)
Diluted earnings (loss) per share:
Allocation of earnings (loss):
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares, including dilutive effect (a)	45,059		39,500			44,977		38,506
Diluted earnings (loss) per share	$	0.95	$	(0.03	)	$	2.18	$	(0.16	)

^a.  No incremental shares of potentially dilutive restricted stock awards were included for the three and six months ended June 30, 2017 as their effect was antidulitive under the treasury stock method.

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Equity Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity Based Compensation

Equity Based Compensation

Upon formation of certain operating entities by Wexford, Gulfport and Rhino, specified members of management (the “Specified Members”) and certain non-employee members (the “Non-Employee Members”) were granted the right to receive distributions from the operating entities after the contribution member’s unreturned capital balance was recovered (referred to as “Payout” provision).

On November 24, 2014, the awards were modified in conjunction with the contribution of the operating entities to Mammoth. These awards were not granted in limited or general partner units. The awards are for interests in the distributable earnings of the members of MEH Sub, Mammoth’s majority equity holder.

On the IPO closing date, the unreturned capital balance of Mammoth's majority equity holder was not fully recovered from its sale of common stock in the IPO. As a result, Payout did not occur and no compensation cost was recorded.

On June 29, 2018, as part of an underwritten secondary public offering, MEH Sub sold 2,764,400 shares of the Company’s common stock at a purchase price to MEH Sub of $38.01 per share. MEH Sub received the proceeds from this offering. As a result, a portion of the Non-Employee Member awards reached Payout. During the three months ended June 30, 2018, the Company recognized equity compensation expense totaling $17.5 million related to these non-employee awards. These awards are at the sponsor level and this transaction had no dilutive impact or cash impact to the Company.

Payout for the remaining awards is expected to occur following additional sales by MEH Sub of its shares of the Company's common stock, which is considered not probable until the event occurs. For the Specified Member awards, the unrecognized amount, which represents the fair value of the award as of the modification dates or grant date, was $5.6 million. For the Non-Employee Member awards, the unrecognized amount, which represents the fair value of the awards as of June 30, 2018 was $43.1 million.

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Stock Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Based Compensation

Stock Based Compensation

The 2016 Plan authorizes the Company's Board of Directors or the compensation committee of the Company's Board of Directors to grant restricted stock, restricted stock units, stock appreciation rights, stock options and performance awards. There are 4.5 million shares of common stock reserved for issuance under the 2016 Plan.

Restricted Stock Units

The fair value of restricted stock unit awards was determined based on the fair market value of the Company's common stock on the date of the grant. This value is amortized over the vesting period.

A summary of the status and changes of the unvested shares of restricted stock under the 2016 Plan is presented below.

	Number of Unvested Restricted Shares		Weighted Average Grant-Date Fair Value
Unvested shares as of January 1, 2018	640,632		$	19.44
Granted	93,556		26.83
Vested	(149,098	)	21.29
Forfeited	—		—
Unvested shares as of June 30, 2018	585,090		$	21.07

As of June 30, 2018, there was $9.2 million of total unrecognized compensation cost related to the unvested restricted stock. The cost is expected to be recognized over a weighted average period of approximately 1.8 years.

Included in cost of revenue and selling, general and administrative expenses is stock based compensation expense of $1.7 million and $1.1 million, respectively, for the three months ended June 30, 2018 and 2017 and $2.9 million and $1.6 million, respectively, for the six months ended June 30, 2018 and 2017.

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Related Party Transactions

6 Months Ended

Jun. 30, 2018

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Transactions between the subsidiaries of the Company and the following companies are included in Related Party Transactions: Gulfport; Grizzly Oil Sands ULC (“Grizzly”); El Toro Resources LLC (“El Toro”); Cementing and SR Energy (collectively, prior to the 2017 Stingray Acquisition, the “2017 Stingray Companies”); Everest Operations Management LLC (“Everest”); Elk City Yard LLC (“Elk City Yard”); Double Barrel Downhole Technologies LLC (“DBDHT”); Caliber Investment Group LLC (“Caliber”); Dunvegan North Oilfield Services ULC (“Dunvegan”); Predator Drilling LLC (“Predator”); and T&E Flow Services LLC (“T&E”).

Following is a summary of related party transactions (in thousands):

		REVENUES								ACCOUNTS RECEIVABLE
		Three Months Ended June 30,				Six Months Ended June 30,				At June 30,			At December 31,
		2018		2017		2018		2017		2018			2017
Pressure Pumping and Gulfport	(a)	$	33,831	$	41,100	$	72,377	$	72,845	$	20,127		$	25,054
Muskie and Gulfport	(b)	9,730		13,605		21,192		25,145		4,428			1,947
Panther Drilling and Gulfport	(c)	—		952		56		1,994		12			872
Cementing and Gulfport	(d)	2,048		903		4,876		903		1,739			2,255
SR Energy and Gulfport	(e)	4,626		1,565		11,579		1,565		4,292			3,348
Panther Drilling and El Toro	(f)	—		—		345		—		—			—
Redback Energy and El Toro	(g)	92		34		92		158		—			—
Coil Tubing and El Toro	(h)	—		—		360		—		(2		)	—
Bison Drilling and Predator	(i)	—		—		—		—		—			234
Other Relationships		14		49		14		100		78			78
		$	50,341	$	58,208	$	110,891	$	102,710	$	30,674		$	33,788

a. Pressure Pumping provides pressure pumping, stimulation and related completion services to Gulfport.

b. Muskie has agreed to sell and deliver, and Gulfport has agreed to purchase, specified annual and monthly amounts of natural sand proppant, subject to certain exceptions specified in the agreement, and pay certain costs and expenses.

c. Panther Drilling performs drilling services for Gulfport pursuant to a master service agreement.

d. Cementing performs well cementing services for Gulfport.

e. SR Energy performs rental services for Gulfport.

f. Panther provides services for El Toro, an entity controlled by Wexford, pursuant to a master service agreement.

g. Redback Energy performs completion and production services for El Toro pursuant to a master service agreement.

h. Coil Tubing provides to El Toro services in connection with completion and drilling activities.

i. Bison Drilling provides equipment rentals to Predator, an entity in which Wexford owns a minority interest.

		Three Months Ended June 30,					Six Months Ended June 30,				At June 30,		At December 31,
		2018			2017		2018		2017		2018		2017
		COST OF REVENUE					COST OF REVENUE				ACCOUNTS PAYABLE
Cobra and T&E	(a)	$	1,486		$	—	$	2,762	$	—	$	289	$	457
Higher Power and T&E	(a)	950			—		1,458		—		576		3
Panther and DBDHT	(b)	—			—		—		128		—		77
The Company and 2017 Stingray Companies	(c)	—			207		—		444		—		—
Other		(8		)	55		—		120		—		218
		$	2,428		$	262	$	4,220	$	692	$	865	$	755
		SELLING, GENERAL AND ADMINISTRATIVE COSTS					SELLING, GENERAL AND ADMINISTRATIVE COSTS
The Company and Everest	(d)	$	55		$	50	$	86	$	108	$	6	$	19
The Company and Wexford	(e)	290			165		473		398		78		150
The Company and Caliber	(f)	145			72		346		72		47		1
Other		42			20		56		53		—		2
		$	532		$	307	$	961	$	631	$	131	$	172
		CAPITAL EXPENDITURES					CAPITAL EXPENDITURES
Cobra and T&E	(a)	$	757		$	—	$	1,131	$	—	$	170	$	66
Higher Power and T&E	(a)	1,575			—		2,773		—		750		385
		$	2,332		$	—	$	3,904	$	—	$	920	$	451
											$	1,916	$	1,378

a. Cobra and Higher Power purchase materials and services from T&E, an entity in which a member of management's family owns a minority interest.

b. Panther rents rotary steerable equipment in connection with its directional drilling services from DBDHT.

c. Prior to the 2017 Stingray Acquisition, the 2017 Stingray Companies provided certain services to the Company and, from time to time, the 2017 Stingray Companies paid for goods and services on behalf of the Company.

d. Everest has historically provided office space and certain technical, administrative and payroll services to the Company and the Company has reimbursed Everest in amounts determined by Everest based on estimates of the amount of office space provided and the amount of employees’ time spent performing services for the Company.

e. Wexford provides certain administrative and analytical services to the Company and, from time to time, the Company pays for goods and services on behalf of Wexford.

f. Caliber leases office space to Mammoth.

On June 29, 2018, Gulfport and certain entities controlled by Wexford (the "Selling Stockholders") completed an underwritten secondary public offering of 4,000,000 shares of the Company’s common stock at a purchase price to the Selling Stockholders of $38.01 per share. The Selling Stockholders received all proceeds from this offering. The Company incurred costs of approximately $0.7 million related to the secondary public offering during the three months ended June 30, 2018.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Lease Obligations

The Company leases real estate, rail cars and other equipment under long-term operating leases with varying terms and expiration dates through 2062.

Minimum Purchase Commitments

The Company has entered into agreements with suppliers that contain minimum purchase obligations. Failure to purchase the minimum amounts may require the Company to pay shortfall fees. However, the minimum quantities set forth in the agreements are not in excess of currently expected future requirements.

Capital Spend Commitments

The Company has entered into agreements with suppliers to acquire capital equipment.

Aggregate future minimum payments under these obligations in effect at June 30, 2018 are as follows (in thousands):

Year ended December 31:	Operating Leases		Capital Spend Commitments		Minimum Purchase Commitments
Remainder of 2018	$	12,148	$	16,393	$	19,254
2019	18,091		—		12,125
2020	15,622		—		400
2021	12,029		—		165
2022	8,995		—		—
Thereafter	6,057		—		—
	$	72,942	$	16,393	$	31,944

For the six months ended June 30, 2018 and 2017, the Company recognized rent expense of $10.2 million and $4.2 million, respectively.

The Company has various letters of credit that were issued under the Company's revolving credit agreement which is collateralized by substantially all of the assets of the Company. The letters of credit are categorized below (in thousands):

	June 30,		December 31,
	2018		2017
Environmental remediation	$	3,582	$	3,582
Insurance programs	2,486		2,486
Rail car commitments	455		455
Total letters of credit	$	6,523	$	6,523

The Company has insurance coverage for physical partial loss to its assets, employer’s liability, automobile liability, commercial general liability, workers’ compensation and insurance for other specific risks. The Company has also elected in some cases to accept a greater amount of risk through increased deductibles on certain insurance policies. As of June 30, 2018 and December 31, 2017, the policies require a deductible per occurrence of up to $0.3 million. The Company establishes liabilities for the unpaid deductible portion of claims incurred relating to physical loss to its assets, employer's liability, automobile liability, commercial general liability and workers’ compensation based on estimates. As of June 30, 2018 and December 31, 2017, the policies contained an aggregate stop loss of $2.0 million. The Company also self-insures its employee health insurance. The Company has coverage on its self-insurance program in the form of a stop loss of $0.2 million per participant and an aggregate stop-loss of $5.8 million for the calendar year ending December 31, 2018. These estimates may change in the near term as actual claims continue to develop. As of June 30, 2018 and December 31, 2017, accrued insurance claims were $4.2 million and $2.9 million, respectively.

Pursuant to certain customer contracts in our infrastructure services segment, the Company warrants equipment and labor performed under the contracts for a specified period following substantial completion of the work. Generally, the warranty is for one year or less. No liabilities were accrued as of June 30, 2018 and December 31, 2017 and no expense was recognized during the six months ended June 30, 2018 or 2017 related to warranty claims. However, if warranty claims occur, the Company could be required to repair or replace warrantied items, which in most cases are covered by warranties extended from the manufacturer of the equipment. In the event the manufacturer of equipment failed to perform on a warranty obligation or denied a warranty claim made by the Company, the Company could be required to pay for the cost of the repair or replacement.

In the ordinary course of business, the Company is required to provide bid bonds to certain customers in the infrastructure services segment as part of the bidding process. These bonds provide a guarantee to the customer that the Company, if awarded the project, will perform under the terms of the contract. Bid bonds are typically provided for a percentage of the total contract value. Additionally, the Company may be required to provide performance and payment bonds for contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it incurs. As of June 30, 2018, outstanding bid bonds and performance and payment bonds totaled $1.1 million and $1.6 million, respectively. The estimated the cost to complete projects secured by the performance and payment bonds totaled $0.6 million as of June 30, 2018. As of December 31, 2017, the Company did not have any outstanding bid bonds or performance and payment bonds.

The Company is routinely involved in state and local tax audits. During 2015, the State of Ohio assessed taxes on the purchase of equipment the Company believes is exempt under state law. The Company appealed the assessment and a hearing was held in 2017. As a result of the hearing, the Company received a decision from the State of Ohio. The Company is appealing the decision and while it is not able to predict the outcome of the appeal, this matter is not expected to have a material adverse effect on the Company's financial position, results of operations or cash flows.

On August 1, 2016, a putative class and collective action lawsuit alleging that Redback Energy failed to pay a class of workers overtime in compliance with the Fair Labor Standards Act and Texas law was filed titled Michael Caffey, individually and on behalf of all others similarly situated v. Redback Energy Services LLC in the U.S. District Court for the Western District of Texas. The parties reached a settlement of this matter in April 2017. The settlement was paid and did not have a material impact on the Company's financial position, results of operations or cash flows.

On January 26, 2017, a collective action lawsuit alleging that Stingray Pressure Pumping LLC ("Pressure Pumping") failed to pay a class of workers in compliance with the Fair Labor Standards Act was filed titled Ryan Crosby vs. Stingray Pressure Pumping LLC, in the United Stated District Court for the Southern District of Ohio Eastern Division. The Company is evaluating the background facts at this time and is not able to predict the outcome of this lawsuit or whether it will have a material impact on the Company’s financial position, results of operations or cash flows.

On June 27, 2017, a complaint alleging negligence, as a result of a motor vehicle accident, was filed titled Donnelle Banks, individually and as parent and next Friend for Leila Ann Hollis, a minor, vs. Redback Coil Tubing LLC and Mammoth Energy Services, Inc. in the District Court of Gregg County, Texas. This matter is covered by insurance and did not have a material impact on the Company’s financial position, results of operations or cash flows.

On June 27, 2018, the Company's registered agent notified the Company that it had been served with a putative class action lawsuit titled Wendco of Puerto Rico Inc.; Multisystem Restaurant Inc.; Restaurant Operators Inc.; Apple Caribe, Inc.; on their own behalf and in representation of all businesses that conduct business in the Commonwealth of Puerto Rico vs. Mammoth Energy Services Inc.; Cobra Acquisitions, LLC; D. Grimm Puerto Rico, LLC; Aseguradoras A, B & C; John Doe; Richard Doe, in the Commonwealth of Puerto Rico Superior Court of San Juan. The plaintiffs allege negligent acts by the defendants caused an electrical failure in Puerto Rico resulting in damages of at least $300 million. The Company believes this claim is without merit and will vigorously defend the action. However, the Company continues to evaluate the background facts and at this time is not able to predict the outcome of this lawsuit or whether it will have a material impact on the Company's financial position, results of operations or cash flows.

The Company is involved in various other legal proceedings in the ordinary course of business. Although the Company cannot predict the outcome of these proceedings, legal matters are subject to inherent uncertainties and there exists the possibility that the ultimate resolution of these matters could have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

Defined contribution plan

The Company sponsors a 401(k) defined contribution plan for the benefit of substantially all employees at their date of hire. The plan allows eligible employees to contribute up to 92% of their annual compensation, not to exceed annual limits established by the federal government. The Company makes discretionary matching contributions of up to 3% of an employee’s compensation and may make additional discretionary contributions for eligible employees. For the three and six months ended June 30, 2018, the Company paid $1.8 million and $3.4 million, respectively, in contributions to the plan. The Company did not make contributions to the plan during the three and six months ended June 30, 2017.

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Reporting Segments

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Reporting Segments

Reporting Segments

As of June 30, 2018, our revenues, income before income taxes and identifiable assets are primarily attributable to four reportable segments. The Company principally provides energy services in connection with on-shore drilling of oil and natural gas wells for small to large domestic independent oil and natural gas producers and electric infrastructure services to government-funded utilities, private utilities, public investor-owned utilities and co-operative utilities.

The Company's Chief Executive Officer and Chief Financial Officer comprise the Company's Chief Operating Decision Maker function ("CODM"). Segment information is prepared on the same basis that the CODM manages the segments, evaluates the segment financial statements and makes key operating and resource utilization decisions. Segment evaluation is determined on a quantitative basis based on a function of operating income (loss), as well as a qualitative basis, such as nature of the product and service offerings and types of customers.

As of June 30, 2018, the Company’s four reportable segments include pressure pumping services ("Pressure Pumping"), infrastructure services ("Infrastructure"), natural sand proppant services ("Sand") and contract land and directional drilling services ("Drilling").

The pressure pumping services segment provides hydraulic fracturing services primarily in the Utica Shale of Eastern Ohio, Marcellus Shale in Pennsylvania, Permian Basin in Texas and the mid-continent region in Oklahoma. The infrastructure services segment provides electric utility infrastructure services to government-funded utilities, private utilities, public investor-owned utilities and co-operative utilities in Puerto Rico and the northeast, southwest and midwest portions of the United States. The sand segment mines, processes and sells sand for use in hydraulic fracturing. The sand segment primarily services the Utica Shale, Permian Basin, SCOOP, STACK and Montney Shale in British Columbia and Alberta, Canada. The contract land and directional drilling services segment provides vertical, horizontal and directional drilling services primarily in the Permian Basin in West Texas.

The Company also provides coil tubing services, pressure control services, flowback services, cementing services, equipment rental services, crude oil hauling services and remote accommodation services. The businesses that provide these services are distinct operating segments, which the CODM reviews independently when making key operating and resource utilization decisions. None of these operating segments meet the quantitative thresholds of a reporting segment and do not meet the aggregation criteria set forth in ASC 280 Segment Reporting. Therefore, results for these operating segments are included in the column labeled "All Other" in the tables below. Additionally, assets for corporate activities, which primarily include cash and cash equivalents, inter-segment accounts receivable, prepaid insurance and certain property and equipment, are included in the All Other column. Although Mammoth LLC, which holds these corporate assets, meets one of the quantitative thresholds of a reporting segment, it does not engage in business activities from which it may earn revenues and its results are not regularly reviewed by the Company's CODM when making key operating and resource utilization decisions. Therefore, the Company does not include it as a reportable segment.

Sales from one segment to another are generally priced at estimated equivalent commercial selling prices. Total revenue and Total cost of revenue amounts included in the Eliminations column in the following tables include inter-segment transactions conducted between segments. Receivables due for sales from one segment to another and for corporate allocations to each segment are included in the Eliminations column for Total assets in the following tables. All transactions conducted between segments are eliminated in consolidation. Transactions conducted by companies within the same reporting segment are eliminated within each reporting segment. The following tables set forth certain financial information with respect to the Company’s reportable segments (in thousands):

Three months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	100,333		$	360,250	$	37,439	$	17,126		$	18,446		$	—		$	533,594
Intersegment revenues	1,073			—		15,406		84			1,721			(18,284		)	—
Total revenue	101,406			360,250		52,845		17,210			20,167			(18,284		)	533,594
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	61,593			210,189		35,117		15,280			17,649			—			339,828
Intersegment cost of revenues	16,174			754		1,019		(40		)	129			(18,036		)	—
Total cost of revenue	77,767			210,943		36,136		15,240			17,778			(18,036		)	339,828
Selling, general and administrative	20,822			39,786		1,787		1,591			1,141			—			65,127
Depreciation, depletion, amortization and accretion	13,829			4,094		3,881		5,349			3,642			—			30,795
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(11,012		)	105,427		11,041		(5,157		)	(2,394		)	(248		)	97,657
Interest expense, net	341			106		76		265			171			—			959
Other expense	80			330		36		32			8			—			486
Income (loss) before income taxes	$	(11,433	)	$	104,991	$	10,929	$	(5,454	)	$	(2,573	)	$	(248	)	$	96,212

Three months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	49,924	$	1,709		$	24,000		$	12,472		$	10,157		$	—		$	98,262
Intersegment revenues	272		—			762			—			85			(1,119		)	—
Total revenue	50,196		1,709			24,762			12,472			10,242			(1,119		)	98,262
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	35,826		1,626			19,974			12,033			7,881			—			77,340
Intersegment cost of revenues	847		—			267			—			5			(1,119		)	—
Total cost of revenue	36,673		1,626			20,241			12,033			7,886			(1,119		)	77,340
Selling, general and administrative	2,403		307			2,416			1,435			1,139			—			7,700
Depreciation, depletion, amortization and accretion	9,626		340			2,206			4,974			2,747			—			19,893
Operating income (loss)	1,494		(564		)	(101		)	(5,970		)	(1,530		)	—			(6,671		)
Interest expense, net	303		4			353			440			12			—			1,112
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	4		—			140			60			(1		)	—			203
Income (loss) before income taxes	$	1,187	$	(568	)	$	3,418		$	(6,470	)	$	(1,541	)	$	—		$	(3,974	)

Six months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	196,912		$	685,709	$	73,942	$	32,354		$	38,926		$	—		$	1,027,843
Intersegment revenues	5,632			—		29,918		86			4,136			(39,772		)	—
Total revenue	202,544			685,709		103,860		32,440			43,062			(39,772		)	1,027,843
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	128,205			404,265		68,447		29,755			35,257			—			665,929
Intersegment cost of revenues	31,576			2,545		5,305		122			234			(39,782		)	—
Total cost of revenue	159,781			406,810		73,752		29,877			35,491			(39,782		)	665,929
Selling, general and administrative	23,485			71,637		3,431		2,844			2,241			—			103,638
Depreciation, depletion, amortization and accretion	27,815			6,501		6,197		9,704			7,486			—			57,703
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(8,537		)	200,761		20,480		(10,172		)	(2,156		)	10			200,386
Interest expense, net	845			182		156		660			353			—			2,196
Other expense	92			332		23		72			(5		)	—			514
Income (loss) before income taxes	$	(9,474	)	$	200,247	$	20,301	$	(10,904	)	$	(2,504	)	$	10		$	197,676

Six months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	90,377	$	1,709		$	38,912		$	23,223		$	19,007		$	—		$	173,228
Intersegment revenues	459		—			1,447			—			85			(1,991		)	—
Total revenue	90,836		1,709			40,359			23,223			19,092			(1,991		)	173,228
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	64,533		1,712			32,582			22,986			14,025			—			135,838
Intersegment cost of revenues	1,532		—			454			—			5			(1,991		)	—
Total cost of revenue	66,065		1,712			33,036			22,986			14,030			(1,991		)	135,838
Selling, general and administrative	4,180		355			4,474			2,728			2,700			—			14,437
Depreciation, depletion, amortization and accretion	18,784		340			3,569			9,942			4,495			—			37,130
Operating income (loss)	1,807		(698		)	(720		)	(12,433		)	(2,133		)	—			(14,177		)
Interest expense, net	431		4			486			657			(69		)	—			1,509
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	7		—			154			224			2			—			387
Income (loss) before income taxes	$	1,369	$	(702	)	$	2,652		$	(13,314	)	$	(2,066	)	$	—		$	(12,061	)

	Pressure Pumping		Infrastructure		Sand		Drilling		All Other		Eliminations			Total
As of June 30, 2018:
Total assets(a)	$	277,895	$	341,171	$	199,421	$	92,578	$	150,579	$	(32,521	)	$	1,029,123
Goodwill	$	86,043	$	891	$	2,684	$	—	$	11,893	$	—		$	101,511
As of December 31, 2017:
Total assets(a)	$	297,140	$	205,275	$	190,859	$	88,527	$	243,767	$	(158,325	)	$	867,243
Goodwill	$	86,043	$	891	$	2,684	$	—	$	10,193	$	—		$	99,811

a. Total assets included in the All Other column include Mammoth LLC corporate assets totaling $34.3 million and $148.8 million, respectively, as of June 30, 2018 and December 31, 2017, of which $16.9 million and $137.4 million are inter-segment accounts receivable which are eliminated in consolidation.

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Subsequent Events

6 Months Ended

Jun. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On July 9, 2018, the Company and certain of its direct and indirect subsidiaries entered into a third amendment to Mammoth's revolving credit facility with the lenders party thereto and PNC Bank, National Association, as a lender and agent for the lenders (the "Third Amendment"). Among other things, the Third Amendment permits (i) the declaration of quarterly cash distributions on the shares representing equity of Mammoth if, among other things, after giving effect to the payment of such dividend or distributions contemplated by the declaration, pro forma excess availability would be no less than 22.5% of the maximum available credit and no default or event of default exists, (ii) the payment of the declared dividends or distributions if (x) such dividends or distributions are made within sixty (60) days after the declaration thereof and (y) on the date such dividends or distributions are made, (1) after giving effect to the payment of such dividend or distribution, pro forma excess availability would be no less than 22.5% of the maximum available credit and (2) no material default or material event of default shall have occurred, or would result therefrom, and (iii) the issuance of third-party surety bonds in favor of Mammoth and its subsidiaries in relation with their bonded contracts, in each case subject to the additional limitations described in the Third Amendment.

On July 10, 2018, the Company's wholly owned subsidiary, Pressure Pumping and Gulfport entered into Amendment No. 2 to that certain Amended & Restated Master Services Agreement for Pressure Pumping Services, effective as of October 1, 2014, as amended effective January 1, 2016 (the “Existing Pressure Pumping Agreement”). Under the Existing Pressure Pumping Agreement, Pressure Pumping provides hydraulic fracturing, stimulation and related completion and rework services to Gulfport with two dedicated frac spreads and related equipment. The amendment extended the term of the existing pressure pumping agreement until December 31, 2021, unless it is terminated earlier in accordance with its terms, and expanded the service area to include both Ohio and Oklahoma. The amendment also provides that Gulfport has the right to suspend pressure pumping services for up to one crew by upon a minimum of 90 days prior written notice to Pressure Pumping, with no further payment or other obligation to Pressure Pumping for such suspended crew. Pressure Pumping will be obligated to resume any such suspended pressure pumping services upon 90 days prior written notice by Gulfport, unless such notice is waived by Pressure Pumping. The amendment also provides for the initial suspension of pressure pumping services to Gulfport for a period July 1, 2018 through September 30, 2018, during which period Pressure Pumping may use the dedicated frac spreads for other customers. If during the initial suspension period Pressure Pumping’s use of the dedicated frac spreads for other customers does not reach a certain level, then Gulfport will pay agreed costs to Pressure Pumping and Pressure Pumping will perform services for Gulfport with respect to such amount. In addition, if during such initial suspension period Pressure Pumping is unable to utilize the dedicated frac spreads for other customers, Gulfport will pay agreed recoupment costs to Pressure Pumping during the period of October 1, 2018 to December 31, 2018.

On August 6, 2018, the Company's wholly owned subsidiary, Muskie Proppant LLC ("Muskie Proppant") and Gulfport entered into a Second Amendment to the Sand Supply Agreement, effective as of October 1, 2014, as amended effective November 15, 2015. The amendment extends the term of the agreement until December 31, 2021.

The Company's unsatisfied performance obligations increased approximately $88.8 million as a result of the amendments to the pressure pumping and sand supply agreements with Gulfport.

On July 16, 2018, the Company's Board of Directors initiated a quarterly dividend policy and declared the Company's first quarterly cash dividend of $0.125 per share of common stock, to be paid on August 14, 2018 to stockholders of record as of the close of business on August 7, 2018. Based on the number of shares outstanding at June 30, 2018, the total dividend payable to stockholders on August 14, 2018 will be approximately $5.6 million.

Subsequent to June 30, 2018, the Company entered into rail car and property lease agreements with aggregate commitments of $2.4 million.

Subsequent to June 30, 2018, the Company ordered additional capital equipment with aggregate commitments of $9.6 million.

Subsequent to June 30, 2018, subsidiaries in the Company's infrastructure segment entered into an air chart agreement, barge chartering agreement and other service agreements with aggregate commitments of $2.5 million, $2.1 million and $0.6 million, respectively.

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Basis of Presentation and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated interim financial statements include the accounts of the Company and its subsidiaries and the variable interest entity ("VIE") for which the Company is the primary beneficiary. All material intercompany accounts and transactions have been eliminated.

This report has been prepared in accordance with the rules and regulations of the Securities and Exchange Commission, and reflects all adjustments, which in the opinion of management are necessary for the fair presentation of the results for the interim periods, on a basis consistent with the annual audited consolidated financial statements. Certain information, accounting policies and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles (“GAAP”) have been omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the summary of significant accounting policies and notes thereto included in the Company’s most recent annual report on Form 10-K.

On June 5, 2017, the Company acquired Sturgeon Acquisitions LLC ("Sturgeon") and Sturgeon's wholly owned subsidiaries Taylor Frac, LLC, Taylor Real Estate Investments, LLC and South River Road, LLC. Prior to its acquisition of Sturgeon, the Company and Sturgeon were under common control and it is required under GAAP to account for this common control acquisition in a manner similar to the pooling of interest method of accounting. Therefore, the Company's historical financial information for all periods included in the accompanying financial statements has been recast to combine Sturgeon with the Company as if the acquisition had been effective since the date Sturgeon commenced operations.

Accounts Receivable

Accounts Receivable

Accounts receivable include amounts due from customers for services performed and are recorded as the work progresses. The Company grants credit to customers in the ordinary course of business and generally does not require collateral. Most areas in which the Company operates provide for a mechanic’s lien against the property on which the service is performed if the lien is filed within the statutorily specified time frame. Customer balances are generally considered delinquent if unpaid by the 30th day following the invoice date and credit privileges may be revoked if balances remain unpaid.

The Company regularly reviews receivables and provides for estimated losses through an allowance for doubtful accounts. In evaluating the level of established reserves, the Company makes judgments regarding its customers’ ability to make required payments, economic events and other factors. As the financial condition of customers changes, circumstances develop, or additional information becomes available, adjustments to the allowance for doubtful accounts may be required. In the event the Company was to determine that a customer may not be able to make required payments, the Company would increase the allowance through a charge to income in the period in which that determination is made. Uncollectible accounts receivable are periodically charged against the allowance for doubtful accounts once a final determination is made regarding their uncollectability.

Concentrations of Credit Risk and Significant Customers

Concentrations of Credit Risk and Significant Customers

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents in excess of federally insured limits and trade receivables.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The Company's financial instruments consist of cash and cash equivalents, trade receivables, trade payables, amounts receivable or payable to related parties, and long-term debt. The carrying amount of cash and cash equivalents, trade receivables, receivables from related parties and trade payables approximates fair value because of the short-term nature of the instruments. The fair value of long-term debt approximates its carrying value because the cost of borrowing fluctuates based upon market conditions.

New Accounting Pronouncements

New Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-2 “Leases” amending the current accounting for leases. Under the new provisions, all lessees will report a right-of-use asset and a liability for the obligation to make payments for all leases with the exception of those leases with a term of 12 months or less.  All other leases will fall into one of two categories: (i) a financing lease or (ii) an operating lease. Lessor accounting remains substantially unchanged with the exception that no leases entered into after the effective date will be classified as leveraged leases. For sale leaseback transactions, a sale will only be recognized if the criteria in the new revenue recognition standard are met. ASU 2016-2 is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. The Company plans to adopt this ASU effective January 1, 2019 utilizing the modified retrospective method of adoption. This new leasing guidance will impact the Company in situations where it is the lessee, and in certain circumstances it will have a right-of-use asset and lease liability on its consolidated financial statements. The Company is currently evaluating the effect the new guidance may have on the Company's consolidated financial statements and results of operations.

In June 2018, the FASB issued ASU No. 2018-07, “Compensation - Stock Compensation (Topic 718): Improvements to Non-employee Share-Based Accounting,” which simplifies the accounting for share-based payments granted to non-employees by aligning the accounting with requirements for employee share-based compensation. Upon transition, this ASU requires non-employee awards to be measured at fair value as of the adoption date. This ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within that fiscal year. Early adoption is permitted. Currently, the Company has not elected to early adopt this ASU and is evaluating the impact it will have on the Company's consolidated financial statements.

Revenues

Adoption of ASC 606 "Revenues from Contracts with Customers"

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which supersedes the revenue recognition requirements in ASC 605, Revenue Recognition, and most industry-specific guidance. The new guidance requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

On January 1, 2018, the Company adopted ASU 2014-09 and its related amendments (collectively, "ASC 606") using the modified retrospective method applied to contracts which were not completed as of January 1, 2018. Revenues for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts continue to be reported under previous revenue recognition guidance. While ASC 606 requires additional disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, its adoption has not had a material impact on the measurement or recognition of the Company's revenues.

The adoption of ASC 606 represents a change in accounting principle. After evaluation of all contracts not completed as of January 1, 2018, the Company determined the cumulative effect of adopting ASC 606 was immaterial, and as such, has not recorded an adjustment to the opening balance of retained earnings on January 1, 2018.

Pressure Pumping Services

Pressure pumping services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Generally, the Company accounts for pressure pumping services as a single performance obligation satisfied over time. In certain circumstances, the Company supplies proppant that is utilized for pressure pumping as part of the agreement with the customer. The Company accounts for these pressure pumping agreements as multiple performance obligations satisfied over time. Jobs for these services are typically short-term in nature and range from a few hours to multiple days. Generally, revenue is recognized over time upon the completion of each segment of work based upon a completed field ticket, which includes the charges for the services performed, mobilization of the equipment to the location and personnel.

Pursuant to a contract with one of its customers, the Company has agreed to provide that customer with use of two pressure pumping fleets for the period covered by the contract. Under this agreement, performance obligations are satisfied as services are rendered based on the passage of time rather than the completion of each segment of work. The Company has the right to receive consideration from this customer even if circumstances prevent us from performing work. All consideration owed to the Company for services performed during the contractual period is fixed and the right to receive it is unconditional.

Additional revenue is generated through labor charges and the sale of consumable supplies that are incidental to the service being performed. Such amounts are recognized ratably over the period during which the corresponding goods and services are consumed.

Infrastructure Services

Infrastructure services are typically provided pursuant to master service agreements, repair and maintenance contracts or fixed price and non-fixed price installation contracts. Pricing under these contracts may be unit priced, cost-plus/hourly (or time and materials basis) or fixed price (or lump sum basis). The Company accounts for infrastructure services as a single performance obligation satisfied over time. Revenue is recognized over time as work progresses based on the days completed or as the contract is completed.

Natural Sand Proppant Services

The Company sells natural sand proppant through sand supply agreements with its customers. Under these agreements, sand is typically sold at a flat rate per ton or a flat rate per ton with an index-based adjustment. The Company recognizes revenue at the point in time when the customer obtains legal title to the product, which may occur at the production facility, rail origin or at the destination terminal.

Certain of the Company's sand supply agreements contain a minimum volume commitment related to sand purchases whereby the Company charges a shortfall payment if the customer fails to meet the required minimum volume commitment. These agreements may also contain make-up provisions whereby shortfall payments can be applied in future periods against purchased volumes exceeding the minimum volume commitment. If a make-up right exists, the Company has future performance obligations to deliver excess volumes of product in subsequent months. In accordance with ASC 606, if the customer fails to meet the minimum volume commitment, the Company will assess whether it expects the customer to fulfill its unmet commitment during the contractually specified make-up period based on discussions with the customer and management's knowledge of the business. If the Company expects the customer will make-up deficient volumes in future periods, revenue related to shortfall payments will be deferred and recognized on the earlier of the date on which the customer utilizes make-up volumes or the likelihood that the customer will exercise its right to make-up deficient volumes becomes remote. If the Company does not expect the customer will make-up deficient volumes in future periods, the breakage model will be applied and revenue related to shortfall payments will be recognized when the model indicates the customer's inability to take delivery of excess volumes. During the three and six months ended June 30, 2018, the Company recognized $0.3 million in revenue related to shortfall payments.

In certain of the Company's sand supply agreements, the customer obtains control of the product when it is loaded into rail cars and the customer reimburses the Company for all freight charges incurred. The Company has elected to account for shipping and handling as activities to fulfill the promise to transfer the sand. If revenue is recognized for the related product before the shipping and handling activities occur, the Company accrues the related costs of those shipping and handling activities.

Contract Land and Directional Drilling Services

Contract drilling services are provided under daywork contracts. Directional drilling services, including motor rentals, are provided on a day rate or hourly basis, and revenue is recognized as work progresses. Performance obligations are satisfied over time as the work progresses based on the measure of output. Mobilization revenue and costs are recognized over the days of actual drilling.

Other Services

The Company also provides coil tubing, pressure control, flowback, cementing, acidizing, equipment rentals, crude oil hauling and remote accommodations services, which are reported under other services. These services are typically provided based upon a purchase order, contract or on a spot market basis. Services are provided on a day rate, contracted or hourly basis. Performance obligations for these services are satisfied over time and revenue is recognized as the work progresses based on the measure of output. Jobs for these services are typically short-term in nature and range from a few hours to multiple days.

Practical Expedients

The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts in which variable consideration is allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied distinct good or service that forms part of a single performance obligation.

Inventories

Inventories

Inventory consists of raw sand and processed sand available for sale, chemicals and other products sold as a bi-product of completion and production operations and supplies used in performing services. Inventory is stated at the lower of cost or market (net realizable value) on an average cost basis.

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Organization and Nature of Business (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of ownership of the company by major stakeholders

At June 30, 2018 and December 31, 2017, Wexford, Gulfport and Rhino beneficially owned the following shares of outstanding common stock of Mammoth Inc.:

	At June 30, 2018			At December 31, 2017
	Share Count	% Ownership		Share Count	% Ownership
Wexford	22,252,277	49.7	%	25,009,319	56.1	%
Gulfport	9,943,645	22.2	%	11,171,887	25.1	%
Rhino	104,100	0.2	%	568,794	1.3	%
Outstanding shares owned by related parties	32,300,022	72.1	%	36,750,000	82.5	%
Total outstanding	44,752,765	100.0	%	44,589,306	100.0	%

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Basis of Presentation and Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Schedule of allowance for doubtful accounts receivable

Following is a roll forward of the allowance for doubtful accounts for the year ended December 31, 2017 and the six months ended June 30, 2018 (in thousands):

Balance, January 1, 2017	$	5,377
Additions charged to expense	16,206
Additions other	179
Deductions for uncollectible receivables written off	(25		)
Balance, December 31, 2017	21,737
Additions charged to expense	53,790
Deductions for uncollectible receivables written off	(1,758		)
Balance, June 30, 2018	$	73,769

Schedules of concentration of risk

Following is a summary of our significant customers based on percentages of total accounts receivable balances at June 30, 2018 and December 31, 2017 and percentages of total revenues derived for the three and six months ended June 30, 2018 and 2017:

	REVENUES								ACCOUNTS RECEIVABLE
	Three Months Ended June 30,				Six Months Ended June 30,				At June 30,		At December 31,
	2018		2017		2018		2017		2018		2017
Customer A(a)	65	%	—	%	65	%	—	%	59	%	56	%
Customer B(b)	9	%	59	%	11	%	59	%	9	%	12	%

a. Customer A is a third-party customer. Revenues and the related accounts receivable balances earned from Customer A were derived from the Company's infrastructure services segment.

b. Customer B is a related party customer. Revenues and the related accounts receivable balances earned from Customer B were derived from the Company's pressure pumping services segment, natural sand proppant services segment, contract land and directional drilling services segment and other businesses.

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Revenues (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of revenues by service or product line

The following table presents revenues disaggregated by service line (in thousands):

	Three Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Revenue:
Pressure pumping services	$	101,406		$	50,196		$	202,544		$	90,836
Infrastructure services	360,250			1,709			685,709			1,709
Natural sand proppant services	52,845			24,762			103,860			40,359
Contract land and directional drilling services	17,210			12,472			32,440			23,223
Other services	20,167			10,242			43,062			19,092
Eliminations	(18,284		)	(1,119		)	(39,772		)	(1,991		)
Total revenue	$	533,594		$	98,262		$	1,027,843		$	173,228

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Acquisitions (Tables)

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Schedule of recognized identified assets acquired and liabilities assumed

The following table summarizes the fair value of WTL as of May 31, 2018 (in thousands):

	WTL
Property, plant and equipment	$	2,960
Identifiable intangible assets - customer relationships(a)	930
Identifiable intangible assets - trade name(a)	650
Goodwill(b)	1,567
Total assets acquired	$	6,107

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 10-20 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

The following table summarizes the fair value of Higher Power as of April 21, 2017 (in thousands):

	Higher Power
Property, plant and equipment	$	1,744
Identifiable intangible assets - customer relationships	1,613
Goodwill (a)	643
Total assets acquired	$	4,000

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

The following table summarizes the fair value of the Chieftain Acquisition as of May 26, 2017 (in thousands):

	Total
Property, plant and equipment (a)	$	23,373
Sand reserves (b)	20,910
Total assets acquired	$	44,283
Asset retirement obligation	1,732
Total liabilities assumed	$	1,732
Total allocation of purchase price	$	42,551
Bargain purchase price (c,d)	(6,231		)
Total purchase price	$	36,320

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. The fair value of the sand reserves was determined based on the excess cash flow method, a form of the income approach. The method provides a value based on the estimated remaining life of sand reserves, projected financial information and industry projections.

c. Amount reflected in unaudited condensed consolidated statements of comprehensive income (loss) reflected net of income taxes of $2.2 million.

d. The fair value of the business was determined based on the excess cash flow method, a form of the income approach.

See Summary of acquired assets and liabilities below

	SR Energy		Cementing		Total
	(in thousands)
Cash and cash equivalents	$	1,611	$	1,060	$	2,671
Accounts receivable, net	3,913		495		4,408
Receivables from related parties	3,684		1,418		5,102
Inventories	—		306		306
Prepaid expenses	35		32		67
Property, plant and equipment(a)	13,061		7,459		20,520
Identifiable intangible assets - customer relationships(b)	—		1,140		1,140
Identifiable intangible assets - trade names(b)	550		270		820
Goodwill(c)	3,929		6,264		10,193
Other assets	7		—		7
Total assets acquired	$	26,790	$	18,444	$	45,234
Accounts payable and accrued liabilities	$	5,890	$	2,063	$	7,953
Long-term debt (d)	5,074		2,000		7,074
Deferred tax liability	3,039		1,406		4,445
Total liabilities assumed	$	14,003	$	5,469	$	19,472
Net assets acquired	$	12,787	$	12,975	$	25,762

a. Property, plant and equipment fair value measurements were prepared by utilizing a combined fair market value and cost approach. The market approach relies on comparability of assets using market data information. The cost approach places emphasis on the physical components and characteristics of the asset. It places reliance on estimated replacement cost, depreciation and economic obsolescence.

b. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Non-contractual customer relationships were valued using a "Multi-period excess earnings" method. Identifiable intangible assets will be amortized over 5-10 years.

c. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforces and future profitability expected to arise from the acquired entities.

d. Long-term debt assumed was paid off subsequent to the acquisitions.

The following table summarizes the fair value of 5 Star as of July 1, 2017 (in thousands):

	5 Star
Accounts receivable	$	2,440
Property, plant and equipment	1,863
Identifiable intangible assets - trade names (a)	300
Goodwill (b)	248
Total assets acquired	$	4,851
Long-term debt and other liabilities	$	2,413
Total liabilities assumed	$	2,413
Net assets acquired	$	2,438

a. Identifiable intangible assets were measured using a combination of income approaches. Trade names were valued using a "Relief-from-Royalty" method. Identifiable intangible assets will be amortized over 10 years.

b. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

The following table summarizes the fair value of RTS as of June 15, 2018 (in thousands):

	RTS
Inventory	$	180
Property, plant and equipment	7,787
Goodwill(a)	133
Total assets acquired	$	8,100

a. Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill recorded in connection with the acquisition is attributable to the assembled workforce and future profitability expected to arise from the acquired entity.

Business acquisition, pro forma information

From the acquisition date through June 30, 2018, RTS provided the following activity (in thousands):

	2018
Revenues	$	630
Net income(a)	7

a.    Includes depreciation expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of RTS had occurred as of January 1, 2017 (in thousands):

	Six Months Ended
	June 30, 2018			June 30, 2017
Revenues	$	10,160		$	8,326
Net income (loss)	(848		)	653

From the acquisition date through June 30, 2018, WTL provided the following activity (in thousands):

	2018
Revenues	$	595
Net income(a)	5

a.    Includes depreciation and amortization expense of $0.1 million.

The following table presents unaudited pro forma information as if the acquisition of WTL had occurred as of January 1, 2017 (in thousands):

	Six Months Ended
	June 30, 2018		June 30, 2017
Revenues	$	3,354	$	1,553
Net income	90		62

From the acquisition date through June 30, 2018, the Chieftain Assets provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	35,128	$	22,847
Net income(b)	10,694		5,520

a.Includes intercompany revenues of $9.6 million and $12.3 million, respectively, for 2018 and 2017

b.Includes depreciation, depletion, amortization and accretion of $2.3 million and $2.8 million, respectively, for 2018 and 2017

The following table presents unaudited pro forma information as if the acquisition of the Chieftain Assets had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	1,312
Net loss	(72		)

From the acquisition date through June 30, 2018, Higher Power provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	122,734	$	39,571
Net income (b)	16,205		5,127

a.Includes intercompany revenues of $111.4 million and $27.4 million, respectively for 2018 and 2017.

b.Includes depreciation and amortization expense of $2.3 million and $2.0 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of Higher Power had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	4,481
Net loss	(411		)

From the acquisition date through June 30, 2018, 5 Star provided the following activity (in thousands):

	2018		2017
Revenues(a)	$	86,720	$	25,216
Net income (b)	12,903		4,191

a.Includes intercompany revenues of $77.5 million and $16.0 million, respectively, for 2018 and 2017.

b.Includes depreciation and amortization expense of $1.0 million and $0.8 million, respectively, for 2018 and 2017.

The following table presents unaudited pro forma information as if the acquisition of 5 Star had occurred as of January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	6,332
Net loss	(282		)

From the acquisition date through June 30, 2018, SR Energy and Cementing provided the following activity (in thousands):

	2018						2017
	SR Energy			Cementing			SR Energy			Cementing
Revenues(a)	$	16,034		$	5,131		$	11,572		$	7,500
Net loss(b)	(1,586		)	(806		)	(1,626		)	(1,963		)

a. Includes intercompany revenues of $1.6 million and $0.6 million for SR Energy in 2018 and 2017.

b. Includes depreciation and amortization expense of $2.8 million and $1.0 million, respectively, for SR Energy and Cementing in 2018 and $3.4 million and $4.1 million, respectively, for SR Energy and Cementing in 2017.

The following table presents unaudited pro forma information as if the acquisition of SR Energy and Cementing had occurred on January 1, 2017 (in thousands):

	Six Months Ended June 30, 2017
Revenues	$	18,333
Net loss	(1,612		)

Schedule of business acquisitions by acquisition, consideration transferred

The following tables summarize the fair values of Cementing and SR Energy as of June 5, 2017 (in thousands):

Consideration attributable to Cementing (a)	$	12,975
Consideration attributable to SR Energy (a)	12,787
Total consideration transferred	$	25,762

a.    See Summary of acquired assets and liabilities below

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Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventory

A summary of the Company's inventories is shown below (in thousands):

	June 30,		December 31,
	2018		2017
Supplies	$	7,264	$	9,437
Raw materials	321		219
Work in process	1,326		2,370
Finished goods	3,806		5,788
Total inventory	$	12,717	$	17,814

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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Property, plant and equipment include the following (in thousands):

		June 30,		December 31,
	Useful Life	2018		2017
Pressure pumping equipment	3-5 years	$	199,333	$	190,211
Drilling rigs and related equipment	3-15 years	137,075		132,260
Machinery and equipment(a)	7-20 years	140,308		97,569
Buildings	15-39 years	47,593		45,992
Vehicles, trucks and trailers(b)	5-10 years	91,680		54,055
Coil tubing equipment	4-10 years	28,068		28,053
Land	N/A	14,183		11,317
Land improvements	15 years or life of lease	9,614		9,614
Rail improvements	10-20 years	13,101		5,540
Other property and equipment	3-12 years	15,006		12,687
		695,961		587,298
Deposits on equipment and equipment in process of assembly		33,349		20,348
		729,310		607,646
Less: accumulated depreciation(c)		305,995		256,629
Property, plant and equipment, net		$	423,315	$	351,017

a. Included in machinery and equipment are assets under capital leases totaling $1.8 million and $1.8 million, respectively, at June 30, 2018 and December 31, 2017.

b. Included in vehicles, trucks and trailers are assets under capital leases totaling $3.8 million and $1.0 million, respectively, at June 30, 2018 and December 31, 2017.

c. Accumulated depreciation for assets under capital leases totaled $0.9 million and $0.8 million, respectively, at June 30, 2018 and December 31, 2017.

Schedule of depreciation, depletion, accretion and amortization expense

A summary of depreciation, depletion, amortization and accretion expense is below (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Depreciation expense(a)	$	27,058	$	17,229	$	51,456	$	32,196
Depletion expense	1,340		382		1,427		384
Amortization expense	2,382		2,268		4,790		4,536
Accretion expense	15		14		30		14
Depreciation, depletion, amortization and accretion	$	30,795	$	19,893	$	57,703	$	37,130

a. Includes depreciation expense for assets under capital leases totaling $0.4 million and $0.2 million, respectively, for the six months ended June 30, 2018 and 2017.

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Intangible Assets and Goodwill (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

The Company had the following definite lived intangible assets recorded (in thousands):

	June 30,			December 31,
	2018			2017
Customer relationships	$	36,725		$	35,795
Trade names	9,443			8,793
Less: accumulated amortization - customer relationships	(30,521		)	(26,172		)
Less: accumulated amortization - trade names	(2,717		)	(2,277		)
Intangible assets, net	$	12,930		$	16,139

Schedule of finite-lived intangible assets, future amortization expense

Aggregated expected amortization expense for the future periods is expected to be as follows (in thousands):

	Amount
Remainder of 2018	$	3,969
2019	1,293
2020	1,293
2021	1,288
2022	1,266
Thereafter	3,821
	$	12,930

Schedule of goodwill

Changes in the goodwill for the year ended December 31, 2017 and the six months ended June 30, 2018 are set forth below (in thousands):

Balance, January 1, 2017	$	88,727
Additions - 2017 Stingray Acquisition (Note 4)	10,193
Additions - Higher Power Acquisition (Note 4)	643
Additions - 5 Star Acquisition (Note 4)	248
Balance, December 31, 2017	99,811
Additions - WTL Acquisition (Note 4)	1,567
Additions - RTS Acquisition (Note 4)	133
Balance, June 30, 2018	$	101,511

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Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Payables and Accruals [Abstract]

Schedule of accounts payable and accrued liabilities

Accrued expense and other current liabilities included the following (in thousands):

	June 30,		December 31,
	2018		2017
Deferred revenue	15,100		15,210
Accrued compensation, benefits and related taxes	19,917		11,552
Financed insurance premiums	1,638		4,876
Insurance reserves	4,183		2,942
State and local taxes payable	8,205		2,126
Other	5,658		4,189
Total	$	54,701	$	40,895

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Other Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Other Liabilities Disclosure [Abstract]

Schedule of other liabilities

Other liabilities included the following (in thousands):

	June 30,			December 31,
	2018			2017
Capital lease obligations	$	4,253		$	2,015
Equipment financing arrangement	1,436			1,605
Other	250			500
Total	5,939			4,120
Less: Current portion of capital lease and equipment financing obligations included in accrued expenses and other current liabilities	(1,839		)	(831		)
Total Other Liabilities	$	4,100		$	3,289

Schedule of future minimum lease payments for capital leases

Aggregate future payments under the Company's non-cancelable capital leases and equipment financing arrangement as of June 30, 2018 are as follows (in thousands):

2018	$	890
2019	2,593
2020	1,696
2021	664
2022	360
Total future minimum payments	6,203
Less interest payments	(514		)
Present value of future minimum payments	$	5,689

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Selling, General And Administrative Expense (Tables)

6 Months Ended

Jun. 30, 2018

Other Income and Expenses [Abstract]

Schedule of selling, general and administrative expense

Selling, general and administrative ("SG&A") expense includes of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cash expenses:
Compensation and benefits	$	10,978	$	2,966	$	18,677	$	5,381
Professional services	2,981		1,652		5,568		3,581
Other(a)	3,935		2,015		5,542		3,880
Total cash SG&A expense	17,894		6,633		29,787		12,842
Non-cash expenses:
Bad debt provision	28,263		17		53,790		(25		)
Equity based compensation(b)	17,487		—		17,487		—
Stock based compensation	1,483		1,050		2,574		1,620
Total non-cash SG&A expense	47,233		1,067		73,851		1,595
Total SG&A expense	$	65,127	$	7,700	$	103,638	$	14,437

a. Includes travel-related costs, IT expenses, rent, utilities and other general and administrative-related costs.

b. Represents compensation expense for non-employee awards, which were issued and are payable by certain affiliates of Wexford (the sponsor level). See Note 15 for additional detail.

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of components of income tax expense (benefit)

The components of income tax expense (benefit) attributable to the Company for the three and six months ended June 30, 2018 and 2017, are as follows (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Foreign current income tax expense	$	67,665		$	21		$	125,712		$	606
Foreign deferred income tax benefit	(15,266		)	(14		)	(25,386		)	(20		)
U.S. current income tax expense	1,636			—			1,624			—
U.S. deferred income tax benefit	(523		)	(2,811		)	(2,520		)	(6,496		)
Total	$	53,512		$	(2,804	)	$	99,430		$	(5,910	)

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Earnings (Loss) Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of earnings per unit

Reconciliations of the components of basic and diluted net income (loss) per common share are presented in the table below (in thousands, except per share data):

	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018		2017
Basic earnings (loss) per share:
Allocation of earnings:
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares outstanding	44,737		39,500			44,700		38,506
Basic earnings (loss) per share	$	0.95	$	(0.03	)	$	2.20	$	(0.16	)
Diluted earnings (loss) per share:
Allocation of earnings (loss):
Net income (loss)	$	42,700	$	(1,170	)	$	98,246	$	(6,151	)
Weighted average common shares, including dilutive effect (a)	45,059		39,500			44,977		38,506
Diluted earnings (loss) per share	$	0.95	$	(0.03	)	$	2.18	$	(0.16	)

^a.  No incremental shares of potentially dilutive restricted stock awards were included for the three and six months ended June 30, 2017 as their effect was antidulitive under the treasury stock method.

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Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of share-based compensation, restricted stock and restricted stock units activity

A summary of the status and changes of the unvested shares of restricted stock under the 2016 Plan is presented below.

	Number of Unvested Restricted Shares		Weighted Average Grant-Date Fair Value
Unvested shares as of January 1, 2018	640,632		$	19.44
Granted	93,556		26.83
Vested	(149,098	)	21.29
Forfeited	—		—
Unvested shares as of June 30, 2018	585,090		$	21.07

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Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2018

Related Party Transactions [Abstract]

Schedule of related party transactions

Following is a summary of related party transactions (in thousands):

		REVENUES								ACCOUNTS RECEIVABLE
		Three Months Ended June 30,				Six Months Ended June 30,				At June 30,			At December 31,
		2018		2017		2018		2017		2018			2017
Pressure Pumping and Gulfport	(a)	$	33,831	$	41,100	$	72,377	$	72,845	$	20,127		$	25,054
Muskie and Gulfport	(b)	9,730		13,605		21,192		25,145		4,428			1,947
Panther Drilling and Gulfport	(c)	—		952		56		1,994		12			872
Cementing and Gulfport	(d)	2,048		903		4,876		903		1,739			2,255
SR Energy and Gulfport	(e)	4,626		1,565		11,579		1,565		4,292			3,348
Panther Drilling and El Toro	(f)	—		—		345		—		—			—
Redback Energy and El Toro	(g)	92		34		92		158		—			—
Coil Tubing and El Toro	(h)	—		—		360		—		(2		)	—
Bison Drilling and Predator	(i)	—		—		—		—		—			234
Other Relationships		14		49		14		100		78			78
		$	50,341	$	58,208	$	110,891	$	102,710	$	30,674		$	33,788

a. Pressure Pumping provides pressure pumping, stimulation and related completion services to Gulfport.

b. Muskie has agreed to sell and deliver, and Gulfport has agreed to purchase, specified annual and monthly amounts of natural sand proppant, subject to certain exceptions specified in the agreement, and pay certain costs and expenses.

c. Panther Drilling performs drilling services for Gulfport pursuant to a master service agreement.

d. Cementing performs well cementing services for Gulfport.

e. SR Energy performs rental services for Gulfport.

f. Panther provides services for El Toro, an entity controlled by Wexford, pursuant to a master service agreement.

g. Redback Energy performs completion and production services for El Toro pursuant to a master service agreement.

h. Coil Tubing provides to El Toro services in connection with completion and drilling activities.

i. Bison Drilling provides equipment rentals to Predator, an entity in which Wexford owns a minority interest.

		Three Months Ended June 30,					Six Months Ended June 30,				At June 30,		At December 31,
		2018			2017		2018		2017		2018		2017
		COST OF REVENUE					COST OF REVENUE				ACCOUNTS PAYABLE
Cobra and T&E	(a)	$	1,486		$	—	$	2,762	$	—	$	289	$	457
Higher Power and T&E	(a)	950			—		1,458		—		576		3
Panther and DBDHT	(b)	—			—		—		128		—		77
The Company and 2017 Stingray Companies	(c)	—			207		—		444		—		—
Other		(8		)	55		—		120		—		218
		$	2,428		$	262	$	4,220	$	692	$	865	$	755
		SELLING, GENERAL AND ADMINISTRATIVE COSTS					SELLING, GENERAL AND ADMINISTRATIVE COSTS
The Company and Everest	(d)	$	55		$	50	$	86	$	108	$	6	$	19
The Company and Wexford	(e)	290			165		473		398		78		150
The Company and Caliber	(f)	145			72		346		72		47		1
Other		42			20		56		53		—		2
		$	532		$	307	$	961	$	631	$	131	$	172
		CAPITAL EXPENDITURES					CAPITAL EXPENDITURES
Cobra and T&E	(a)	$	757		$	—	$	1,131	$	—	$	170	$	66
Higher Power and T&E	(a)	1,575			—		2,773		—		750		385
		$	2,332		$	—	$	3,904	$	—	$	920	$	451
											$	1,916	$	1,378

a. Cobra and Higher Power purchase materials and services from T&E, an entity in which a member of management's family owns a minority interest.

b. Panther rents rotary steerable equipment in connection with its directional drilling services from DBDHT.

c. Prior to the 2017 Stingray Acquisition, the 2017 Stingray Companies provided certain services to the Company and, from time to time, the 2017 Stingray Companies paid for goods and services on behalf of the Company.

d. Everest has historically provided office space and certain technical, administrative and payroll services to the Company and the Company has reimbursed Everest in amounts determined by Everest based on estimates of the amount of office space provided and the amount of employees’ time spent performing services for the Company.

e. Wexford provides certain administrative and analytical services to the Company and, from time to time, the Company pays for goods and services on behalf of Wexford.

f. Caliber leases office space to Mammoth.

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments for operating leases

Aggregate future minimum payments under these obligations in effect at June 30, 2018 are as follows (in thousands):

Year ended December 31:	Operating Leases		Capital Spend Commitments		Minimum Purchase Commitments
Remainder of 2018	$	12,148	$	16,393	$	19,254
2019	18,091		—		12,125
2020	15,622		—		400
2021	12,029		—		165
2022	8,995		—		—
Thereafter	6,057		—		—
	$	72,942	$	16,393	$	31,944

Schedule of letters of credit

The letters of credit are categorized below (in thousands):

	June 30,		December 31,
	2018		2017
Environmental remediation	$	3,582	$	3,582
Insurance programs	2,486		2,486
Rail car commitments	455		455
Total letters of credit	$	6,523	$	6,523

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Reporting Segments (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment

The following tables set forth certain financial information with respect to the Company’s reportable segments (in thousands):

Three months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	100,333		$	360,250	$	37,439	$	17,126		$	18,446		$	—		$	533,594
Intersegment revenues	1,073			—		15,406		84			1,721			(18,284		)	—
Total revenue	101,406			360,250		52,845		17,210			20,167			(18,284		)	533,594
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	61,593			210,189		35,117		15,280			17,649			—			339,828
Intersegment cost of revenues	16,174			754		1,019		(40		)	129			(18,036		)	—
Total cost of revenue	77,767			210,943		36,136		15,240			17,778			(18,036		)	339,828
Selling, general and administrative	20,822			39,786		1,787		1,591			1,141			—			65,127
Depreciation, depletion, amortization and accretion	13,829			4,094		3,881		5,349			3,642			—			30,795
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(11,012		)	105,427		11,041		(5,157		)	(2,394		)	(248		)	97,657
Interest expense, net	341			106		76		265			171			—			959
Other expense	80			330		36		32			8			—			486
Income (loss) before income taxes	$	(11,433	)	$	104,991	$	10,929	$	(5,454	)	$	(2,573	)	$	(248	)	$	96,212

Three months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	49,924	$	1,709		$	24,000		$	12,472		$	10,157		$	—		$	98,262
Intersegment revenues	272		—			762			—			85			(1,119		)	—
Total revenue	50,196		1,709			24,762			12,472			10,242			(1,119		)	98,262
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	35,826		1,626			19,974			12,033			7,881			—			77,340
Intersegment cost of revenues	847		—			267			—			5			(1,119		)	—
Total cost of revenue	36,673		1,626			20,241			12,033			7,886			(1,119		)	77,340
Selling, general and administrative	2,403		307			2,416			1,435			1,139			—			7,700
Depreciation, depletion, amortization and accretion	9,626		340			2,206			4,974			2,747			—			19,893
Operating income (loss)	1,494		(564		)	(101		)	(5,970		)	(1,530		)	—			(6,671		)
Interest expense, net	303		4			353			440			12			—			1,112
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	4		—			140			60			(1		)	—			203
Income (loss) before income taxes	$	1,187	$	(568	)	$	3,418		$	(6,470	)	$	(1,541	)	$	—		$	(3,974	)

Six months ended June 30, 2018	Pressure Pumping			Infrastructure		Sand		Drilling			All Other			Eliminations			Total
Revenue from external customers	$	196,912		$	685,709	$	73,942	$	32,354		$	38,926		$	—		$	1,027,843
Intersegment revenues	5,632			—		29,918		86			4,136			(39,772		)	—
Total revenue	202,544			685,709		103,860		32,440			43,062			(39,772		)	1,027,843
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	128,205			404,265		68,447		29,755			35,257			—			665,929
Intersegment cost of revenues	31,576			2,545		5,305		122			234			(39,782		)	—
Total cost of revenue	159,781			406,810		73,752		29,877			35,491			(39,782		)	665,929
Selling, general and administrative	23,485			71,637		3,431		2,844			2,241			—			103,638
Depreciation, depletion, amortization and accretion	27,815			6,501		6,197		9,704			7,486			—			57,703
Impairment of long-lived assets	—			—		—		187			—			—			187
Operating income (loss)	(8,537		)	200,761		20,480		(10,172		)	(2,156		)	10			200,386
Interest expense, net	845			182		156		660			353			—			2,196
Other expense	92			332		23		72			(5		)	—			514
Income (loss) before income taxes	$	(9,474	)	$	200,247	$	20,301	$	(10,904	)	$	(2,504	)	$	10		$	197,676

Six months ended June 30, 2017	Pressure Pumping		Infrastructure			Sand			Drilling			All Other			Eliminations			Total
Revenue from external customers	$	90,377	$	1,709		$	38,912		$	23,223		$	19,007		$	—		$	173,228
Intersegment revenues	459		—			1,447			—			85			(1,991		)	—
Total revenue	90,836		1,709			40,359			23,223			19,092			(1,991		)	173,228
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	64,533		1,712			32,582			22,986			14,025			—			135,838
Intersegment cost of revenues	1,532		—			454			—			5			(1,991		)	—
Total cost of revenue	66,065		1,712			33,036			22,986			14,030			(1,991		)	135,838
Selling, general and administrative	4,180		355			4,474			2,728			2,700			—			14,437
Depreciation, depletion, amortization and accretion	18,784		340			3,569			9,942			4,495			—			37,130
Operating income (loss)	1,807		(698		)	(720		)	(12,433		)	(2,133		)	—			(14,177		)
Interest expense, net	431		4			486			657			(69		)	—			1,509
Bargain purchase gain	—		—			(4,012		)	—			—			—			(4,012		)
Other expense	7		—			154			224			2			—			387
Income (loss) before income taxes	$	1,369	$	(702	)	$	2,652		$	(13,314	)	$	(2,066	)	$	—		$	(12,061	)

	Pressure Pumping		Infrastructure		Sand		Drilling		All Other		Eliminations			Total
As of June 30, 2018:
Total assets(a)	$	277,895	$	341,171	$	199,421	$	92,578	$	150,579	$	(32,521	)	$	1,029,123
Goodwill	$	86,043	$	891	$	2,684	$	—	$	11,893	$	—		$	101,511
As of December 31, 2017:
Total assets(a)	$	297,140	$	205,275	$	190,859	$	88,527	$	243,767	$	(158,325	)	$	867,243
Goodwill	$	86,043	$	891	$	2,684	$	—	$	10,193	$	—		$	99,811

a. Total assets included in the All Other column include Mammoth LLC corporate assets totaling $34.3 million and $148.8 million, respectively, as of June 30, 2018 and December 31, 2017, of which $16.9 million and $137.4 million are inter-segment accounts receivable which are eliminated in consolidation.

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Organization and Nature of Business (Details) - $ / shares	Jun. 30, 2018	Jun. 29, 2018	Oct. 19, 2016	Nov. 24, 2014
Operating Entities
Business Acquisition [Line Items]
Shares issued in acquisition (in shares)				20,000,000
IPO
Business Acquisition [Line Items]
Shares issued (in shares)			7,750,000
Sale of stock, price per share (in USD per share)			$ 15.00
IPO | Mammoth Holdings, Gulfport and Rhino
Business Acquisition [Line Items]
Shares issued (in shares)			250,000
Secondary Public Offering | Gulfport
Business Acquisition [Line Items]
Shares issued (in shares)		4,000,000
Sale of stock, price per share (in USD per share)		$ 38.01
Underwrites option | Gulfport
Business Acquisition [Line Items]
Shares issued (in shares)		600,000
shares issued (in shares)	385,000

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Organization and Nature of Business - Schedule of Ownership (Details) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Share Count (in shares)	44,752,765	44,589,306
% Ownership	100.00%	100.00%
Wexford
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Share Count (in shares)	22,252,277	25,009,319
% Ownership	49.70%	56.10%
Gulfport
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Share Count (in shares)	9,943,645	11,171,887
% Ownership	22.20%	25.10%
Rhino
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Share Count (in shares)	104,100	568,794
% Ownership	0.20%	1.30%
Outstanding shares owned by related parties
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Share Count (in shares)	32,300,022	36,750,000
% Ownership	72.10%	82.50%

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Basis of Presentation and Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, Period Start	$ 21,737	$ 5,377
Additions charged to expense	53,790	16,206
Additions other		179
Deductions for uncollectible receivables written off	(1,758)	(25)
Balance, Period End	$ 73,769	$ 21,737

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Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Bad debt expense	$ 53,790	$ 16,206
Oil And Natural Gas Industry
Related Party Transaction [Line Items]
Bad debt expense	200	200
Puerto Rico Electric Power Authority (PREPA)
Related Party Transaction [Line Items]
Bad debt expense	$ 53,600	$ 16,000

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Basis of Presentation and Significant Accounting Policies - Concentration of Credit Risk and Significant Customers (Details) - Customer Concentration Risk			3 Months Ended		6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Customer A | REVENUES
Concentration Risk [Line Items]
Concentration risk, percentage			65.00%	0.00%	65.00%	0.00%
Customer A | ACCOUNTS RECEIVABLE
Concentration Risk [Line Items]
Concentration risk, percentage	59.00%	56.00%
Customer B | REVENUES
Concentration Risk [Line Items]
Concentration risk, percentage			9.00%	59.00%	11.00%	59.00%
Customer B | ACCOUNTS RECEIVABLE
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	12.00%

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Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue	$ 533,594	$ 98,262	$ 1,027,843	$ 173,228
Shortfall Payments
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue	$ 300		$ 300
Practical expedients
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract term (greater than)	1 year		1 year

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Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 533,594	$ 98,262	$ 1,027,843	$ 173,228
Pressure pumping services
Disaggregation of Revenue [Line Items]
Revenue	101,406	50,196	202,544	90,836
Infrastructure services
Disaggregation of Revenue [Line Items]
Revenue	360,250	1,709	685,709	1,709
Natural sand proppant services
Disaggregation of Revenue [Line Items]
Revenue	52,845	24,762	103,860	40,359
Contract land and directional drilling services
Disaggregation of Revenue [Line Items]
Revenue	17,210	12,472	32,440	23,223
Other services
Disaggregation of Revenue [Line Items]
Revenue	20,167	10,242	43,062	19,092
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	$ (18,284)	$ (1,119)	$ (39,772)	$ (1,991)

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Revenues - Performance Obligations and Contract Balances (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 15,000,000	$ 15,000,000
Contract assets	0	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 68,500,000
Contract term (greater than)	2 years 6 months

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Acquisitions - WTL Oil Acquisition (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2018	Jul. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Cash paid to acquire a business				$ 13,356	$ 39,570
WTL Oil LLC
Business Acquisition [Line Items]
Purchase price	$ 5,500
Consideration receivable	$ 600
Acquisition related costs			$ 100
Subsequent Event | WTL Oil LLC
Business Acquisition [Line Items]
Cash paid to acquire a business		$ 600

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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed WTL Oil (Details) - USD ($) $ in Thousands		6 Months Ended
	May 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 101,511	$ 99,811	$ 88,727
WTL Oil LLC
Business Acquisition [Line Items]
Property, plant and equipment	$ 2,960
Goodwill	1,567
Total assets acquired	6,107
Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)		3 years 11 months
Customer relationships | WTL Oil LLC
Business Acquisition [Line Items]
Identifiable intangible assets	930
Trade names
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)		9 years 1 month
Trade names | WTL Oil LLC
Business Acquisition [Line Items]
Identifiable intangible assets	$ 650
Minimum | WTL Oil LLC
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)	10 years
Maximum | WTL Oil LLC
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)	20 years

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Acquisitions - Pro Forma Information WTL Oil Acquisition (Details) - WTL Oil LLC - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Revenues	$ 595
Net income	5
Depreciation	100
Revenues	3,354	$ 1,553
Net income	$ 90	$ 62

XML

Acquisitions - RTS Energy Services Acquisition (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jun. 15, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Cash paid to acquire a business			$ 13,356	$ 39,570
RTS Energy Services LLC
Business Acquisition [Line Items]
Cash paid to acquire a business	$ 7,600
Consideration receivable	$ 500
Acquisition related costs		$ 0

XML

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed, RTS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 15, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 101,511		$ 99,811	$ 88,727
RTS Energy Services LLC
Business Acquisition [Line Items]
Inventories		$ 180
Property, plant and equipment		7,787
Goodwill		133
Total assets acquired		$ 8,100

XML

Acquisitions - Pro Forma RTS Acquisition (Details) - RTS Energy Services LLC - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Revenues	$ 630
Net income	7
Depreciation	100
Revenues	10,160	$ 8,326
Net income (loss)	$ (848)	$ 653

XML

Acquisitions - Acquisition of 5 Star Narrative (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Jul. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Cash paid to acquire a business		$ 13,356	$ 39,570
5 Star
Business Acquisition [Line Items]
Cash paid to acquire a business	$ 2,400
Acquisition related costs				$ 100

XML

Acquisitions - Schedule Of Assets Acquired and Liabilities Assumed 5 Star (Details) - USD ($) $ in Thousands		6 Months Ended
	Jul. 01, 2017	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 101,511	$ 99,811	$ 88,727
5 Star
Business Acquisition [Line Items]
Accounts receivable	$ 2,440
Property, plant and equipment	1,863
Goodwill	248
Total assets acquired	4,851
Long-term debt and other liabilities	2,413
Total liabilities assumed	2,413
Net assets acquired	$ 2,438
Finite-lived intangible asset, useful life (in years)	10 years
Trade names
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)		9 years 1 month
Trade names | 5 Star
Business Acquisition [Line Items]
Identifiable intangible assets - customer relationships	$ 300

XML

Acquisitions - Pro Forma, 5 Star (Details) - 5 Star - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Revenues	$ 86,720		$ 25,216
Net income	12,903		4,191
Depreciation	1,000		800
Revenues		$ 6,332
Net loss		$ (282)
Eliminations
Business Acquisition [Line Items]
Revenues	$ 77,500		$ 16,000

XML

Acquisitions - Acquisition of Higher Power Narrative (Details) - USD ($) $ in Thousands		6 Months Ended
	Apr. 21, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Cash paid to acquire a business		$ 13,356	$ 39,570
Higher Power
Business Acquisition [Line Items]
Cash paid to acquire a business	$ 3,300
Business combination, contingent consideration, liability	$ 800
Business combination, contingent consideration, payment term	3 years
Transaction related costs expensed				$ 100
Accrued Liabilities | Higher Power
Business Acquisition [Line Items]
Business combination, contingent consideration, liability		300
Other Liabilities | Higher Power
Business Acquisition [Line Items]
Business combination, contingent consideration, liability		$ 300

XML

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed. High Power Acquisition (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Apr. 21, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 101,511	$ 99,811		$ 88,727
Higher Power
Business Acquisition [Line Items]
Property, plant and equipment			$ 1,744
Goodwill			643
Total assets acquired			4,000
Customer relationships | Higher Power
Business Acquisition [Line Items]
Identifiable intangible assets - customer relationships			$ 1,613

XML

Acquisitions - Pro Forma Information High Power Acquisition (Details) - Higher Power - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Revenues	$ 122,734		$ 39,571
Net income	16,205		5,127
Depreciation	2,300		2,000
Revenues		$ 4,481
Net loss		$ (411)
Eliminations
Business Acquisition [Line Items]
Revenues	$ 111,400		$ 27,400

XML

Acquisitions - Narrative Sturgeon Acquisitions (Details) - Sturgeon Acquisitions LLC - USD ($) $ / shares in Units, $ in Millions	Jun. 05, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Shares issued in acquisition (in shares)	5,607,452
Business acquisition, share price (in dollars per share)	$ 18.50
Purchase price	$ 103.7
Transaction related costs expensed		$ 1.3

XML

Acquisitions - Chieftain Acquisition Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Cash paid to acquire a business	$ 13,356	$ 39,570
Chieftain Acquisition
Business Acquisition [Line Items]
Transaction related costs expensed			$ 800

XML

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed Chieftrain Sand and Proppant LLC (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 24, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Bargain purchase gain, net of tax		$ 0	$ (4,012)	$ 0	$ (4,012)
Chieftain Acquisition
Business Acquisition [Line Items]
Property, plant and equipment	$ 23,373
Sand reserves	20,910
Total assets acquired	44,283
Asset retirement obligation	1,732
Total liabilities assumed	1,732
Net assets acquired	42,551
Bargain purchase gain, net of tax	(6,231)
Total purchase price	36,320
Bargain purchase, gain recognized, tax amount	$ 2,200

XML

Acquisitions - Pro Forma Information Chieftain Sand and Proppant LLC (Details) - Chieftain Acquisition - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Revenues		$ 35,128	$ 22,847
Net income		10,694	5,520
Depreciation		2,300	2,800
Revenues	$ 1,312
Net loss	$ (72)
Eliminations
Business Acquisition [Line Items]
Revenues		$ 9,600	$ 12,300

XML

Acquisitions - Stingray Acquisition Narrative (Details) - Stingray Acquisitions $ / shares in Units, $ in Thousands	Jun. 05, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	May 12, 2017 agreement
Business Acquisition [Line Items]
Number of contribution agreements entered into | agreement			2
Shares issued in acquisition (in shares) | shares	1,392,548
Business acquisition, share price (in dollars per share) | $ / shares	$ 18.50
Purchase price	$ 25,762
Transaction related costs expensed		$ 200

XML

Acquisitions - Consideration Transferred Stingray Acquisition (Details) $ in Thousands	Jun. 05, 2017 USD ($)
Cementing
Business Acquisition [Line Items]
Purchase price	$ 12,975
SR Energy
Business Acquisition [Line Items]
Purchase price	12,787
Stingray Acquisitions
Business Acquisition [Line Items]
Purchase price	$ 25,762

XML

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed, Stingray (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 05, 2017	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 101,511	$ 99,811	$ 88,727
Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)		3 years 11 months
Trade names
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)		9 years 1 month
SR Energy
Business Acquisition [Line Items]
Cash and cash equivalents	$ 1,611
Accounts receivable, net	3,913
Receivables from related parties	3,684
Inventories	0
Prepaid expenses	35
Property, plant and equipment	13,061
Goodwill	3,929
Other assets	7
Total assets acquired	26,790
Accounts payable and accrued liabilities	5,890
Long-term debt	5,074
Deferred tax liability	3,039
Total liabilities assumed	14,003
Net assets acquired	12,787
SR Energy | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets	0
SR Energy | Trade names
Business Acquisition [Line Items]
Identifiable intangible assets	550
Cementing
Business Acquisition [Line Items]
Cash and cash equivalents	1,060
Accounts receivable, net	495
Receivables from related parties	1,418
Inventories	306
Prepaid expenses	32
Property, plant and equipment	7,459
Goodwill	6,264
Other assets	0
Total assets acquired	18,444
Accounts payable and accrued liabilities	2,063
Long-term debt	2,000
Deferred tax liability	1,406
Total liabilities assumed	5,469
Net assets acquired	12,975
Cementing | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets	1,140
Cementing | Trade names
Business Acquisition [Line Items]
Identifiable intangible assets	270
Stingray Acquisitions
Business Acquisition [Line Items]
Cash and cash equivalents	2,671
Accounts receivable, net	4,408
Receivables from related parties	5,102
Inventories	306
Prepaid expenses	67
Property, plant and equipment	20,520
Goodwill	10,193
Other assets	7
Total assets acquired	45,234
Accounts payable and accrued liabilities	7,953
Long-term debt	7,074
Deferred tax liability	4,445
Total liabilities assumed	19,472
Net assets acquired	25,762
Stingray Acquisitions | Customer relationships
Business Acquisition [Line Items]
Identifiable intangible assets	1,140
Stingray Acquisitions | Trade names
Business Acquisition [Line Items]
Identifiable intangible assets	$ 820
Minimum | Stingray Acquisitions
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)	5 years
Maximum | Stingray Acquisitions
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life (in years)	10 years

XML

Acquisitions - Pro Forma Stingray Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
SR Energy
Business Acquisition [Line Items]
Revenues	$ 16,034		$ 11,572
Net loss	(1,586)		(1,626)
Depreciation	2,800		3,400
Cementing
Business Acquisition [Line Items]
Revenues	5,131		7,500
Net loss	(806)		(1,963)
Depreciation	1,000		4,100
Stingray Acquisitions
Business Acquisition [Line Items]
Revenues		$ 18,333
Net loss		$ (1,612)
Eliminations | SR Energy
Business Acquisition [Line Items]
Revenues	$ 1,600		$ 600

XML

Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Supplies	$ 7,264	$ 9,437
Raw materials	321	219
Work in process	1,326	2,370
Finished goods	3,806	5,788
Total inventory	$ 12,717	$ 17,814

XML

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 695,961		$ 587,298
Deposits on equipment and equipment in process of assembly	33,349		20,348
Property, plant and equipment, gross	729,310		607,646
Less: accumulated depreciation	305,995		256,629
Property, plant and equipment, net	423,315		351,017
Accumulated depreciation for assets under capital leases	900		800
Proceeds from disposal of property and equipment	898	$ 781
Gain (loss) on disposal of property and equipment	128	(127)
Pressure pumping equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 199,333		190,211
Pressure pumping equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Pressure pumping equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Drilling rigs and related equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 137,075		132,260
Proceeds from disposal of property and equipment	600	300
Gain (loss) on disposal of property and equipment	$ 500	$ 200
Drilling rigs and related equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Drilling rigs and related equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 140,308		97,569
Assets under capital lease	$ 1,800		1,800
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	7 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Buildings
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 47,593		45,992
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	39 years
Vehicles, trucks and trailers
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 91,680		54,055
Assets under capital lease	$ 3,800		1,000
Vehicles, trucks and trailers | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Vehicles, trucks and trailers | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Coil tubing equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 28,068		28,053
Coil tubing equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	4 years
Coil tubing equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 14,183		11,317
Land improvements
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Property, plant, and equipment	$ 9,614		9,614
Rail improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 13,101		5,540
Rail improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	10 years
Rail improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Other property and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 15,006		$ 12,687
Other property and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	3 years
Other property and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	12 years

XML

Property, Plant and Equipment - Schedule of Depreciation, Amortization, Accretion, and Depletion (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 27,058	$ 17,229	$ 51,456	$ 32,196
Depletion expense	1,340	382	1,427	384
Amortization expense	2,382	2,268	4,790	4,536
Accretion expense	15	14	30	14
Depreciation, depletion, amortization and accretion	$ 30,795	$ 19,893	57,703	37,130
Depreciation expense for assets under capital leases			$ 400	$ 200

XML

Intangible Assets and Goodwill - Definite Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 12,930	$ 16,139
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	36,725	35,795
Less: accumulated amortization	(30,521)	(26,172)
Intangible assets, net	6,204	9,623
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	9,443	8,793
Less: accumulated amortization	$ (2,717)	$ (2,277)

XML

Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 2,382	$ 2,268	$ 4,790	$ 4,536
Goodwill	$ 101,511		$ 101,511		$ 99,811	$ 88,727
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			3 years 11 months
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			9 years 1 month
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			4 years
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			10 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			10 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)			20 years

XML

Intangible Assets and Goodwill - Aggregated Expected Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 3,969
2019	1,293
2020	1,293
2021	1,288
2022	1,266
Thereafter	3,821
Intangible assets, net	$ 12,930	$ 16,139

XML

Intangible Assets and Goodwill - Schedule Of Changes in Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, Period Start	$ 99,811	$ 88,727
Goodwill, Period End	101,511	99,811
Stingray Acquisitions
Goodwill [Roll Forward]
Additions		10,193
Higher Power
Goodwill [Roll Forward]
Additions		643
5 Star
Goodwill [Roll Forward]
Additions		$ 248
RTS Energy Services LLC
Goodwill [Roll Forward]
Additions	133
WTL Oil LLC
Goodwill [Roll Forward]
Additions	$ 1,567

XML

Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Deferred revenue	$ 15,100	$ 15,210
Accrued compensation, benefits and related taxes	19,917	11,552
Financed insurance premiums	1,638	4,876
Insurance reserves	4,183	2,942
State and local taxes payable	8,205	2,126
Other	5,658	4,189
Total	$ 54,701	$ 40,895

XML

Accrued Expenses and Other Current Liabilities - Narrative (Details)	Jun. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Financed insurance premium interest rate	2.75%	2.75%

XML

Debt (Details)			6 Months Ended
	Jun. 30, 2015 USD ($)	Nov. 25, 2014 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowing under the credit facility			$ 0	$ 99,900,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 170,000,000.0
Remaining borrowing capacity			$ 162,700,000	62,800,000
Maximum leverage ratio			4.0
Debt covenant, minimum availability required			$ 10,000,000
Letter of Credit
Line of Credit Facility [Line Items]
Remaining borrowing capacity			$ 6,500,000	$ 6,500,000
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line of Credit Facility [Line Items]
Increments of debt that can be converted		$ 500,000
Minimum | Revolving Credit Facility
Line of Credit Facility [Line Items]
Interest coverage rate			3.0
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate		3.00%
Sturgeon Acquisitions LLC | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000.0
Basis spread on variable rate	2.00%
Debt instrument, term	3 years
Sturgeon Acquisitions LLC | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.00%
Sturgeon Acquisitions LLC | Federal Fund Open Rate | Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%

XML

Other Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Capital lease obligations	$ 4,253	$ 2,015
Equipment financing arrangement	1,436	1,605
Other	250	500
Total	5,939	4,120
Less: Current portion of capital lease and equipment financing obligations included in accrued expenses and other current liabilities	(1,839)	(831)
Total Other Liabilities	$ 4,100	$ 3,289

XML

Other Liabilities (Details)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Financing arrangement, term	5 years
Financing arrangement, stated interest rate	4.60%
Capital Lease Obligations
Debt Instrument [Line Items]
Capital lease, weighted average implied interest rate	14.20%	19.10%

XML

Other Liabilities - Schedule of Future Payments Under Capital Lease (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Other Liabilities Disclosure [Abstract]
2018	$ 890
2019	2,593
2020	1,696
2021	664
2022	360
Total future minimum payments	6,203
Less interest payments	(514)
Present value of future minimum payments	$ 5,689

XML

Variable Interest Entity (Details)	Apr. 06, 2018
Dire Wolf Energy Services LLC | Cobra Aviation Services LLC
Variable Interest Entity [Line Items]
Interest transferred	100.00%

XML

Selling, General And Administrative Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Non-cash expenses:
Bad debt provision			$ 53,790		$ 16,206
Equity based compensation	$ 17,500		17,487	$ 0
Stock based compensation			2,916	1,620
Total SG&A expense	65,127	$ 7,700	103,638	14,437
Selling, General and Administrative Expenses
Cash expenses:
Compensation and benefits	10,978	2,966	18,677	5,381
Professional services	2,981	1,652	5,568	3,581
Other(a)	3,935	2,015	5,542	3,880
Total cash SG&A expense	17,894	6,633	29,787	12,842
Non-cash expenses:
Bad debt provision	28,263	17	53,790	(25)
Equity based compensation	17,487	0	17,487	0
Stock based compensation	1,483	1,050	2,574	1,620
Total non-cash SG&A expense	47,233	1,067	73,851	1,595
Total SG&A expense	$ 65,127	$ 7,700	$ 103,638	$ 14,437

XML

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Foreign current income tax expense	$ 67,665	$ 21	$ 125,712	$ 606
Foreign deferred income tax benefit	(15,266)	(14)	(25,386)	(20)
U.S. current income tax expense	1,636	0	1,624	0
U.S. deferred income tax benefit	(523)	(2,811)	(2,520)	(6,496)
Total	$ 53,512	$ (2,804)	$ 99,430	$ (5,910)

XML

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Contingency [Line Items]
Federal income tax rate		50.00%	37.00%
Tax cuts and jobs act of 2017, income tax expense (benefit)	$ (31.0)
Foreign Tax Credit
Income Tax Contingency [Line Items]
Change in deferred tax assets valuation allowance		$ 9.2

XML

Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 42,700	$ (1,170)	$ 98,246	$ (6,151)
Basic earnings (loss) per share:
Weighted average common shares outstanding (in shares)	44,737,000	39,500,000	44,700,000	38,506,000
Basic earnings (loss) per share (in USD per share)	$ 0.95	$ (0.03)	$ 2.20	$ (0.16)
Diluted earnings (loss) per share:
Weighted average common shares, including dilutive effect (in shares)	45,059,000	39,500,000	44,977,000	38,506,000
Diluted earnings (loss) per share (in USD per share)	$ 0.95	$ (0.03)	$ 2.18	$ (0.16)
Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)		0		0

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Equity Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Jun. 29, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based compensation (Note 15)		$ 17,500	$ 17,487	$ 0
Specified Member Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the award as of the modification dates or grant date		5,600	5,600
Non-Employees Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the award as of the modification dates or grant date		$ 43,100	$ 43,100
MEh Sub LLC | Secondary Public Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)	2,764,400
Sale of stock, price per share (in USD per share)	$ 38.01

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Stock Based Compensation (Details) - Restricted Stock	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Number of Unvested Restricted Shares
Unvested shares as of January 1, 2018 (in shares) | shares	640,632
Granted (in shares) | shares	93,556
Vested (in shares) | shares	(149,098)
Forfeited (in shares) | shares	0
Unvested shares as of June 30, 2018 (in shares) | shares	585,090
Weighted Average Grant-Date Fair Value
Unvested shares as of January 1, 2018 (in dollars per share) | $ / shares	$ 19.44
Granted (in dollars per share) | $ / shares	26.83
Vested (in dollars per share) | $ / shares	21.29
Forfeited (in dollars per share) | $ / shares	0.00
Unvested shares as of June 30, 2018 (in dollars per share) | $ / shares	$ 21.07

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Stock Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	4,500,000.0		4,500,000.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of the award as of the modification dates or grant date	$ 9.2		$ 9.2
Unrecognized compensation cost			22 months
Compensation expense	$ 1.7	$ 1.1	$ 2.9	$ 1.6

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Related Party Transactions - Revenues and Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
REVENUES	$ 50,341	$ 58,208	$ 110,891	$ 102,710
ACCOUNTS RECEIVABLE	30,674		30,674		$ 33,788
Pressure Pumping and Gulfport | Related parties
Related Party Transaction [Line Items]
REVENUES	33,831	41,100	72,377	72,845
ACCOUNTS RECEIVABLE	20,127		20,127		25,054
Muskie and Gulfport | Related parties
Related Party Transaction [Line Items]
REVENUES	9,730	13,605	21,192	25,145
ACCOUNTS RECEIVABLE	4,428		4,428		1,947
Panther Drilling and Gulfport | Related parties
Related Party Transaction [Line Items]
REVENUES	0	952	56	1,994
ACCOUNTS RECEIVABLE	12		12		872
Cementing and Gulfport | Related parties
Related Party Transaction [Line Items]
REVENUES	2,048	903	4,876	903
ACCOUNTS RECEIVABLE	1,739		1,739		2,255
SR Energy and Gulfport | Related parties
Related Party Transaction [Line Items]
REVENUES	4,626	1,565	11,579	1,565
ACCOUNTS RECEIVABLE	4,292		4,292		3,348
Panther Drilling and El Toro | Related parties
Related Party Transaction [Line Items]
REVENUES	0	0	345	0
ACCOUNTS RECEIVABLE	0		0		0
Redback Energy and El Toro | Related parties
Related Party Transaction [Line Items]
REVENUES	92	34	92	158
ACCOUNTS RECEIVABLE	0		0		0
Coil Tubing and El Toro | Related parties
Related Party Transaction [Line Items]
REVENUES	0	0	360	0
ACCOUNTS RECEIVABLE	(2)		(2)		0
Bison Drilling and Predator | Related parties
Related Party Transaction [Line Items]
REVENUES	0	0	0	0
ACCOUNTS RECEIVABLE	0		0		234
Other Relationships | Related parties
Related Party Transaction [Line Items]
REVENUES	14	$ 49	14	$ 100
ACCOUNTS RECEIVABLE	$ 78		$ 78		$ 78

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Related Party Transactions - Cost of Revenues of Accounts Payable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	$ 1,916		$ 1,916		$ 1,378
SELLING, GENERAL AND ADMINISTRATIVE COSTS	532	$ 307	961	$ 631
Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	2,428	262	4,220	692
ACCOUNTS PAYABLE	1,916		1,916		1,378
SELLING, GENERAL AND ADMINISTRATIVE COSTS	532	307	961	631
CAPITAL EXPENDITURES	2,332	0	3,904	0
Cobra and T&E | Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	1,486	0	2,762	0
CAPITAL EXPENDITURES	757	0	1,131	0
Higher Power and T&E | Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	950	0	1,458	0
CAPITAL EXPENDITURES	1,575	0	2,773	0
Panther and DBDHT | Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	0	0	0	128
The Company and 2017 Stingray Companies | Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	0	207	0	444
Other Relationships | Affiliated Entity
Related Party Transaction [Line Items]
COST OF REVENUE	(8)	55	0	120
SELLING, GENERAL AND ADMINISTRATIVE COSTS	42	20	56	53
The Company and Everest | Affiliated Entity
Related Party Transaction [Line Items]
SELLING, GENERAL AND ADMINISTRATIVE COSTS	55	50	86	108
The Company and Wexford | Affiliated Entity
Related Party Transaction [Line Items]
SELLING, GENERAL AND ADMINISTRATIVE COSTS	290	165	473	398
The Company and Caliber | Affiliated Entity
Related Party Transaction [Line Items]
SELLING, GENERAL AND ADMINISTRATIVE COSTS	145	$ 72	346	$ 72
ACCOUNTS PAYABLE | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	865		865		755
ACCOUNTS PAYABLE | Cobra and T&E | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	289		289		457
ACCOUNTS PAYABLE | Higher Power and T&E | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	576		576		3
ACCOUNTS PAYABLE | Panther and DBDHT | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	0		0		77
ACCOUNTS PAYABLE | The Company and 2017 Stingray Companies | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	0		0		0
ACCOUNTS PAYABLE | Other Relationships | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	0		0		218
SELLING, GENERAL AND ADMINISTRATIVE COSTS | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	131		131		172
SELLING, GENERAL AND ADMINISTRATIVE COSTS | Other Relationships | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	0		0		2
SELLING, GENERAL AND ADMINISTRATIVE COSTS | The Company and Everest | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	6		6		19
SELLING, GENERAL AND ADMINISTRATIVE COSTS | The Company and Wexford | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	78		78		150
SELLING, GENERAL AND ADMINISTRATIVE COSTS | The Company and Caliber | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	47		47		1
CAPITAL EXPENDITURES | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	920		920		451
CAPITAL EXPENDITURES | Cobra and T&E | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	170		170		66
CAPITAL EXPENDITURES | Higher Power and T&E | Affiliated Entity
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	$ 750		$ 750		$ 385

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Related Party Transactions - Narrative (Details) - Gulfport - Secondary Public Offering $ / shares in Units, $ in Millions	Jun. 29, 2018 USD ($) $ / shares shares
Related Party Transaction [Line Items]
Shares issued (in shares) | shares	4,000,000
Sale of stock, price per share (in USD per share) | $ / shares	$ 38.01
Stock issuance costs | $	$ 0.7

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Commitments and Contingencies - Future minimum lease payments (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Operating Leases
Remainder of 2018	$ 12,148
2019	18,091
2020	15,622
2021	12,029
2022	8,995
Thereafter	6,057
Total	72,942
Minimum Purchase Commitments
Remainder of 2018	19,254
2019	12,125
2020	400
2021	165
2022	0
Thereafter	0
Minimum Purchase Commitments	31,944
Capital Spend Commitments
Minimum Purchase Commitments
Remainder of 2018	16,393
2019	0
2020	0
2021	0
2022	0
Thereafter	0
Minimum Purchase Commitments	$ 16,393

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Commitments and Contingencies - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
	Jun. 27, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Other Commitments [Line Items]
Operating leases, rent expense			$ 10,200,000	$ 4,200,000
Insurance deductible		$ 300,000	300,000		$ 300,000
Insurance aggregate stop loss		2,000,000	2,000,000		2,000,000
Workers compensation and auto claims insurance, aggregate stop loss per claim basis		200,000	200,000
Workers compensation and auto claims insurance, aggregate stop loss per calendar year		5,800,000	5,800,000
Insurance reserves		4,183,000	4,183,000		2,942,000
Warranty accrual		0	0		0
Product warranty expense			0	$ 0
Commitments and contingencies
Maximum annual contributions per employee, percent			92.00%
Employer matching contribution, percent of match			3.00%
Employer discretionary contribution amount		1,800,000	$ 3,400,000
Outstanding Bid Bond
Other Commitments [Line Items]
Commitments and contingencies		1,100,000	1,100,000
Performance And Payment Bond
Other Commitments [Line Items]
Commitments and contingencies		1,600,000	1,600,000
Estimated cost to complete the project		$ 600,000	$ 600,000
Wendco Of Puerto Rico Inc, Multisystem Restaurant Inc, Restaurant Operators Inc, Apple Caribe, Inc
Other Commitments [Line Items]
Loss contingency, damages sought	$ 300,000,000

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Commitments and Contingencies - Schedule of Letters of Credit (Details) - Letter of Credit - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Total letters of credit	$ 6,523	$ 6,523
Environmental remediation
Line of Credit Facility [Line Items]
Total letters of credit	3,582	3,582
Insurance programs
Line of Credit Facility [Line Items]
Total letters of credit	2,486	2,486
Rail car commitments
Line of Credit Facility [Line Items]
Total letters of credit	$ 455	$ 455

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Reporting Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Revenue	$ 533,594	$ 98,262	$ 1,027,843	$ 173,228
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	339,828	77,340	665,929	135,838
Intersegment cost of revenues	0	0	0	0
Total cost of revenue	339,828	77,340	665,929	135,838
Selling, general and administrative	65,127	7,700	103,638	14,437
Depreciation, depletion, amortization and accretion	30,795	19,893	57,703	37,130
Impairment of long-lived assets	187	0	187	0
Operating income (loss)	97,657	(6,671)	200,386	(14,177)
Interest expense, net	959	1,112	2,196	1,509
Bargain purchase gain	0	(4,012)	0	(4,012)
Other expense	486	203	514	387
Income (loss) before income taxes	96,212	(3,974)	197,676	(12,061)
Total assets	1,029,123		1,029,123		$ 867,243
Accounts receivable, net	312,850		312,850		243,746
Goodwill	101,511		101,511		99,811	$ 88,727
Pressure Pumping
Segment Reporting Information [Line Items]
Revenue	100,333	49,924	196,912	90,377
Infrastructure services
Segment Reporting Information [Line Items]
Revenue	360,250	1,709	685,709	1,709
Sand
Segment Reporting Information [Line Items]
Revenue	37,439	24,000	73,942	38,912
Drilling
Segment Reporting Information [Line Items]
Revenue	17,126	12,472	32,354	23,223
All Other
Segment Reporting Information [Line Items]
Revenue	18,446	10,157	38,926	19,007
Intersegment revenues
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment revenues | Pressure Pumping
Segment Reporting Information [Line Items]
Revenue	1,073	272	5,632	459
Intersegment revenues | Infrastructure services
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment revenues | Sand
Segment Reporting Information [Line Items]
Revenue	15,406	762	29,918	1,447
Intersegment revenues | Drilling
Segment Reporting Information [Line Items]
Revenue	84	0	86	0
Intersegment revenues | All Other
Segment Reporting Information [Line Items]
Revenue	1,721	85	4,136	85
Eliminations
Segment Reporting Information [Line Items]
Revenue	(18,284)	(1,119)	(39,772)	(1,991)
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	0	0	0	0
Intersegment cost of revenues	(18,036)	(1,119)	(39,782)	(1,991)
Total cost of revenue	(18,036)	(1,119)	(39,782)	(1,991)
Selling, general and administrative	0	0	0	0
Depreciation, depletion, amortization and accretion	0	0	0	0
Impairment of long-lived assets	0		0
Operating income (loss)	(248)	0	10	0
Interest expense, net	0	0	0	0
Bargain purchase gain		0		0
Other expense	0	0	0	0
Income (loss) before income taxes	(248)	0	10	0
Total assets	(32,521)		(32,521)		(158,325)
Goodwill	0		0		0
Eliminations | All Other
Segment Reporting Information [Line Items]
Accounts receivable, net	16,900		16,900		137,400
Operating Segments | Pressure Pumping
Segment Reporting Information [Line Items]
Revenue	101,406	50,196	202,544	90,836
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	61,593	35,826	128,205	64,533
Intersegment cost of revenues	16,174	847	31,576	1,532
Total cost of revenue	77,767	36,673	159,781	66,065
Selling, general and administrative	20,822	2,403	23,485	4,180
Depreciation, depletion, amortization and accretion	13,829	9,626	27,815	18,784
Impairment of long-lived assets	0		0
Operating income (loss)	(11,012)	1,494	(8,537)	1,807
Interest expense, net	341	303	845	431
Bargain purchase gain		0		0
Other expense	80	4	92	7
Income (loss) before income taxes	(11,433)	1,187	(9,474)	1,369
Total assets	277,895		277,895		297,140
Goodwill	86,043		86,043		86,043
Operating Segments | Infrastructure services
Segment Reporting Information [Line Items]
Revenue	360,250	1,709	685,709	1,709
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	210,189	1,626	404,265	1,712
Intersegment cost of revenues	754	0	2,545	0
Total cost of revenue	210,943	1,626	406,810	1,712
Selling, general and administrative	39,786	307	71,637	355
Depreciation, depletion, amortization and accretion	4,094	340	6,501	340
Impairment of long-lived assets	0		0
Operating income (loss)	105,427	(564)	200,761	(698)
Interest expense, net	106	4	182	4
Bargain purchase gain		0		0
Other expense	330	0	332	0
Income (loss) before income taxes	104,991	(568)	200,247	(702)
Total assets	341,171		341,171		205,275
Goodwill	891		891		891
Operating Segments | Sand
Segment Reporting Information [Line Items]
Revenue	52,845	24,762	103,860	40,359
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	35,117	19,974	68,447	32,582
Intersegment cost of revenues	1,019	267	5,305	454
Total cost of revenue	36,136	20,241	73,752	33,036
Selling, general and administrative	1,787	2,416	3,431	4,474
Depreciation, depletion, amortization and accretion	3,881	2,206	6,197	3,569
Impairment of long-lived assets	0		0
Operating income (loss)	11,041	(101)	20,480	(720)
Interest expense, net	76	353	156	486
Bargain purchase gain		(4,012)		(4,012)
Other expense	36	140	23	154
Income (loss) before income taxes	10,929	3,418	20,301	2,652
Total assets	199,421		199,421		190,859
Goodwill	2,684		2,684		2,684
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue	17,210	12,472	32,440	23,223
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	15,280	12,033	29,755	22,986
Intersegment cost of revenues	(40)	0	122	0
Total cost of revenue	15,240	12,033	29,877	22,986
Selling, general and administrative	1,591	1,435	2,844	2,728
Depreciation, depletion, amortization and accretion	5,349	4,974	9,704	9,942
Impairment of long-lived assets	187		187
Operating income (loss)	(5,157)	(5,970)	(10,172)	(12,433)
Interest expense, net	265	440	660	657
Bargain purchase gain		0		0
Other expense	32	60	72	224
Income (loss) before income taxes	(5,454)	(6,470)	(10,904)	(13,314)
Total assets	92,578		92,578		88,527
Goodwill	0		0		0
Operating Segments | All Other
Segment Reporting Information [Line Items]
Revenue	20,167	10,242	43,062	19,092
Cost of revenue, exclusive of depreciation, depletion, amortization and accretion	17,649	7,881	35,257	14,025
Intersegment cost of revenues	129	5	234	5
Total cost of revenue	17,778	7,886	35,491	14,030
Selling, general and administrative	1,141	1,139	2,241	2,700
Depreciation, depletion, amortization and accretion	3,642	2,747	7,486	4,495
Impairment of long-lived assets	0		0
Operating income (loss)	(2,394)	(1,530)	(2,156)	(2,133)
Interest expense, net	171	12	353	(69)
Bargain purchase gain		0		0
Other expense	8	(1)	(5)	2
Income (loss) before income taxes	(2,573)	$ (1,541)	(2,504)	$ (2,066)
Total assets	150,579		150,579		243,767
Goodwill	11,893		11,893		10,193
Corporate | All Other
Segment Reporting Information [Line Items]
Total assets	$ 34,300		$ 34,300		$ 148,800

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Subsequent Events (Details) - USD ($)	Jul. 16, 2018	Jul. 10, 2018	Jul. 09, 2018	Aug. 14, 2018	Aug. 07, 2018	Jun. 30, 2018
Subsequent Event [Line Items]
Lease aggregate commitments						$ 72,942,000
Purchase obligation						$ 31,944,000
Subsequent Event
Subsequent Event [Line Items]
Unsatisfied performance obligation increase		$ 88,800,000
Dividends declared (in dollars per share)	$ 0.125
Lease aggregate commitments					$ 2,400,000.0
Subsequent Event | Equipment
Subsequent Event [Line Items]
Purchase obligation					9,600,000
Air Charter Agreement | Infrastructure services | Subsequent Event
Subsequent Event [Line Items]
Purchase obligation					2,500,000
Barge Chartering | Infrastructure services | Subsequent Event
Subsequent Event [Line Items]
Purchase obligation					2,100,000
Housing Service Agreement | Infrastructure services | Subsequent Event
Subsequent Event [Line Items]
Purchase obligation					$ 600,000
Revolving Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Dividend pro forma excess availability, maximum, percent			22.50%
Dividend payment after declaration term, maximum			60 days
Scenario, Forecast
Subsequent Event [Line Items]
Dividends payable				$ 5,600,000