10-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2018

or

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

For the transition period from                      to                  

Commission File Number:  001-34547

Cloud Peak Energy Inc.

(Exact name of registrant as specified in its charter)

Delaware	26-3088162
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

505 S. Gillette Ave., Gillette, Wyoming	82716
(Address of principal executive offices)	(Zip Code)

(307) 687-6000

(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.

x  Yes      o  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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

x  Yes      o  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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.  (Check one):

Large accelerated filer	Accelerated filer	Non-accelerated filer (Do not check if a smaller reporting company)	Smaller reporting company	Emerging growth company
o	x	o	o	o

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

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

o  Yes      x  No

Number of shares outstanding of Cloud Peak Energy Inc.’s common stock, as of the latest practicable date: Common stock, $0.01 par value per share, 75,772,193 shares outstanding as of April 18, 2018.

CLOUD PEAK ENERGY INC.

TABLE OF CONTENTS

		Page
	PART I — FINANCIAL INFORMATION
Item 1	Financial Statements —
	Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) for the Three Months Ended March 31, 2018 and 2017	1
	Unaudited Condensed Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017	2
	Unaudited Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2018 and 2017	3
	Notes to Unaudited Condensed Consolidated Financial Statements	4
Cautionary Notice Regarding Forward-Looking Statements		38
Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	41
Item 3	Quantitative and Qualitative Disclosures About Market Risk	54
Item 4	Controls and Procedures	55
	PART II — OTHER INFORMATION
Item 1	Legal Proceedings	56
Item 1A	Risk Factors	56
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	57
Item 3	Defaults Upon Senior Securities	57
Item 4	Mine Safety Disclosures	57
Item 5	Other Information	57
Item 6	Exhibits	57

Unless the context indicates otherwise, the terms “Cloud Peak Energy,” the “Company,” “we,” “us,” and “our” refer to Cloud Peak Energy Inc. (“CPE Inc.”) and its subsidiaries.

i

PART I — FINANCIAL INFORMATION

Item 1.       Financial Statements.

CLOUD PEAK ENERGY INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF

OPERATIONS AND COMPREHENSIVE INCOME (LOSS)

(in thousands, except per share data)

	Three Months Ended
	March 31,
	2018			2017
Revenue	$	216,309		$	195,728
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	192,534			170,269
Depreciation and depletion	14,996			18,645
Accretion	1,706			1,821
(Gain) loss on derivative financial instruments	—			2,344
Selling, general and administrative expenses	7,318			10,976
Debt restructuring costs	—			40
Other operating costs	126			176
Total costs and expenses	216,680			204,271
Operating income (loss)	(371		)	(8,543		)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	1,617			1,592
Interest income	263			39
Interest expense	(9,188		)	(12,912		)
Other, net	(268		)	(310		)
Total other income (expense)	(7,576		)	(11,591		)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(7,947		)	(20,134		)
Income tax benefit (expense)	(63		)	(300		)
Income (loss) from unconsolidated affiliates, net of tax	272			326
Net income (loss)	(7,738		)	(20,108		)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837		)	(1,821		)
Income tax on postretirement medical and pension changes	—			—
Other comprehensive income (loss)	(1,837		)	(1,821		)
Total comprehensive income (loss)	$	(9,575	)	$	(21,929	)
Income (loss) per common share:
Basic	$	(0.10	)	$	(0.30	)
Diluted	$	(0.10	)	$	(0.30	)
Weighted-average shares outstanding - basic	75,329			66,132
Weighted-average shares outstanding - diluted	75,329			66,132

The accompanying notes are an integral part of these Unaudited Condensed Consolidated Financial Statements.

1

CLOUD PEAK ENERGY INC.

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands)

	March 31,			December 31,
	2018			2017
ASSETS
Current assets
Cash and cash equivalents	$	127,796		$	107,948
Accounts receivable	45,025			50,075
Due from related parties	—			122
Inventories, net	70,347			72,904
Income tax receivable	232			256
Other prepaid and deferred charges	23,769			36,964
Other assets	802			1,765
Total current assets	267,971			270,034
Noncurrent assets
Property, plant and equipment, net	1,354,999			1,365,755
Goodwill	2,280			2,280
Income tax receivable	29,454			29,454
Other assets	34,431			31,178
Total assets	$	1,689,135		$	1,698,701
LIABILITIES AND EQUITY
Current liabilities
Accounts payable	$	25,590		$	29,832
Royalties and production taxes	54,775			54,327
Accrued expenses	37,919			32,818
Due to related parties	71			—
Current portion of federal coal lease obligations	379			—
Other liabilities	2,195			2,435
Total current liabilities	120,929			119,412
Noncurrent liabilities
Senior notes	406,261			405,266
Federal coal lease obligations, net of current portion	1,404			—
Asset retirement obligations, net of current portion	100,817			99,297
Accumulated postretirement medical benefit obligation, net of current portion	25,303			24,958
Royalties and production taxes	28,592			21,896
Other liabilities	6,996			20,063
Total liabilities	690,302			690,892
Commitments and Contingencies (Note 17)
Equity
Common stock ($0.01 par value; 200,000 shares authorized; 76,146 and 75,644 shares issued and 75,669 and 75,167 outstanding as of March 31, 2018 and December 31, 2017, respectively)	757			752
Treasury stock, at cost (477 shares as of both March 31, 2018 and December 31, 2017)	(6,498		)	(6,498		)
Additional paid-in capital	653,176			652,702
Retained earnings	339,429			347,046
Accumulated other comprehensive income (loss)	11,969			13,807
Total equity	998,833			1,007,809
Total liabilities and equity	$	1,689,135		$	1,698,701

The accompanying notes are an integral part of these Unaudited Condensed Consolidated Financial Statements.

2

CLOUD PEAK ENERGY INC.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Three Months Ended
	March 31,
	2018			2017
Cash flows from operating activities
Net income (loss)	$	(7,738	)	$	(20,108	)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and depletion	14,996			18,645
Accretion	1,706			1,821
Loss (income) from unconsolidated affiliates, net of tax	(272		)	(326		)
Distributions of income from unconsolidated affiliates	1,000			3,000
Equity-based compensation expense	(1,709		)	1,823
(Gain) loss on derivative financial instruments	—			2,344
Cash received (paid) on derivative financial instrument settlements	—			(336		)
Non-cash interest expense related to early retirement of debt and refinancings	—			702
Net periodic postretirement benefit costs	(1,421		)	(1,368		)
Addback of debt restructuring costs	—			40
Payments for logistics contracts	(2,500		)	(13,563		)
Logistics throughput contract amortization expense	4,161			10,578
Other	2,075			2,150
Changes in operating assets and liabilities:
Accounts receivable	5,050			16,613
Inventories, net	2,523			(1,373		)
Due to or from related parties	193			(419		)
Other assets	6,524			(8,024		)
Accounts payable and accrued expenses	(327		)	7,744
Asset retirement obligations	(185		)	(248		)
Net cash provided by (used in) operating activities	24,076			19,695
Investing activities
Purchases of property, plant and equipment	(2,646		)	(4,124		)
Investment in development projects	(360		)	—
Net cash provided by (used in) investing activities	(3,006		)	(4,124		)
Financing activities
Principal payments on federal coal leases	(574		)	—
Repayment of senior notes	—			(62,094		)
Payment of debt refinancing costs	—			(402		)
Payment of debt restructuring costs	—			(40		)
Proceeds from issuance of common stock	—			68,850
Cash paid for equity offering	—			(4,434		)
Other	(648		)	(644		)
Net cash provided by (used in) financing activities	(1,222		)	1,236
Net increase (decrease) in cash, cash equivalents, and restricted cash	19,848			16,807
Cash, cash equivalents, and restricted cash at beginning of period	108,673			84,433
Cash, cash equivalents, and restricted cash at end of period	$	128,521		$	101,240

The accompanying notes are an integral part of these Unaudited Condensed Consolidated Financial Statements.

3

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1.  Organization and Business

We are one of the largest producers of coal in the United States of America (“U.S.”) and the Powder River Basin (“PRB”), based on our 2017 coal sales.  We operate some of the safest mines in the coal industry.  According to the most current Mine Safety and Health Administration (“MSHA”) data, we have one of the lowest employee all injury incident rates among the largest U.S. coal producing companies.  We currently operate solely in the PRB, the lowest cost region of the major coal producing regions in the U.S., where we own and operate three surface coal mines: the Antelope Mine, the Cordero Rojo Mine, and the Spring Creek Mine.

Our Antelope Mine and Cordero Rojo Mine are located in Wyoming and our Spring Creek Mine is located in Montana.  Our mines produce subbituminous thermal coal with low sulfur content, and we sell our coal primarily to domestic and foreign electric utilities.  Thermal coal is primarily consumed by electric utilities and industrial consumers as fuel for electricity generation.  In 2017, the coal we produced generated approximately 2% of the electricity produced in the U.S.  We do not produce any metallurgical coal.

In addition, we have two development projects, both located in the Northern PRB.  For purposes of this report, the term “Northern PRB” refers to the area within the PRB that lies within Montana and the northern part of Sheridan County, Wyoming.  The Youngs Creek project is an undeveloped surface mine project located in Wyoming, seven miles south of our Spring Creek Mine and contiguous with the Wyoming-Montana state line.  The Big Metal project is located near the Youngs Creek project on the Crow Indian Reservation in southeast Montana.

Our logistics business provides a variety of services designed to facilitate the sale and delivery of coal.  These services include the purchase of coal from third parties or from our owned and operated mines, coordination of the transportation and delivery of purchased coal, negotiation of take-or-pay rail agreements and take-or-pay port agreements and demurrage settlement with vessel operators.  See Note 5 for further discussion.

Principles of Consolidation

The accompanying Unaudited Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).  In accordance with U.S. GAAP for interim financial statements, these Unaudited Condensed Consolidated Financial Statements do not include certain information and footnote disclosures that are required to be included in annual financial statements prepared in conformity with U.S. GAAP.  The year-end Unaudited Condensed Consolidated Balance Sheet data was derived from the Audited Consolidated Financial Statements.  Accordingly, these Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Audited Consolidated Financial Statements as of December 31, 2017 and 2016, and for each of the three years ended December 31, 2017, included in our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”).  In the opinion of management, the accompanying Unaudited Condensed Consolidated Financial Statements contain all adjustments, which are of a normal and recurring nature, necessary for a fair statement of our financial position as of March 31, 2018, and the results of our operations, comprehensive income (loss), and cash flows for the three months ended March 31, 2018 and 2017, in conformity with U.S. GAAP.  Our results of operations for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for future quarters or for the year ending December 31, 2018.

The preparation of our Unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires our management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods.  Significant estimates in these Unaudited Condensed Consolidated Financial Statements include: assumptions about the amount and timing of future cash flows and related discount rates used in determining asset retirement obligations (“AROs”) and in testing long-lived assets and goodwill for impairment; the fair value of derivative financial instruments; the calculation of mineral reserves; equity-based compensation expense; workers’ compensation claims; reserves for

4

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

contingencies and litigation; useful lives of long-lived assets; postretirement employee benefit obligations; the recognition and measurement of income tax benefits and related deferred tax asset valuation allowances; and allowances for inventory obsolescence and net realizable value.  Actual results could differ materially from those estimates.

Due to the tabular presentation of rounded amounts, certain tables reflect insignificant rounding differences.

2.  Accounting Policies and Standards Update

Recently Issued Accounting Pronouncements

From time to time, the Financial Accounting Standards Board (“FASB”) or other standard setting bodies issue new accounting pronouncements.  Updates to the FASB Accounting Standards Codification are communicated through issuance of an Accounting Standards Update (“ASU”).  Unless otherwise discussed, we believe that the impact of recently issued guidance will not be material to our consolidated financial statements upon adoption.

In February 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”), which allows companies to make a one-time reclassification of the stranded tax effects (as defined by ASU 2018-02) from accumulated other comprehensive income to retained earnings as a result of the tax legislation enacted in December 2017, commonly known as the “Tax Cuts and Jobs Act” (“TCJA”), and requires certain disclosures about stranded tax effects.  The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.  Early adoption is permitted.  The amendments in this update should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effects of the change in the U.S. federal corporate income tax rate in the TCJA is recognized.  We are still evaluating the impact the adoption of ASU 2018-02 will have.  We will adopt the new standard as of January 1, 2019.

In January 2017, the FASB issued ASU 2017-04, Goodwill — Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which eliminates the second step in the goodwill impairment test whereby a company measures an impairment loss by calculating the implied fair value of goodwill of a reporting unit and comparing it against its carrying value.  As a result, a goodwill impairment loss will be calculated by comparing the fair value of a reporting unit with its carrying amount.  The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years.  Early adoption is permitted.  The amendments in this update should be applied prospectively, with added disclosure regarding the nature of and reason for the change in accounting principal.  We will adopt the new standard as of January 1, 2020.

In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”), which would require the lessee to recognize the assets and liabilities on all leases that may have not been recognized in the past.  The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.  We will adopt the new standard effective January 1, 2019.  The amendments in this update should be applied at the beginning of the earliest period presented using a modified retrospective approach.  We began our review of our contracts with vendors in 2017 and will continue to evaluate the impact of the adoption of ASU 2016-02 throughout 2018.  However, based upon our initial reviews and the future payments under operating leases disclosed in our 2017 Form 10-K, we do not currently anticipate that adoption of this standard will have a significant impact on our results of operations, financial position, and cash flows.

Recently Adopted Accounting Pronouncements

In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation — Scope of Modification Accounting (“ASU 2017-09”), which provides guidance about the types of changes to terms or

5

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

conditions of a share-based payment award that would require an entity to apply modification accounting.  The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied prospectively to an award modified on or after the adoption date.  We adopted this standard on January 1, 2018.

In March 2017, the FASB issued ASU 2017-07, Compensation — Retirement Benefits — Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Cost (“ASU 2017-07”), which requires separate presentation of service costs and all other components of net benefit costs on the income statement.  Under ASU 2017-07, service cost is included in the same line item as other compensation costs arising from services rendered by employees during the period, with all other components of net benefit costs on the income statement outside of income from operations.  The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  We adopted this standard on January 1, 2018.  We retrospectively adopted the presentation of service costs separate from the other components of net periodic costs.  The interest costs and amortization of prior service costs have been reclassified from Cost of product sold and Selling, general and administrative expenses to Net periodic postretirement benefit income (cost), excluding service cost.

The effect of the retrospective presentation change related to the net periodic cost of our other postretirement employee benefits (“OPEB”) plan on our Unaudited Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) for the three months ended March 31, 2017 was as follows (in thousands):

	Three Months Ended
	March 31, 2017
	Previously Reported			Adjustment			As Revised
Cost of product sold	$	168,939		$	1,330		$	170,269
Selling, general and administrative expenses	$	10,714		$	262		$	10,976
Operating income (loss)	$	(6,951	)	$	(1,592	)	$	(8,543	)
Net periodic postretirement benefit income (cost), excluding service cost	$	—		$	1,592		$	1,592
Total other income (expense)	$	(13,183	)	$	1,592		$	(11,591	)

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows — Restricted Cash (“ASU 2016-18”), which requires the statement of cash flows to explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents.  The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied using a retrospective transition method to each period presented.  We adopted this standard on January 1, 2018.  Refer to Note 19, as well as the Unaudited Condensed Consolidated Statements of Cash Flows, for further information regarding the reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents.

In October 2016, the FASB issued ASU 2016-16, Accounting for Income Taxes — Intra-Entity Asset Transfers of Assets other than Inventory (“ASU 2016-16”), which would require the recognition of the tax expense from the sale of an asset other than inventory when the transfer occurs, rather than when the asset is sold to a third party or otherwise recovered through use.  The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption.  We adopted this standard on January 1, 2018.  We completed a

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CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

review of our intra-entity transfers as of December 31, 2017, and determined that ASU 2016-16 does not have an impact on our Unaudited Condensed Consolidated Financial Statements.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), which standardizes cash flow statement classification of certain transactions, including cash payments for debt prepayment or extinguishment, proceeds from insurance claim settlements, and distributions received from equity method investments.  The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied using a retrospective transition method to each period presented.  If impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable.  We adopted this standard on January 1, 2018, with no impact on our Unaudited Condensed Consolidated Statements of Cash Flows.

From May 2014 through December 2016, the FASB issued several ASUs related to Revenue from Contracts with Customers (“ASC 606”).  These ASUs are intended to provide greater insight into both revenue that has been recognized and revenue that is expected to be recognized in the future from existing contracts.  The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services.  The new guidance is effective for interim and annual periods beginning after December 15, 2017.  The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application.  We have adopted the new standard as of January 1, 2018 and utilized the modified retrospective method.  This approach allowed us to apply the new standard to (1) all new contracts entered into after January 1, 2018 and (2) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to equity.  Consolidated revenue presented in our comparative financial statements for periods prior to January 1, 2018 has not been revised and continues to be reported under legacy revenue recognition guidance.

The following table reflects the adoption of ASC 606 on our Unaudited Condensed Consolidated Balance Sheets as of January 1, 2018 (in thousands):

	Balance as of December 31, 2017		Adjustment Due to ASC 606			Balance as of January 1, 2018
Assets
Accounts receivable	$	50,075	$	781		$	50,856
Inventories, net	$	72,904	$	(660	)	$	72,244
Equity
Retained Earnings	$	347,046	$	121		$	347,167

As part of the adoption of ASC 606, we also will not recognize approximately 64,400 tons that were delivered in January 2018 in our tons sold figure for 2018.  These tons were delivered on a contract where title transferred to the customer upon delivery, while risk of loss transferred at the shipping point, or the mine.  Under legacy revenue recognition guidance, the revenue related to these tons was recognized upon delivery.  However, under ASC 606, revenue is now recognized at the shipping point, as this is when control passes to the customer.  As of December 31, 2017, these tons were appropriately placed back into inventory in accordance with legacy revenue recognition guidance.  The revenue recognition process was complete upon adoption of ASC 606 on January 1, 2018.

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CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

3.  Revenue

In accordance with the new revenue standard requirements, the disclosure of the impact of the adoption of ASC 606 on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) and Unaudited Condensed Consolidated Balance Sheets is as follows (in thousands):

	Three Months Ended
	March 31, 2018
	As Reported			Balances Without the Adoption of ASC 606			Effect of Change Higher (Lower)
Revenue	$	216,309		$	217,091		$	(781	)
Cost of product sold	$	192,534		$	193,194		$	(660	)
Net income (loss)	$	(7,738	)	$	(7,617	)	$	(121	)
Income (loss) per common share:
Basic	$	(0.10	)	$	(0.10	)	$	—
Diluted	$	(0.10	)	$	(0.10	)	$	—

	March 31, 2018
	As Reported		Balances Without the Adoption of ASC 606		Effect of Change Higher (Lower)
Accounts receivable	$	45,025	$	45,025	$	—
Inventories, net	$	70,347	$	70,347	$	—
Retained earnings	$	339,429	$	339,429	$	—

Revenue from Contracts with Customers

We account for a contract with a customer when the parties have approved the contract and are committed to performing their respective obligations, the rights of each party are identified, payment terms are identified, the contract has commercial substance, and collectability of consideration is probable.  We recognize revenue when we satisfy a performance obligation by transferring control of a good or service to a customer.

Our revenue is derived from sales to customers of coal produced at our facilities and coal purchased from other companies.  We categorize our customers by how we sell coal to them.  Our mine customers purchase coal directly from our mine sites, where the sale occurs at the mine site and where title, risk of loss, and control typically pass to the customer at that point.  This revenue is generally recorded in our Owned and Operated Mines Segment.  Mine customers arrange for and bear the costs of transporting their coal from our mines to their plants or other specified discharge points.  Our mine customers are typically domestic utility companies primarily located in the mid-west and south central U.S., although we also sell to other domestic utility companies, as well as to third-party brokers.  Our coal sales agreements with our mine customers are generally fixed-price, fixed-volume supply contracts, or include a pre-determined escalation in price for each year.  Some of our customer contracts may include variable pricing and volumes.  Price re-opener and index provisions may allow either party to commence a renegotiation of the contract price at a pre-determined time.  Price re-opener provisions may automatically set a new price based on prevailing market price or, in some instances, require us to negotiate a new price, sometimes within specified ranges of prices.  In some agreements, if the parties do not agree on a new price, either party has an option to terminate the contract.  Under some of our contracts, we have the right to

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CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

match lower prices offered to our customers by other suppliers.  The terms of our coal sales agreements result from competitive bidding and extensive negotiations with customers.  Consequently, the terms of these contracts vary by customer.

Our logistics customers purchase coal from us, along with logistics services to deliver the coal to the customer at a terminal or the customer’s plant or other delivery point remote from our mine site.  Title, risk of loss, and control pass to the customer at the remote delivery point.  This revenue is recorded in our Logistics and Related Activities Segment.  Our logistics services are designed to facilitate the sale and delivery of coal.  These services include the purchase of coal from third parties or from our owned and operated mines, coordination of the transportation and delivery of purchased coal, negotiation of take-or-pay rail agreements and take-or-pay port agreements and demurrage settlements with vessel operators.  We also bear the costs of transporting the coal to the delivery point.  For our international customers, this means that we cover the costs associated with an export terminal located in the Pacific Northwest.  Refer to Note 5 for further information.  Our logistics customers located overseas are generally responsible for paying the cost of ocean freight, although occasionally we may arrange or be responsible for the cost of that transportation as well.  Logistics customers are primarily foreign and domestic utility companies as well as third-party brokers.  With respect to our international sales, at present, we are primarily focused on end-user customers.  However, a small portion of our sales are made to international traders who sell on to end-user customers.  Our coal sales agreements with our domestic logistics customers are generally fixed-price, fixed-volume supply contracts with terms of one to three years.  The terms of our coal sales agreements result from competitive bidding and extensive negotiations with customers.  Consequently, the terms of these contracts vary by customer.  With our international logistics customers, we often enter into contracts that contain multi-year terms with future year pricing to be agreed upon, meaning that there is an expectation of sales, provided that mutual agreement on pricing can be reached.  This is consistent with conventional industry standards for sales into the Asian Pacific region.  We typically agree upon volumes and pricing under these international customer agreements three to six months in advance of shipment.  Our Asian delivered shipments are typically priced broadly in line with a number of relevant international coal indices adjusted for energy content and other quality and delivery criteria.  These indices include the Newcastle benchmark price, as published by Global Coal and others, and the Platts Kalimantan 5000.  Contracts with our logistics customers include terms similar to those described for our mine customers and may also include terms relating to: demurrage fees for international contracts, fixed pricing for the current year of sales, and additional coal quality requirements.

Coal sales agreements with both mine and logistics customers typically contain coal quality specifications.  With coal quality specifications in place, the raw coal sold by us to the customer at the delivery point must be substantially free of magnetic material and other foreign material impurities, and crushed to a maximum size as set forth in the respective coal sales agreement.  Prior to billing the customer, price adjustments are made based on quality standards that are specified in the coal sales agreement, such as Btu factor, moisture, ash, and sodium content and can result in either increases or decreases in the value of the coal shipped.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Disaggregation of Revenue

In the following table, Revenue is disaggregated by primary geographic markets, as we believe this best depicts how the nature, amount, timing, and uncertainty of our revenue and cash flows are affected by economic factors (in thousands):

	Three Months Ended
	March 31,
	2018		2017
United States (1)	$	138,232	$	170,866
South Korea (2)	66,021		16,961
Other (2)	12,056		7,901
Total revenue from external customers	$	216,309	$	195,728

(1)The majority of our domestic revenue is attributable to the Owned and Operated segment.

(2)All South Korean revenue and the majority of Other geographical revenue is attributable to our Logistics and Related Activities segment.

We attribute revenue to individual countries based on the location of the physical delivery of the coal.  All of our revenue for the three months ended March 31, 2018 and 2017 originated in the United States.

Performance Obligations

A performance obligation is a promise in a contract with a customer to provide distinct goods or services.  Performance obligations are the unit of account for purposes of applying the revenue recognition standard and therefore determine when and how revenue is recognized.  In most of our contracts, the customer contracts with us to provide coal that meets certain quality criteria, and, for our logistics customers, delivery of that coal to a certain destination.  These promises are highly interrelated and interdependent, and cannot be transferred to the customer without the other promises in the contract also being fulfilled.  As such, these promises are not separately identifiable within the context of the contract, and therefore, are not distinct.  Therefore, the entire contract is accounted for as one performance obligation.  We allocate the transaction price based on the base price per the contract, which is also the standalone selling price, increased or decreased for quality adjustments.

Under ASC 606, shipping and handling services may be considered a separate performance obligation if control of the goods transfers to the customer before shipment, but the entity has promised to ship the goods, or arrange for their shipment.  In contrast, if control of a good does not transfer to the customer before shipment, shipping is not a promised service to the customer.  This is because shipping is a fulfillment activity as the costs are incurred as part of transferring the goods to the customer.  ASC 606 includes an accounting policy election that permits entities to account for shipping and handling activities that occur after the customer has obtained control of a good as fulfillment cost rather than as an additional promised service.  We have made this accounting policy election, and will recognize the corresponding transportation expenses for contracts in which we arrange and pay for shipping costs when the customer has obtained control of the related coal.

We generally recognize revenue at a point in time as the customer does not have control over the asset at any point during the fulfillment of the contract.  For the majority of our customers in our Owned and Operated Segment, this is supported by the fact that title and risk of loss transfer to the customer upon loading of the railcar at the mine.  This is also the point at which physical possession of the coal transfers to the customer, as well as the significant risks and rewards in ownership of the coal.  Similarly, for customers in our Logistics and Related Activity Segment, this is supported by the fact that title and risk of loss transfer to the customer when the coal is delivered to an agreed-upon destination or loaded and trimmed on a vessel.  This is also the point at which physical possession of the coal transfers to the customer, as well as the significant risks and rewards in ownership of the coal.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

In our Owned and Operated Segment, we have remaining performance obligations relating to fixed priced contracts of approximately $777 million, which represent the average fixed prices on our committed contracts as of March 31, 2018.  We expect to recognize approximately 80% of this revenue through 2019, with the remainder recognized thereafter.  We have remaining performance obligations relating to index priced contracts or contracts with price reopeners of approximately $280 million, which represent the average re-opener/indexed price on committed contracts as of March 31, 2018.  We expect to recognize approximately 30% of this revenue through 2019, with the remainder recognized thereafter.  In our Logistics and Related Activities segment, we have remaining performance obligations relating to our fixed price contracts of approximately $102 million, which we expect to recognize in 2018.

The tons used to determine the remaining performance obligations are subject to adjustment in instances of force majeure and exercise of customer options to either take additional tons, or reduce tonnage, if such option exists in the customer contract.  Furthermore, export tons are subject to adjustment upon loading of vessels at the port and therefore represent the estimated tons we anticipate shipping.  The elimination of the purchase and sale of coal between reportable segments is not reflected above.

Contract Balances

Under ASC 606, the timing of when a performance obligation is satisfied can affect the presentation of accounts receivable, contract assets, and contract liabilities.  The main distinction between accounts receivable and contract assets is whether consideration is conditional on something other than the passage of time.  A receivable is an entity’s right to consideration that is unconditional.  Under the typical payment terms of our contracts with customers, the customer pays us a base price for the coal, increased or decreased for any quality adjustments.  In our contracts with mine customers, adjustments are known at the time of invoicing as we conduct our own tests of quality.  In contracts with our logistics customers, adjustments are also known at the time of billing as they are based on quality tests performed at the port.  Amounts billed and due are recorded as trade accounts receivable and included in Accounts receivable on our Unaudited Condensed Consolidated Balance Sheets.  In cases where we invoice based on customers’ quality tests, we estimate the transaction price using our quality testing results.  Historically, the difference between customers’ testing results and our testing results have been immaterial.  We do not currently have any contracts in place where we would transfer coal in advance of knowing the final price of the coal sold, and thus do not have any contract assets recorded.  Contract liabilities arise when consideration is received in advance of performance.  This deferred revenue is included in Accrued expenses on our Unaudited Condensed Consolidated Balance Sheets when consideration is received and revenue is not recognized until the performance obligation is satisfied.  We are rarely paid in advance of performance and do not currently have any deferred revenue recorded on our Unaudited Condensed Consolidated Balance Sheets.

Accounts receivable consisted of the following (in thousands):

	March 31,		December 31,
	2018		2017
Trade accounts receivable	$	44,606	$	47,872
Other receivables	419		2,203
Accounts receivable	$	45,025	$	50,075

4.  Segment Information

We have two reportable segments; our Owned and Operated Mines segment and our Logistics and Related Activities segment.

Our Owned and Operated Mines segment is characterized by the predominant focus on thermal coal production where the sale occurs at the mine site and where title and risk of loss generally pass to the customer

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

at that point.  This segment includes our Antelope Mine, Cordero Rojo Mine, and Spring Creek Mine.  Sales in this segment are primarily to domestic electric utilities and some industrials, although a portion may be made to our Logistics and Related Activities segment.  Sales between reportable segments are priced based on prevailing market prices for arm’s length transactions.  Our mines utilize surface mining extraction processes and are all located in the PRB.  The gains and losses resulting from any domestic coal futures contracts and WTI derivative financial instruments are reported within this segment.

Our Logistics and Related Activities segment is characterized by the services we provide to our international and certain of our domestic customers where we deliver coal to the customer at a terminal or the customer’s plant or other delivery point, remote from our mine site.  Services provided include the purchase of coal from third parties or from our Owned and Operated Mines segment, at market prices, as well as the contracting and coordination of the transportation and other handling services from third-party operators, which are typically rail and terminal companies and may include chartering of a vessel.  Title and risk of loss are retained by the Logistics and Related Activities segment through the transportation and delivery process.  Title and risk of loss pass to the customer in accordance with the contract and typically occur at a vessel loading terminal, a vessel unloading terminal or an end use facility.  Risk associated with rail and terminal take-or-pay agreements is also borne by the Logistics and Related Activities segment.  The gains and losses resulting from any international coal forward contracts and international coal put options are reported within this segment.  Amortization related to the amended port and rail take-or-pay agreements are also included in this segment.  See Note 5 for additional information about the amended transportation agreements.  Incremental production taxes and royalties associated with the sales made by our Logistics and Related Activities segment are included in this segment for the current year.  These taxes and royalties were immaterial in the prior year and have not been reclassified from the Owned and Operated Mines segment.

Our business activities that are not considered operating segments are included in Other, although they are not required to be included in this footnote.  They are provided for reconciliation purposes and include Selling, general and administrative expenses (“SG&A”) as well as results relating to broker activity.

Eliminations represent the purchase and sale of coal between reportable segments and the associated elimination of intercompany profit or loss in inventory and are provided for reconciliation purposes.

Revenue

The following table presents Revenue (in thousands):

	Three Months Ended
	March 31,
	2018			2017
Owned and Operated Mines	$	153,653		$	173,611
Logistics and Related Activities	79,636			28,248
Other	3			1,293
Eliminations	(16,983		)	(7,424		)
Consolidated	$	216,309		$	195,728

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Capital Expenditures

The following table presents purchases of property, plant and equipment, investment in development projects, and capital expenditures included in Property, plant and equipment, net, Other assets, and Accounts payable (in thousands):

	Three Months Ended
	March 31,
	2018		2017
Owned and Operated Mines	$	6,182	$	4,596
Logistics and Related Activities	—		—
Other	31		397
Consolidated	$	6,213	$	4,993

Adjusted EBITDA

EBITDA represents net income (loss) before: (1) interest income (expense) net, (2) income tax provision, (3) depreciation and depletion, and (4) amortization.  Adjusted EBITDA represents EBITDA as further adjusted for accretion, which represents non-cash increases in asset retirement obligation liabilities resulting from the passage of time, and specifically identified items that management believes do not directly reflect our core operations.  The specifically identified items that we routinely adjust for are:  (1) adjustments to exclude non-cash impairment charges, (2) adjustments for derivative financial instruments, excluding fair value mark-to-market gains or losses and including cash amounts received or paid, (3) adjustments to exclude debt restructuring costs, and (4) non-cash throughput amortization expense and contract termination payments made to amend the BNSF and Westshore agreements.

Adjusted EBITDA is an additional tool intended to assist our management in comparing our performance on a consistent basis for purposes of business decision making by removing the impact of certain items that management believes do not directly reflect our core operations.  Adjusted EBITDA is a metric intended to assist management in evaluating operating performance, compensation decisions, comparing performance across periods, planning and forecasting future business operations and helping determine levels of operating and capital investments.

The following table reconciles segment Adjusted EBITDA to Income (loss) before income tax provision and earnings from unconsolidated affiliates (in thousands):

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CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

	Three Months Ended
	March 31,
	2018			2017
Adjusted EBITDA
Owned and Operated Mines	$	18,616		$	33,738
Logistics and Related Activities	7,098			(2,564		)
Total Adjusted EBITDA for reportable segments	25,714			31,174
Unallocated net expenses	(6,072		)	(10,744		)
Adjustments to Income (loss) before income tax provision and earnings from unconsolidated affiliates
Depreciation and depletion	(14,996		)	(18,645		)
Accretion	(1,706		)	(1,821		)
Debt restructuring costs	—			(40		)
Derivative financial instruments:
Gain (loss) on derivative financial instruments (1)	—			(2,344		)
Inclusion of cash amounts (received) paid (2)	—			336
Total derivative financial instruments	—			(2,008		)
Interest expense, net	(8,925		)	(12,873		)
(Income) loss from unconsolidated affiliates, net of tax	(272		)	(326		)
Non-cash throughput amortization expense and contract termination payments	(1,690		)	(4,851		)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	$	(7,947	)	$	(20,134	)

(1)(Gain) loss on derivative financial instruments reflected in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

(2)Cash amounts received and paid reflected within operating cash flows in the Unaudited Condensed Consolidated Statements of Cash Flows.

5.  Transportation Agreements

To ensure export terminal and rail capacity for export sales, we enter into multi-year throughput agreements with export terminal companies and railroads.  These types of take-or-pay agreements require us to pay for a minimum quantity of coal to be transported on the railway or through the terminal regardless of whether we sell any coal.  If we fail to make sufficient export sales to meet our minimum obligations under the take-or-pay agreements, we are still obligated to make payments to the export terminal company and railroad.

We have a throughput agreement with Westshore Terminals Limited Partnership (“Westshore”) for our anticipated export sales through their export terminal in Vancouver, British Columbia, and a similar agreement with Burlington Northern Santa Fe Railroad (“BNSF”).

Current Agreements

In December 2016, we terminated our previous agreement with Westshore and entered into a new agreement effective January 1, 2017.  In February 2017, we terminated our previous agreement with BNSF and entered into a new agreement effective April 1, 2017.  These new agreements provided for shipments in 2017 and 2018 and required minimum payments for those two years.  In exchange for the termination of the previous agreements in 2015 and 2016, we made termination payments.  These amounts have been deferred and will be

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CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

amortized, along with the previous amendment payments made in 2015, over the remaining life of the new agreements.

In December 2017 and January 2018, we extended the agreements with Westshore and BNSF, respectively, through the end of 2020 with minimum payment commitments for each year.  We have the right to terminate our commitments for the remaining years at any time in exchange for buyout payments.  Additionally, after the new Westshore agreement terminates and through 2024, if we choose to ship to export customers, we are required to offer to ship through Westshore up to a specified annual tonnage on terms similar to the new agreement before shipping through any other export terminal.  Westshore has the right to accept or reject our offer in its sole discretion.

As of March 31, 2018 and December 31, 2017, there was $20.8 million and $22.4 million, respectively, recorded as a deferred asset for these agreements.  As of March 31, 2018 and December 31, 2017, $15.3 million and $22.4 million, respectively, is included in Other prepaid and deferred charges in the Unaudited Condensed Consolidated Balance Sheets.  $5.5 million is included in noncurrent Other assets in the Unaudited Condensed Consolidated Balance Sheets as of March 31, 2018.  We incurred $52.3 million and $24 million in costs under our logistics agreements with Westshore and BNSF, including amortization of $4.2 million and $10.6 million, during the three months ended March 31, 2018 and 2017, respectively.  These costs are included in Cost of product sold in the Unaudited Condensed Statements of Operations and Comprehensive Income (Loss).

We had outstanding purchase commitments related to transportation agreements consisting of the following (in thousands):

	March 31,		December 31,
	2018		2017
Services
Transportation agreements (1) (2)	$	62,142	$	45,708

(1)Includes undiscounted port take-or-pay commitments as agreed to in the fourth quarter of 2017 for 2018-2020.  We have the right to terminate our commitments at any time in exchange for a buyout payment.  These amounts are considered minimum payments on services.  The per tonne loading charges reflect these advance payments.

(2)Includes undiscounted rail take-or-pay commitments as agreed to in January 2018 for 2018-2020.  We have the right to terminate our commitments at any time in exchange for a buyout payment.  If we do not meet the required portion of our future nominated tons, there would be incremental liquidated damages due under the agreement.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

6.  Interest Expense

Interest expense consisted of the following (in thousands):

	Three Months Ended
	March 31,
	2018		2017
Senior notes	$	6,461	$	7,986
Credit facility unutilized fee	701		1,183
Federal coal lease obligations imputed interest	68		86
Amortization of deferred financing costs and original issue discount	1,919		1,986
Other	39		89
Subtotal	9,188		11,330
Premium on early retirement of debt	—		880
Write-off of deferred financing costs and original issue discount	—		702
Total cost of early retirement of debt and refinancings	—		1,582
Net interest expense	$	9,188	$	12,912

In connection with the public offering discussed in Note 13, upon redemption of the 2019 Notes (defined in Note 13), we paid $1.5 million in accrued and unpaid interest, $0.9 million in premium on the early retirement of debt, and wrote off $0.7 million in deferred financing and original issue discount in the three months ended March 31, 2017.

7.  Income Taxes

TCJA made significant changes to U.S. tax laws.  We have historically been subject to the Alternative Minimum Tax (“AMT”) under which taxes were imposed at a 20% rate on taxable income, subject to certain adjustments, and we assumed that we would be subject to the AMT rate in future periods.  As such, the elimination of the AMT and reduction in the federal corporate tax rate to 21% does not have a material impact on our estimates for cash taxes payable in the next several years.  The corporate rate reduction required a revaluation of our net deferred tax asset at December 31, 2017.  However, since we had a full valuation allowance on our net deferred tax asset, there was no revaluation impact to our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

A material immediate impact of TCJA was the elimination of the AMT and the ability to offset our regular tax liability or claim refunds for taxable years 2018 through 2021 for our AMT credits carried forward from prior periods.  We currently anticipate we will realize approximately $30 million in AMT value over the next four years with approximately half of this value realized in 2019 for taxable year 2018.

As of March 31, 2018 and December 31, 2017, we had deferred tax assets principally arising from: AROs, postretirement benefits, contract rights, and net operating loss carry-forwards.  As management cannot determine that it is more likely than not that we will realize the benefit of the deferred tax assets, a valuation allowance equal to the net deferred tax asset has been established.

Our statutory income tax rate including state income taxes, for the three months ended March 31, 2018 was approximately 23%, while the rate for the three months ended March 31, 2017, was approximately 37%.  Our effective tax rate for the three months ended March 31, 2018 and 2017 was (0.8)% and (1.5)%, respectively.  The difference between the statutory rates for each period is due to TCJA.  In addition, the difference between our

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

statutory income tax rate and our effective income tax rate for the three months ended March 31, 2018 and 2017 is primarily the result of the impact of percentage depletion, income tax in the states in which we do business and changes in our valuation allowance.

As of March 31, 2018 and December 31, 2017, we had no uncertain tax positions that we expect to have a material impact on the financial statements as a result of tax deductions taken during the year or in prior periods or due to settlements with taxing authorities or lapses of applicable statues of limitations.  We are open to federal and state tax audits until the applicable statutes of limitations expire.  The statute of limitations has expired for all federal and state returns filed for periods ending before 2012.

8.  Equity Method Investments

Equity method investments include our 50% equity investment in Venture Fuels Partnership, a coal marketing company.  We have received distributions of $1.0 million and $3.0 million from the Venture Fuels Partnership during the three months ended March 31, 2018 and 2017, respectively.  Our equity method investments are included in noncurrent Other assets on the Unaudited Condensed Consolidated Balance Sheets and had a carrying amount of the following (in thousands):

	March 31,		December 31,
	2018		2017
Venture Fuels Partnership	$	3,041	$	3,774
Other	993		989
Total equity method investments	$	4,034	$	4,763

9.  Earnings (Loss) per Share

Potential dilutive shares of common stock may include restricted stock and units, options, and performance units issued under our Long Term Incentive Plan (“LTIP”).  See Note 16.  We apply the treasury stock method to determine dilution from restricted stock and units, options, and performance units.  On February 28, 2017, we issued 13.5 million shares of common stock through a registered underwritten public offering.

The following table summarizes the calculation of diluted earnings (loss) per share (in thousands, except per share amounts):

	Three Months Ended
	March 31,
	2018			2017
Numerator for calculation of diluted earnings (loss) per share:
Net income (loss)	$	(7,738	)	$	(20,108	)
Denominator for basic income (loss) per share — weighted-average shares outstanding	75,329			66,132
Dilutive effect of stock equivalents	—			—
Denominator for diluted earnings (loss) per share	75,329			66,132
Basic earnings (loss) per share	$	(0.10	)	$	(0.30	)
Diluted earnings (loss) per share	$	(0.10	)	$	(0.30	)

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

For the periods presented, the following items were excluded from the diluted earnings (loss) per share calculation because they were anti-dilutive (in thousands):

	Three Months Ended
	March 31,
	2018	2017
Anti-dilutive stock equivalents	4,227	2,993

10.  Fair Value of Financial Instruments

We use a three-level fair value hierarchy that categorizes assets and liabilities measured at fair value based on the observability of the inputs utilized in the valuation.  The levels of the hierarchy, as defined below, give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.

·Level 1 is defined as observable inputs such as quoted prices in active markets for identical assets.  Our Level 1 assets currently include money market funds.

·Level 2 is defined as observable inputs other than Level 1 prices, including quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.  Our Level 2 assets and liabilities include derivative financial instruments with fair values derived from quoted prices in over-the-counter markets or from prices received from direct broker quotes.  We had no Level 2 assets or liabilities as of March 31, 2018 or December 31, 2017.

·Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.  We had no Level 3 financial instruments as of March 31, 2018 or December 31, 2017.

The tables below set forth, by level, our financial assets and liabilities that are recorded at fair value in the accompanying Unaudited Condensed Consolidated Balance Sheets (in thousands):

	Fair Value as of March 31, 2018
	Level 1		Level 2		Total
Assets
Money market funds (1)	$	64,283	$	—	$	64,283

	Fair Value as of December 31, 2017
	Level 1		Level 2		Total
Assets
Money market funds (1)	$	49,102	$	—	$	49,102

(1)Included in Cash and cash equivalents in the Unaudited Condensed Consolidated Balance Sheets along with $63.5 million and $58.8 million of demand deposits as of March 31, 2018 and December 31, 2017, respectively.

We did not have any transfers between levels during the three months ended March 31, 2018.  Our policy is to value all transfers between levels using the beginning of period valuation.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

11.  Derivative Financial Instruments

WTI Derivatives

Historically, we have used derivative financial instruments, such as swaps, to help manage our exposure to market changes in diesel fuel prices.  The derivatives were indexed to the West Texas Intermediate (“WTI”) crude oil price as quoted on the New York Mercantile Exchange.  As such, the nature of the derivatives did not directly offset market changes to our diesel costs.

Under a swap agreement, if the monthly average index price is higher than the swap price, we receive the difference and if the monthly average index price is lower than the swap price, we pay the difference.  We used swap agreements to fix our forecasted diesel costs for 2017.  All swap agreements were settled as of December 31, 2017.  We currently do not hold any swap agreements.

Derivative Gains and Losses

(Gain) loss on derivative financial instruments recognized in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) were as follows (in thousands):

	Three Months Ended
	March 31,
	2018		2017
WTI derivative financial instruments	$	—	$	2,344
Net derivative financial instruments loss (gain)	$	—	$	2,344

See Note 10 for a discussion related to the fair value of derivative financial instruments.

12.  Inventories, Net

Inventories, net consisted of the following (in thousands):

	March 31,			December 31,
	2018			2017
Materials and supplies	$	69,903		$	68,461
Less: Obsolescence allowance	(1,059		)	(1,094		)
Material and supplies, net	68,844			67,367
Coal inventory	1,503			5,537
Inventories, net	$	70,347		$	72,904

13.  Senior Notes and Equity

On February 28, 2017, we issued 13.5 million shares of common stock through a registered underwritten public offering and received proceeds, net of underwriting discounts and commissions, of $64.7 million.  We used the net proceeds from the offering to fund the full redemption of our outstanding 8.50% Senior Notes due 2019 (“2019 Notes”).  On March 31, 2017, we redeemed the 2019 Notes at a total cost of $64.5 million, reflecting a redemption price of 101.417% of the principal amount of $62.1 million, or $63.0 million, plus accrued and unpaid interest of $1.5 million.  In addition, we wrote off $0.7 million in deferred financing costs and original issue discount as of the redemption date.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Senior notes consisted of the following (in thousands):

	March 31, 2018
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt			Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	350,679	$	12,654	$	(72,967	)	$	290,366	$	307,062
6.375% senior notes due 2024	55,582		826		—			56,408		45,761
Total senior notes	$	406,261	$	13,480	$	(72,967	)	$	346,774	$	352,823

	December 31, 2017
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt			Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	349,719	$	13,614	$	(72,967	)	$	290,366	$	315,773
6.375% senior notes due 2024	55,547		861		—			56,408		45,973
Total senior notes	$	405,266	$	14,475	$	(72,967	)	$	346,774	$	361,746

(1)The fair value of the senior notes was based on observable market inputs, which are considered Level 2 in the fair value hierarchy.  See Note 10 for further information on Level 2 fair value measurements.

14.  Other Obligations

Capital Equipment Lease Obligations

From time to time, we enter into capital leases on equipment under various lease schedules, which are subject to a master lease agreement, and are pre-payable at our option.  Our capital equipment lease obligations are included in Other liabilities.  As of March 31, 2018, future payments for these obligations are as follows (in thousands):

2018	$	1,882
2019	1,698
2020	856
2021	27
2022	—
Thereafter	—
Total	4,463
Less: interest	171
Total principal payments	4,292
Less: current portion	2,195
Capital equipment lease obligations, net of current portion	$	2,097

Federal Coal Lease Obligations

Our federal coal lease obligations, as reflected in the Unaudited Condensed Consolidated Balance Sheets, consist of obligations payable to the Bureau of Land Management of the U.S. Department of the Interior

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for the West Antelope II South lease modification.  The future payments for our federal coal lease obligations are $0.6 million per year through 2022.  The balance of our federal coal lease obligations is $1.8 million as of March 31, 2018.

Accounts Receivable Securitization Program

On January 31, 2017, the Accounts Receivable Securitization Program (“A/R Securitization Program”) was amended to extend the term of the A/R Securitization Program to January 23, 2020, allow for the ability to issue letters of credit, and reduce the maximum borrowing capacity for both cash and letters of credit from $75 million to $70 million.  All other terms of the program remained substantially the same.  The borrowing capacity under the A/R Securitization Program is reduced by the undrawn face amount of letters of credit issued and outstanding.  As of March 31, 2018, we had $19.9 million of borrowing capacity under the A/R Securitization Program, which was less than the undrawn face amount of letters of credit outstanding of $23.0 million.  The $3.1 million difference between the borrowing capacity and the undrawn face amount of the letters of credit was cash-collateralized into a restricted cash account in early April 2018, thus bringing the available borrowing capacity to zero.  As of December 31, 2017, there was a $1.1 million deficit between the borrowing capacity and the undrawn face amount of letters of credit, which was cash-collateralized into a restricted cash account in early January 2018.  The restriction was lifted on the $1.1 million in early March 2018.  There were no borrowings outstanding under the A/R Securitization Program as of March 31, 2018 or December 31, 2017.

Credit Agreement

On February 21, 2014, Cloud Peak Energy Resources LLC entered into a five-year Credit Agreement with PNC Bank, National Association, as administrative agent, and a syndicate of lenders, which was amended on September 5, 2014 and September 9, 2016 (as amended, the “Credit Agreement”).  The Credit Agreement provides us with a senior secured revolving credit facility with a capacity of up to $400 million that can be used to borrow funds or obtain letters of credit.  The borrowing capacity under the Credit Agreement is reduced by the undrawn face amount of letters of credit issued and outstanding, which may be up to $250 million at any time.  As of March 31, 2018 and December 31, 2017, we had no borrowings under the Credit Agreement.  There were no longer any undrawn letters of credit under the Credit Agreement as the balance had been transferred to the A/R Securitization Program as of December 31, 2017.  We were in compliance with the covenants contained in the Credit Agreement as of March 31, 2018 and December 31, 2017.

Liquidity

Our aggregate availability for borrowing under the Credit Agreement and the A/R Securitization Program was approximately $400.0 million as of March 31, 2018.  Our total liquidity, which includes cash and cash equivalents and amounts available under both our Credit Agreement and the A/R Securitization Program, was $527.8 million as of March 31, 2018.

Debt Issuance Costs

There were $3.4 million and $4.4 million of unamortized debt issuance costs as of March 31, 2018 and December 31, 2017, respectively, related to the A/R Securitization Program and the Credit Agreement included in noncurrent Other assets.

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15.  Postretirement Medical Plan

We maintain an unfunded postretirement medical plan to provide certain postretirement medical benefits to eligible employees.  Net periodic postretirement benefit costs included the following components (in thousands):

	Three Months Ended
	March 31,
	2018			2017
Service cost	$	197		$	223
Interest cost	220			230
Amortization of prior service cost (credit)	(1,837		)	(1,821		)
Net periodic benefit cost (credit)	$	(1,420	)	$	(1,368	)

On January 1, 2018, we adopted ASU 2017-07, which requires separate presentation of service costs and all other components of net periodic benefit costs on the income statement.  See Note 2 for further information regarding the impact of this ASU on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

16.  Equity-Based Compensation

Our LTIP permits awards to our employees and eligible non-employee directors, which we generally grant in the first quarter of each year.  The LTIP allows for the issuance of equity-based compensation in the form of restricted stock, restricted stock units, options, stock appreciation rights, dividend equivalent rights, performance awards, and share awards.  As of March 31, 2018, there were no remaining shares available for issuance under the LTIP.  Our stockholders are being asked to approve an additional 3.0 million shares for issuance under the LTIP at our 2018 annual meeting on May 9, 2018.

Generally, each form of equity-based compensation awarded to eligible employees cliff vests on the third anniversary of the grant date, subject to meeting any applicable performance criteria for the award.  However, the awards will pro-rata vest sooner if an employee terminates employment with or stops providing services to us because of death, “disability,” “redundancy” or “retirement” (as such terms are defined in the award agreement or the LTIP, as applicable), or if an employee subject to an employment agreement is terminated by us for any reason other than for “cause” or leaves for “good reason” (as such terms are defined in the relevant employment agreement).  In addition, the awards will fully vest if an employee is terminated without cause (or leaves for good reason, if the employee is subject to an employment agreement) within two years after a “change in control” (as such term is defined in the LTIP) occurs.

The restricted stock units granted to our directors generally vest upon their resignation or retirement (except for a removal for cause) or upon certain events constituting a “change in control” (as such term is defined in the award agreement).  They will pro-rata vest if a director resigns or retires within one year of the date of grant.

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Restricted Stock Units

We have granted restricted stock units under the LTIP to eligible employees and non-employee directors.  A summary of restricted stock unit award activity is as follows (in thousands, except per share amounts):

	Number of Shares		Weighted- Average Grant-Date Fair Value
			(per share)
Non-vested units as of January 1, 2018	2,813		$	3.75
Granted	866		$	3.50
Vested	(324	)	$	7.96
Non-vested units as of March 31, 2018	3,355		$	3.27

As of March 31, 2018, unrecognized compensation cost related to restricted stock awards was $4.8 million, which will be recognized over a weighted-average period of 2.2 years prior to vesting, which is included within Additional paid-in capital in our Unaudited Condensed Consolidated Balance Sheets.  These awards are ultimately delivered in common stock and are classified as equity awards.

Performance Share Units

Performance share units represent the right to receive a number of shares of common stock (or the equivalent cash value thereof) based on the achievement of targeted performance levels related to pre-established total stockholder return goals over a three-year period, and pay out may range from 0% to 200% of the targeted share number.

In most years, including 2018 and 2017, the performance-based units are expected to be settled in shares of common stock and the grant date fair value of the awards is calculated using a Monte Carlo simulation and amortized over the performance period.  The 2016 grants are currently expected to be settled in cash upon any vesting in March 2019, and therefore, are accounted for as a liability award and are included within Accrued expenses in the Unaudited Condensed Consolidated Balance Sheets and marked to market on a quarterly basis.  If we were to have sufficient available shares under our LTIP as approved by our stockholders, the Compensation Committee could elect to settle the 2016 performance-based share units in shares of common stock.

The weighted-average grant date fair values of the performance share units granted during the three months ended March 31, 2018 and the year ended December 31, 2017 were $4.05 and $5.85 per share, respectively.  As of March 31, 2018, $10.1 million of unrecognized compensation cost, which represents the unvested portion of the fair market value of performance share units granted, is expected to be recognized over a weighted-average vesting period of 2.0 years.

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A summary of performance share unit award activity is as follows (in thousands, except per share amounts):

	Number of Shares		Weighted- Average Grant-Date Fair Value
			(per share)
Non-vested units as of January 1, 2018	3,685		$	4.08
Granted	1,153		$	4.05
Vested	(530	)	$	9.66
Non-vested units as of March 31, 2018	4,308		$	3.38

The assumptions used to estimate the fair value of the performance-based share units granted on March 2, 2018 are as follows:

Risk-free interest rate	2.4		%
Expected volatility	62.3		%
Term (in years)	2.8
Fair value (per share)	$	4.05

17.  Commitments and Contingencies

Commitments

Purchase Commitments (1)

We had outstanding purchase commitments consisting of the following (in thousands):

	March 31,		December 31,
	2018		2017
Capital Commitments
Equipment	$	6,818	$	4,191

(1)           See Note 5 for information regarding Transportation Commitments.

Contingencies

Litigation

Administrative Appeals of the BLM’s Approval of the West Antelope II South Lease Modification

Background—On February 1, 2, and 5, 2018, the Powder River Basin Resource Council (“PRBRC”), the Sierra Club, and WildEarth Guardians (“WildEarth”), respectively, filed separate appeals with the Interior Board of Land Appeals (“IBLA”) challenging the Deputy State Wyoming BLM Director’s November 11, 2017 decision, which was publicly noticed on Bureau of Land Management’s (“BLM”) website on January 5, 2018 (“2018 BLM Decision”), to approve Antelope Coal LLC’s (“Antelope Coal”) proposed modification of Antelope Coal’s West Antelope II South (“WAII South”) lease.  Antelope Coal is a 100% owned subsidiary of Cloud Peak Energy.  The 2018 BLM Decision that is the subject of all three appeals approves the proposed amendment of WAII South lease.  This lease modification, which was entered into on February 1, 2018, by BLM and Antelope Coal, adds coal underlying nearly 857 surface acres to Antelope Coal’s existing federal leases.  PRBRC, the Sierra Club, and

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WildEarth have asked the IBLA to vacate the 2018 BLM Decision and direct the BLM to prepare additional environmental analysis on the impacts of the lease modification.

The 2018 BLM Decision was issued after a previous August 15, 2014 decision (“2014 BLM Decision”) had been set aside by the IBLA following previous administrative appeals filed by PRBRC, WildEarth, and the Sierra Club.  On February 7, 2017, the IBLA issued a decision setting aside the 2014 BLM Decision to issue the WAII South lease modification and remanding that decision to BLM on the narrow ground that the Wyoming High Plains District Manager lacked the appropriate delegation of authority to approve such a leasing decision.  The IBLA specifically declined to address the merits of WildEarth’s and PRBRC’s claims challenging whether BLM’s underlying environmental analysis was sufficient to support the agency’s lease modification decision.  On April 10, 2017, BLM filed a petition with the Director of the Department of Interior’s Office of Hearings and Appeals (the “OHA Director”) asking the OHA Director to reverse the IBLA’s February 7, 2017 decision and remand to the IBLA with instructions to decide the merits of the underlying WildEarth and PRBRC appeals.  On September 11, 2017, after full briefing by the parties, the OHA Director denied BLM’s Petition for OHA Director Review thereby concluding the appeals and giving full force and effect to the IBLA’s February 7, 2017 order remanding the matter to BLM and providing BLM with broad discretion on how to proceed.  Upon remand, the BLM reapproved the WAII South lease modification through the 2018 BLM Decision.

Intervention by Cloud Peak Energy and State of Wyoming—On February 16 and March 5, 2018, Antelope Coal and the State of Wyoming, respectively, moved to intervene in the PRBRC, WildEarth, and Sierra Club appeals as respondents to defend the 2018 BLM Decision.  On April 10, 2018, the IBLA granted both motions to intervene.

Current Schedule.  On March 21, 2018, BLM filed a Motion to Dismiss the Sierra Club appeal due to the Sierra Club’s failure to file a Statement of Reasons by the briefing deadline.  On February 27 and March 5, 2018, PRBRC and WildEarth, respectively, each filed a Statement of Reasons in their appeals.  On March 29, March 30, and April 2, 2018, the State of Wyoming, BLM, and Antelope Coal, respectively, filed Answer briefs in the PRBRC appeal.  On April 3, 5, and 9, 2018, the State of Wyoming, BLM, and Antelope Coal, respectively, filed Answer briefs in the WildEarth appeal.  On April 11, 2018, PRBRC filed a reply brief and on April 12, 2018, BLM filed a clarification to PRBRC’s Reply Brief.

We believe the PRBRC, Sierra Club, and WildEarth appeals challenging the BLM’s West Antelope II South lease modification Decision Record are without merit.  Nevertheless, if the appellants’ claims are successful, the timing and ability of Cloud Peak Energy to mine the coal underlying the lease modification surface acres could be materially adversely impacted.  We are unable to estimate a loss or range of loss for this contingency because (1) the challenges do not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the IBLA has broad discretion in determining the nature of the relief ultimately granted.

WildEarth’s Regulatory Challenge to OSM’s Approval Process for Antelope Mine Plan

Background—On September 15, 2015, WildEarth filed a complaint in the Colorado District Court challenging the Department of Interior’s and Office of Surface Mining Reclamation and Enforcement’s (collectively, “OSM”) approvals of mine plans for four different coal mines, one of which is located in Colorado and three of which are located in Wyoming.  The challenged approvals included one mine plan modification that was issued to Antelope Coal for the Antelope Mine in Wyoming.  The plaintiff seeks to vacate existing, required regulatory approvals and to enjoin mining operations at Antelope Mine.

Intervention by Cloud Peak Energy and Others—In November and December of 2015, the State of Wyoming and all the operators of the mines whose mine plans are being challenged—Antelope Coal, New Mexico Coal Resources, LLC, Bowie Resources, LLC, and Thunder Basin Coal, L.L.C., moved to intervene as

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Defendants to defend the challenged mine plans.  On February 18, 2016, the Colorado District Court granted all the parties’ intervention motions.

Current Schedule—On November 25, 2015, the OSM filed a motion to sever WildEarth’s complaint and transfer those claims against the two Wyoming mines (Antelope and Black Thunder) to the District of Wyoming and the New Mexico mine (El Segundo) to the District of New Mexico.  Each of the prospective intervenors filed conditional responses in support of OSM’s transfer motion, and WildEarth filed an opposition to OSM’s transfer motion.  On June 17, 2016, the Colorado District Court granted OSM’s motion to sever and transfer WildEarth’s claims against the Antelope and Black Thunder mine plans to the District of Wyoming and the El Segundo mine plan to the District of New Mexico.  The challenges against the Antelope and Black Thunder mine plans, which are docketed as separate cases, have both been assigned to Judge Johnson of the District of Wyoming.  Because Antelope Coal and Wyoming had each been granted intervention by the Colorado District Court, the Wyoming District Court acknowledged both parties as Intervenor-Defendants after WildEarth’s challenge to the Antelope Mine was transferred to the District of Wyoming.  On October 7, 2016, OSM filed its administrative record for the case challenging the Antelope mine plan.  On October 21, 2016, WildEarth filed a motion to supplement the administrative record with three administrative documents prepared by other federal agencies.  On November 4, 2016, OSM and Antelope Coal each filed opposition briefs.  On December 1, 2016, after full briefing, the court denied WildEarth’s motion to supplement the record.  WildEarth filed its opening merits brief on January 27, 2017.  Opposition briefs by OSM, Antelope Coal, and the State of Wyoming were filed April 5, 2017.  On June 2, 2017, WildEarth filed its reply brief.  On August 22, 2017 and September 20, 2017, WildEarth filed two separate notices of supplemental authority.  OSM and Antelope Coal each filed responses to WildEarth’s first notice on September 6, 2017 and September 21, 2017, respectively.  Antelope Coal and the State of Wyoming filed a joint response to WildEarth’s second notice on October 27, 2017.  The merits briefing has been completed and the parties are awaiting a decision from the court.

We believe WildEarth’s challenge is without merit.  Nevertheless, if WildEarth’s claims against OSM’s approval of the Antelope mine plan modification are successful, any court order granting the requested relief could have a material adverse impact on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any required reductions or modifications to our mining activities.  We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the court has broad discretion in determining the nature of the relief ultimately granted.

WildEarth’s Regulatory Challenge to OSM’s Approval Process for Spring Creek Mine Plan

Background—On June 8, 2017, WildEarth and the Montana Environmental Information Center (“MEIC”) filed a complaint in the Montana District Court challenging OSM’s re-approval of a mine plan modification that was issued to Cloud Peak Energy for the Spring Creek Mine in Montana.  WildEarth and MEIC seek to vacate existing, required regulatory approvals and to enjoin mining operations at the Spring Creek Mine.

Intervention by Spring Creek Coal—On August 31, 2017, Spring Creek Coal LLC moved to intervene in the WildEarth and MEIC’s challenge to the mine plan.  On September 26, 2017, the court granted Spring Creek Coal’s intervention motion.

Current Schedule— OSM answered the plaintiffs’ complaint on August 24, 2017.  OSM lodged the administrative record with the court and served the record on all parties on January 17, 2018.  Plaintiffs filed their motion for summary judgment on April 6, 2018.  Federal Defendants response and cross motion for summary judgment is due May 11, 2018; and Spring Creek’s opposition and cross motion is due May 18, 2018.  Plaintiffs reply brief is due June 12, 2018 and the reply briefs for the Federal Defendants and Spring Creek are due July 2, 2018 and July 11, 2018, respectively.

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We believe WildEarth’s and MEIC’s challenge is without merit.  Nevertheless, if WildEarth’s and MEIC’s claims against OSM’s approval of the Spring Creek mine plan modification are successful, any court order granting the requested relief could have a material adverse impact on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any required reductions or modifications to our mining activities.  We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the court has broad discretion in determining the nature of the relief ultimately granted.

California Climate Change Litigation

Background—On July 17, 2017, three California local governments filed separate but largely identical complaints in California Superior Court, naming numerous fossil fuel companies as defendants (together, the “California Climate Change Litigation”).  The Plaintiffs are the County of San Mateo, the County of Marin, and the City of Imperial Beach.  Defendants include Rio Tinto PLC, Rio Tinto LTD, Rio Tinto Energy America Inc., Rio Tinto Minerals Inc., Rio Tinto Services Inc., Chevron Corp., Chevron U.S.A. Inc., ExxonMobil Corp, BP P.L.C., BP America, Inc., Royal Dutch Shell Company LLC, Citgo Petroleum Corp., ConocoPhillips, ConocoPhillips Company, Phillips 66, Peabody Energy Corp., Total E&P USA Inc., Total Specialties USA Inc., Arch Coal, Inc., ENI S.p.A., ENI Oil & Gas Inc., Statoil ASA, Anadarko Petroleum Corp., Occidental Petroleum Corp., Repsol S.A., Repsol Energy North America Corp., Repsol Trading USA Corp., Marathon Oil Company, Marathon Oil Corporation, Marathon Petroleum Corp., Hess Corp., Devon Energy Corp., Devon Energy Production Company, L.P., Encana Corp., and Apache Corp.  Cloud Peak Energy is not a named defendant.

By way of summary only, Plaintiffs allege that defendants knowingly contributed to GHG emissions through the production and sale of fossil fuels that have adversely impacted the environment, thereby creating financial liabilities for the plaintiffs.  Plaintiffs also allege that defendants engaged in a coordinated effort to conceal and deny their own knowledge of those climate change threats, discredit scientific evidence and create doubt in the minds of customers, consumers, regulators, the media, journalists, teachers and the public about the consequences of the impacts of their fossil fuel pollution.  Based on these allegations, plaintiffs assert that defendants are liable under various causes of action including public nuisance, failure to warn, design defect, private nuisance, negligence, and trespass.  Plaintiffs seek unspecified compensatory damages, equitable relief to abate the alleged nuisances, attorneys’ fees, punitive damages, disgorgement of profits, costs of suit and other relief as the court may deem proper.

Indemnity Sought From Cloud Peak Energy by Rio Tinto—In August 2017, Cloud Peak Energy received a notice from various Rio Tinto entities, including Rio Tinto Energy America Inc., Rio Tinto Minerals Inc., and Rio Tinto Services Inc., seeking indemnification from Cloud Peak Energy for liabilities in connection with the California Climate Change Litigation.  Cloud Peak Energy entered into various agreements with Rio Tinto and its affiliates in connection with the 2009 IPO and separation from Rio Tinto.  Under the Master Separation Agreement, Cloud Peak Energy agreed to indemnify Rio Tinto for certain liabilities relating to Cloud Peak Energy’s business conducted prior to and after the closing of our separation from Rio Tinto, which may potentially include liabilities in connection with the California Climate Change Litigation.

Current Schedule — On July 17, 2017, Plaintiffs filed their lawsuits in the Superior Court of the State of California for the County of San Mateo, the Superior Court of the State of California for the County of Marin, and the Superior Court for the County of Contra Costa, respectively.  On August 24, 2017, the cases were removed to the U.S. District Court for the Northern District of California, where they were deemed related and assigned to Judge Vince Chhabria.  Plaintiffs indicated that they intended to move to remand the cases back to state court, and the parties stipulated that Defendants would not be required to respond to the complaints until the Court ruled on the motion to remand.  The Court signed that Stipulation and Order on September 22, 2017.  On September 25, 2017, Plaintiffs filed their motion to remand.  The Court granted Plaintiffs’ motion to remand on March 16, 2018.  On March 26, 2018, Defendants filed (1) a Notice of Appeal to the U.S. Court of Appeals for the Ninth

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Circuit relating to the District Court’s order granting remand, and (2) a motion to stay the remand order pending appeal.  On April 9, 2018, Judge Chhabria granted Defendants’ motion to stay the remand order pending appeal.  Defendants’ opening brief on appeal is due July 5, 2018;  Plaintiffs’ answering brief is due August 3, 2018; and Defendants’ reply brief is due August 24, 2018.

If the Plaintiffs were to prevail in the California Climate Change Litigation and if we are required to indemnify Rio Tinto for any portion of the resulting liabilities, those amounts could be significant and could have a material adverse impact on our financial condition, results and liquidity.  We are unable to estimate a loss or range of loss for this contingency because of the broad claims and unspecified damages alleged by the plaintiffs against a significant number of defendants and because of the early stage of the California Climate Change Litigation.

Challenge to BLM’s Approval of Revised Resource Management Plans for MT and WY

Background—On March 15, 2016, a group of environmental plaintiffs—Western Organization of Resource Councils, Montana Environmental Information Center, Powder River Basin Resource Council, Northern Plains Resource Council, Sierra Club, and Natural Resources Defense Council—filed a complaint in the U.S. District Court for Montana challenging the BLM’s September 2015 approval of the Miles City, MT and Buffalo, WY, revised Resource Management Plans (“RMPs”).  The Plaintiffs seek to vacate the 2015 RMPs, require BLM to undertake supplemental environmental analysis under the National Environmental Policy Act (“NEPA”), and enjoin BLM and the federal defendants from approving any new leases or project permits for coal or oil and gas resources within the two planning areas until BLM prepares new NEPA analysis and revises its RMPs.

Intervention by Cloud Peak Energy and Others—In February, March, and April, 2017, Cloud Peak Energy, the State of Wyoming, and Peabody Caballo Mining, LLC and BTU Western Resources, Inc. (“Peabody”), respectively, moved to intervene in the case.  The Court granted all the parties intervention motions in March (Cloud Peak) and April (Wyoming and Peabody), 2017.

Current Schedule—On March 26, 2018, the Court issued an Amended Opinion and Order (revising the Court’s March 23, 2018 Order) granting the Plaintiffs’ Cross-Motion for Summary Judgment on three claims and granting Defendants’ and Defendant-Intervenors’ Cross-Motions for Summary Judgment on three claims.  The Court held that BLM must prepare supplemental environmental impact statements for both the Miles City and Buffalo RMPs.  The Court also directed BLM to incorporate the Court’s conclusions in any pending or future coal or oil and gas leases or permits in the Miles City and Buffalo planning areas until BLM completes the supplemental NEPA analysis for both RMPs.  The Court further ordered the parties to meet and confer in good faith in an attempt to reach an agreement regarding the appropriate remedy.  If the parties are unable to reach an agreement, the parties must submit separate briefs to the Court by May 26, 2018 recommending appropriate remedies in light of the Court’s March 26th Order.  The Court will not enter final judgment in the case until after it reviews the parties’ briefs and issues a remedy order.

We believe the Plaintiffs’ challenge is without merit.  Nevertheless, if Plaintiffs are successful in obtaining their requested remedies, the timing and ability of Cloud Peak Energy to obtain leases and permit approvals could be materially adversely impacted.  We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is broad and the only relief the Court has ordered to date would require BLM to prospectively address alleged deficiencies in complying with applicable legal and regulatory requirements, and (3) it is not clear at this point whether the Court will issue any injunctive relief that might adversely affect Cloud Peak Energy’s leases and permit approvals.

Other Legal Proceedings

We are involved in other legal proceedings arising in the ordinary course of business and may become involved in additional proceedings from time to time.  We believe that there are no other legal proceedings pending that are likely to have a material adverse effect on our consolidated financial condition, results of

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operations or cash flows.  Nevertheless, we cannot predict the impact of future developments affecting our claims and lawsuits, and any resolution of a claim or lawsuit or an accrual within a particular fiscal period may materially and adversely impact our results of operations for that period.  In addition to claims and lawsuits against us, our leases by application, leases by modification, permits, and other industry regulatory processes and approvals, including those applicable to the utility and coal logistics and transportation industries, may also continue to be subject to legal challenges that could materially and adversely impact our mining operations, results and liquidity.  These regulatory challenges may seek to vacate prior regulatory decisions and authorizations that are legally required for some or all of our current or planned mining activities.  If we are required to reduce or modify our mining activities as a result of these challenges, the impact could have a material adverse effect on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any such required reductions or modifications to our mining activities.

Tax Contingencies

Our income tax calculations are based on application of the respective U.S. federal or state tax laws.  Our tax filings, however, are subject to audit by the respective tax authorities.  Accordingly, we recognize tax benefits when it is more likely than not a position will be upheld by the tax authorities.  To the extent the final tax liabilities are different from the amounts originally accrued, the increases or decreases are recorded as income tax expense.

Several non-income based production tax audits related to federal and state royalties and severance taxes are currently in progress.  The financial statements reflect our best estimate of taxes and related interest and penalties due for potential adjustments that may result from the resolution of such tax audits.  From time to time, we receive audit assessments and engage in settlement discussions with applicable tax authorities, which may result in adjustments to our estimates of taxes and related interest and penalties.

Concentrations of Risk and Major Customers

For the three months ended March 31, 2018, there was no single customer that represented 10% or more of consolidated revenue.  For the three months ended March 31, 2017, there was one customer that represented 10% or more of consolidated revenue.  We generally do not require collateral or other security on accounts receivable because our customers are comprised primarily of investment grade electric utilities.  Credit risk is controlled through credit approvals and monitoring procedures.

Guarantees and Off-Balance Sheet Risk

In the normal course of business, we are party to guarantees and financial instruments with off-balance sheet risk, such as bank letters of credit, performance or surety bonds and indemnities, which are not reflected on the Unaudited Condensed Consolidated Balance Sheets.  In our past experience, virtually no claims have been made against these financial instruments.  Management does not expect any material losses to result from these guarantees or off-balance sheet instruments.

U.S. federal and state laws require we secure certain of our obligations to reclaim lands used for mining and to secure coal lease obligations.  The primary method we have used to meet these reclamation obligations and to secure coal lease obligations is to provide a third-party surety bond, typically through an insurance company.  Specific bond amounts may change over time, depending on the activity at the respective site and any specific requirements by federal or state laws.  We also previously used self-bonding to secure performance of certain obligations in Wyoming.  In January 2017, we received approval to remove the final $10 million of self-bonding that existed as of December 31, 2016 and exited self-bonding during the first quarter of 2017.  As of March 31, 2018, we had $413.6 million of reclamation and lease bonds backed by collateral of $23.0 million in the form of letters of credit under our A/R Securitization Program used for mining, securing coal lease obligations, and

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for other operating requirements.  As of March 31, 2018, we have reduced the undrawn face amount of all letters of credit by a total of $44.5 million from March 31, 2017.

18.  Accumulated Other Comprehensive Income (Loss)

The changes in Accumulated other comprehensive income (loss) (“AOCI”) related to our postretirement medical plan by component, net of tax are as follows (in thousands):

	Three Months Ended
	March 31,
	2018			2017
Beginning balance, January 1,	$	13,807		$	21,884
Other comprehensive income (loss) before reclassifications	(422		)	—
Amounts reclassified from accumulated other comprehensive income (loss)	(1,415		)	(1,821		)
Net current period other comprehensive income (loss)	(1,837		)	(1,821		)
Ending balance, March 31,	$	11,969		$	20,063

The reclassifications out of AOCI are as follows (in thousands):

	Three Months Ended
	March 31,
	2018			2017
Postretirement Medical Plan (1)
Amortization of prior service costs (credits), before tax(2)	$	(1,837	)	$	(1,821	)
Tax expense (benefit)	422			—
Amounts reclassified from AOCI	$	(1,415	)	$	(1,821	)

(1)See Note 15 for the components of our net periodic postretirement benefit costs.

(2)Presented on the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).  The balances disclosed for the three months ended March 31, 2017 were previously included in Cost of product sold and Selling, general, and administrative expenses, respectively.  See Note 2 for information regarding ASU 2017-07, which we adopted on January 1, 2018.

19.  Supplemental Cash Flow Information

Restricted Cash

The following table provides a reconciliation of Cash and cash equivalents and restricted cash reported in the Unaudited Condensed Consolidated Balance Sheets as of March 31, 2018 and 2017, that sum to the total of such amounts in the Unaudited Condensed Consolidated Statements of Cash Flows:

	March 31,
	2018		2017
Cash and cash equivalents	$	127,796	$	100,515
Restricted cash in other current assets	725		725
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$	128,521	$	101,240

30

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Other Cash Flow Information

	Three Months Ended
	March 31,
	2018			2017
Supplemental cash flow disclosures:
Interest paid	$	2,835		$	4,893
Income taxes paid (refunded)	$	(24	)	$	(257	)
Supplemental non-cash investing and financing activities:
Capital expenditures included in accounts payable	$	851		$	869
Assets acquired under federal coal lease	$	2,356		$	—

20.  Supplemental Guarantor/Non-Guarantor Financial Information

In accordance with the indentures governing the senior notes outstanding as of March 31, 2018, CPE Inc. and certain of our 100% owned U.S. subsidiaries (the “Guarantor Subsidiaries”) have fully and unconditionally guaranteed the senior notes on a joint and several basis.  These guarantees of either series of senior notes are subject to release in the following customary circumstances:

·a sale or other disposition (including by way of consolidation or merger or otherwise) of the Guarantor Subsidiary or the sale or other disposition of all or substantially all the assets of the Guarantor Subsidiary (other than to CPE Inc. or a Restricted Subsidiary (as defined in the applicable indenture) of CPE Inc.) otherwise not in violation of  the applicable indenture;

·a disposition of the majority of the capital stock of a Guarantor Subsidiary to a third person otherwise not in violation of the applicable indenture, after which the applicable Guarantor Subsidiary is no longer a Restricted Subsidiary;

·upon a liquidation or dissolution of a Guarantor Subsidiary so long as no default under the applicable indenture occurs as a result thereof;

·the designation in accordance with the applicable indenture of the Guarantor Subsidiary as an Unrestricted Subsidiary or the Guarantor Subsidiary otherwise ceases to be a Restricted Subsidiary of CPE Inc. in accordance with the applicable indenture;

·defeasance or discharge of such series of senior notes;

·the release, other than the discharge through payment by the Guarantor Subsidiary, of all other guarantees by such Restricted Subsidiary of Debt (as defined in the applicable indenture) of either issuer of the senior notes or the debt of another Guarantor Subsidiary under the Credit Agreement; or

·in the case of the indenture for the 12% Second Lien Senior Notes due 2021, as set forth in the First Lien/Second Lien Intercreditor Agreement, dated October 17, 2016, among Cloud Peak Energy Resources LLC, Cloud Peak Energy Finance Corp., PNC Bank, National Association, as Senior Representative for the First Lien Credit Agreement Secured Parties and Wilmington Trust, National Association, as the Second Priority Representative for the Second Lien Indenture Secured Parties.

31

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following historical financial statement information is provided for CPE Inc. and the Guarantor/Non-Guarantor Subsidiaries:

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)

(in thousands)

	Three Months Ended March 31, 2018
	Parent Guarantor (CPE Inc.)			Issuing Company (CPE Resources)			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	1,789		$	—		$	216,309		$	—		$	(1,789	)	$	216,309
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	—			4			192,529			1			—			192,534
Depreciation and depletion	—			270			14,726			—			—			14,996
Accretion	—			—			1,706			—			—			1,706
Selling, general and administrative expenses	—			9,107			—			—			(1,789		)	7,318
Other operating costs	—			—			126			—			—			126
Total costs and expenses	—			9,381			209,087			1			(1,789		)	216,680
Operating income (loss)	1,789			(9,381		)	7,222			(1		)	—			(371		)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	—			268			1,349			—			—			1,617
Interest income	2			261			—			—			—			263
Interest expense	—			(8,862		)	(108		)	(218		)	—			(9,188		)
Other, net	—			(147		)	(268		)	147			—			(268		)
Total other income (expense)	2			(8,480		)	973			(71		)	—			(7,576		)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	1,791			(17,861		)	8,195			(72		)	—			(7,947		)
Income tax benefit (expense)	(63		)	—			—			—			—			(63		)
Income (loss) from unconsolidated affiliates, net of tax	—			6			266			—			—			272
Income (loss) from consolidated affiliates, net of tax	(9,467		)	8,389			(72		)	—			1,150			—
Net income (loss)	(7,738		)	(9,467		)	8,389			(72		)	1,150			(7,738		)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service cost	(1,837		)	(1,837		)	(1,837		)	—			3,674			(1,837		)
Income tax on postretirement medical plan and pension changes	—			—			—			—			—			—
Other comprehensive income (loss)	(1,837		)	(1,837		)	(1,837		)	—			3,674			(1,837		)
Total comprehensive income (loss)	$	(9,575	)	$	(11,304	)	$	6,552		$	(72	)	$	4,824		$	(9,575	)

32

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)

(in thousands)

	Three Months Ended March 31, 2017
	Parent Guarantor (CPE Inc.)			Issuing Company (CPE Resources)			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations			Consolidated
Revenue	$	1,806		$	—		$	195,728		$	—		$	(1,806	)	$	195,728
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	—			—			170,269			—			—			170,269
Depreciation and depletion	—			193			18,452			—			—			18,645
Accretion	—			—			1,821			—			—			1,821
(Gain) loss on derivative financial instruments	—			—			2,344			—			—			2,344
Selling, general and administrative expenses	—			12,782			—			—			(1,806		)	10,976
Debt restructuring costs	—			40			—			—			—			40
Other operating costs	—			—			176			—			—			176
Total costs and expenses	—			13,015			193,062			—			(1,806		)	204,271
Operating income (loss)	1,806			(13,015		)	2,666			—			—			(8,543		)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	—			262			1,330			—			—			1,592
Interest income	1			38			—			—			—			39
Interest expense	(41		)	(12,548		)	(134		)	(189		)	—			(12,912		)
Other, net	—			(60		)	(310		)	60			—			(310		)
Total other income (expense)	(40		)	(12,308		)	886			(129		)	—			(11,591		)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	1,766			(25,323		)	3,552			(129		)	—			(20,134		)
Income tax benefit (expense)	(300		)	—			—			—			—			(300		)
Income (loss) from unconsolidated affiliates, net of tax	—			2			324			—			—			326
Income (loss) from consolidated affiliates, net of tax	(21,574		)	3,745			(129		)	—			17,958			—
Net income (loss)	(20,108		)	(21,576		)	3,747			(129		)	17,958			(20,108		)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service cost	(1,821		)	(1,821		)	(1,821		)	—			3,642			(1,821		)
Income tax on postretirement medical plan and pension changes	—			—			—			—			—			—
Other comprehensive income (loss)	(1,821		)	(1,821		)	(1,821		)	—			3,642			(1,821		)
Total comprehensive income (loss)	$	(21,929	)	$	(23,397	)	$	1,926		$	(129	)	$	21,600		$	(21,929	)

33

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Supplemental Condensed Consolidating Balance Sheet

(in thousands)

	March 31, 2018
	Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
ASSETS
Current assets
Cash and cash equivalents	$	—	$	127,684	$	112	$	—	$	—		$	127,796
Accounts receivable	—		—		20,541		24,484		—			45,025
Due from related parties	—		69,760		2,065		—		(71,825		)	—
Inventories, net	—		—		70,347		—		—			70,347
Income tax receivable	232		—		—		—		—			232
Other prepaid and deferred charges	85		—		23,684		—		—			23,769
Other assets	—		—		802		—		—			802
Total current assets	317		197,444		117,551		24,484		(71,825		)	267,971
Noncurrent assets
Property, plant and equipment, net	—		3,240		1,351,759		—		—			1,354,999
Goodwill	—		—		2,280		—		—			2,280
Income tax receivable	29,454		—		—		—		—			29,454
Other assets	1,032,742		1,248,668		37,710		299		(2,284,988		)	34,431
Total assets	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813	)	$	1,689,135
LIABILITIES AND MEMBER’S EQUITY
Current liabilities
Accounts payable	$	2	$	25	$	25,503	$	60	$	—		$	25,590
Royalties and production taxes	—		—		54,775		—		—			54,775
Accrued expenses	8,812		10,301		18,806		—		—			37,919
Due to related parties	54,866		71		—		16,959		(71,825		)	71
Current portion of federal coal lease obligations	—		—		379		—		—			379
Other liabilities	—		—		2,195		—		—			2,195
Total current liabilities	63,680		10,397		101,658		17,019		(71,825		)	120,929
Noncurrent liabilities
Senior notes	—		406,261		—		—		—			406,261
Federal coal lease obligations, net of current portion	—		—		1,404		—		—			1,404
Asset retirement obligations, net of current portion	—		—		100,817		—		—			100,817
Accumulated postretirement medical benefit obligation, net of current portion	—		—		25,303		—		—			25,303
Royalties and production taxes	—		—		28,592		—		—			28,592
Other liabilities	—		—		6,996		—		—			6,996
Total liabilities	63,680		416,658		264,770		17,019		(71,825		)	690,302
Commitments and Contingencies (Note 17)
Total equity	998,833		1,032,694		1,244,530		7,764		(2,284,988		)	998,833
Total liabilities and equity	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813	)	$	1,689,135

34

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Supplemental Condensed Consolidating Balance Sheet

(in thousands)

	December 31, 2017
	Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non- Guarantor Subsidiaries		Eliminations			Consolidated
ASSETS
Current assets
Cash and cash equivalents	$	—	$	107,818	$	130	$	—	$	—		$	107,948
Accounts receivable	—		—		17,359		32,716		—			50,075
Due from related parties	—		46,350		23,044		—		(69,272		)	122
Inventories, net	—		—		72,904		—		—			72,904
Income tax receivable	256		—		—		—		—			256
Other prepaid and deferred charges	283		—		36,681		—		—			36,964
Other assets	—		—		1,765		—		—			1,765
Total current assets	539		154,168		151,883		32,716		(69,272		)	270,034
Noncurrent assets
Property, plant and equipment, net	—		3,480		1,362,275		—		—			1,365,755
Goodwill	—		—		2,280		—		—			2,280
Income tax receivable	29,454		—		—		—		—			29,454
Other assets	1,036,162		1,289,487		33,612		341		(2,328,424		)	31,178
Total assets	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696	)	$	1,698,701
LIABILITIES AND MEMBER’S EQUITY
Current liabilities
Accounts payable	$	1	$	24	$	29,748	$	59	$	—		$	29,832
Royalties and production taxes	—		—		54,327		—		—			54,327
Accrued expenses	3,160		5,659		23,999		—		—			32,818
Due to related parties	44,039		71		—		25,162		(69,272		)	—
Other liabilities	—		—		2,435		—		—			2,435
Total current liabilities	47,200		5,754		110,509		25,221		(69,272		)	119,412
Noncurrent liabilities
Senior notes	—		405,266		—		—		—			405,266
Asset retirement obligations, net of current portion	—		—		99,297		—		—			99,297
Accumulated postretirement medical benefit obligation, net of current portion	—		—		24,958		—		—			24,958
Royalties and production taxes	—		—		21,896		—		—			21,896
Other liabilities	11,146		—		8,917		—		—			20,063
Total liabilities	58,346		411,020		265,577		25,221		(69,272		)	690,892
Commitments and Contingencies (Note 17)
Total equity	1,007,809		1,036,115		1,284,473		7,836		(2,328,424		)	1,007,809
Total liabilities and equity	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696	)	$	1,698,701

35

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Supplemental Condensed Consolidating Statement of Cash Flows

(in thousands)

	Three Months Ended March 31, 2018
	Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)			Guarantor Subsidiaries			Non- Guarantor Subsidiaries		Eliminations		Consolidated
Net cash provided by (used in) operating activities	$	—	$	19,898		$	4,178		$	—	$	—	$	24,076
Investing activities
Purchases of property, plant and equipment	—		(31		)	(2,615		)	—		—		(2,646		)
Investment in development projects	—		—			(360		)	—		—		(360		)
Net cash provided by (used in) investing activities	—		(31		)	(2,975		)	—		—		(3,006		)
Financing activities
Principal payments of federal coal leases	—		—			(574		)	—		—		(574		)
Other	—		—			(648		)	—		—		(648		)
Net cash provided by (used in) financing activities	—		—			(1,222		)	—		—		(1,222		)
Net increase (decrease) in cash, cash equivalents, and restricted cash	—		19,867			(19		)	—		—		19,848
Cash, cash equivalents, and restricted cash at beginning of period	—		107,818			856			—		—		108,673
Cash, cash equivalents, and restricted cash at the end of period	$	—	$	127,684		$	836		$	—	$	—	$	128,521

36

CLOUD PEAK ENERGY INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Supplemental Condensed Consolidating Statement of Cash Flows

(in thousands)

	Three Months Ended March 31, 2017
	Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)			Guarantor Subsidiaries			Non- Guarantor Subsidiaries			Eliminations		Consolidated
Net cash provided by (used in) operating activities	$	—	$	14,437		$	4,856		$	402		$	—	$	19,695
Investing activities
Purchases of property, plant and equipment	—		(386		)	(3,738		)	—			—		(4,124		)
Net cash provided by (used in) investing activities	—		(386		)	(3,738		)	—			—		(4,124		)
Financing activities
Repayment of senior notes	—		(62,094		)	—			—			—		(62,094		)
Payment of debt refinancing costs	—		—			—			(402		)	—		(402		)
Payment of debt restructuring costs	—		(40		)	—			—			—		(40		)
Proceeds from issuance of common stock	—		68,850			—			—			—		68,850
Cash paid for equity offering	—		(4,434		)	—			—			—		(4,434		)
Other	—		—			(644		)	—			—		(644		)
Net cash provided by (used in) financing activities	—		2,282			(644		)	(402		)	—		1,236
Net increase (decrease) in cash, cash equivalents, and restricted cash	—		16,333			474			—			—		16,807
Cash, cash equivalents, and restricted cash at beginning of period	—		83,673			760			—			—		84,433
Cash, cash equivalents, and restricted cash at the end of period	$	—	$	100,006		$	1,234		$	—		$	—	$	101,240

37

CAUTIONARY NOTICE REGARDING FORWARD-LOOKING STATEMENTS

This report contains forward-looking statements that involve substantial risks and uncertainties.  You can identify these statements by forward-looking words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “plan,” “potential,” “should,” “will,” “would,” or similar words.  You should read statements that contain these words carefully because they discuss our current plans, strategies, prospects, and expectations concerning our business, operating results, financial condition, and other similar matters.  While we believe that these forward-looking statements are reasonable as and when made, there may be events in the future that we are not able to predict accurately or control, and there can be no assurance that future developments affecting our business will be those that we anticipate.  Additionally, all statements concerning our expectations regarding future operating results are based on current forecasts for our existing operations and do not include the potential impact of any future acquisitions, divestitures, or other transactions.  The factors listed under “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017 (our “2017 Form 10-K”) and Item 1A of Part II of this report, as well as any cautionary language in this report, describe the known material risks, uncertainties, and events that may cause our actual results to differ materially and adversely from the expectations we describe in our forward-looking statements.  Additional factors or events that may emerge from time to time, or those that we currently deem to be immaterial, could cause our actual results to differ, and it is not possible for us to predict all of them.  You are cautioned not to place undue reliance on the forward-looking statements contained herein.  We undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.  The following factors are among those that may cause actual results to differ materially and adversely from our forward-looking statements:

·the timing and extent of any sustained recovery of the currently depressed thermal coal industry and the impact of ongoing or further depressed industry conditions on our financial performance, liquidity, and financial covenant compliance;

·the prices we receive for our coal and logistics services, our ability to effectively execute our forward sales strategy, and changes in utility purchasing patterns resulting in decreased long-term purchases of coal;

·the timing of reductions or increases in customer coal inventories;

·our ability to obtain new coal sales agreements on favorable terms, to resolve customer requests for reductions or deferrals, and to respond to any cancellations of their committed volumes on terms that preserve the amount and timing of our forecasted economic value;

·the impact of increasingly variable and less predictable demand for thermal coal based on natural gas prices, summer cooling demand, winter heating demand, economic growth rates, and other factors that impact overall demand for electricity;

·our ability to efficiently and safely conduct our mining operations and to adjust our planned production levels to respond to market conditions and effectively manage the costs of our operations;

·competition with other producers of coal and with traders and re-sellers of coal, including the current oversupply of thermal coal, the impacts of currency exchange rate fluctuations and the strong U.S. dollar, and government environmental, energy, and tax policies and regulations that make foreign coal producers more competitive for international transactions;

·the impact of coal industry bankruptcies on our competitive position relative to other companies who have emerged from bankruptcy with reduced leverage and potentially reduced operating costs;

·competition with natural gas, wind, solar, and other non-coal energy resources, which may continue to increase as a result of low domestic natural gas prices, the declining cost of renewables, and due to environmental, energy, and tax policies, regulations, subsidies, and other government actions that encourage or mandate use of alternative energy sources;

38

·coal-fired power plant capacity and utilization, including the impact of climate change and other environmental regulations and initiatives, energy policies, political pressures, non-governmental organization activities, international treaties or agreements, and other factors that may cause domestic and international electric utilities to continue to phase out or close existing coal-fired power plants, reduce or eliminate construction of any new coal-fired power plants, or reduce consumption of coal from the Powder River Basin (“PRB”);

·the failure of economic, commercially available carbon capture technology to be developed and adopted by utilities in a timely manner;

·the impact of “keep coal in the ground” campaigns and other well-funded, anti-coal initiatives by environmental activist groups and others targeting substantially all aspects of our industry;

·our ability to offset declining U.S. demand for coal and achieve longer term growth in our business through our logistics revenue and export sales, including the significant impact of Chinese and Indian thermal coal import demand and production levels from other countries and basins on overall seaborne coal prices;

·railroad, export terminal and other transportation performance, costs, and availability, including the availability of sufficient and reliable rail capacity to transport PRB coal, any development of future export terminal capacity and our ability to access capacity on commercially reasonable terms;

·the impact of our rail and terminal take-or-pay commitments if we do not meet our required export shipment obligations;

·weather conditions and weather-related damage that impact our mining operations, our customers, or transportation infrastructure;

·operational, geological, equipment, permit, labor, and other risks inherent in surface coal mining;

·future development or operating costs for our development projects exceeding our expectations or other factors adversely impacting our development projects;

·our ability to successfully acquire coal and appropriate land access rights at economic prices and in a timely manner and our ability to effectively resolve issues with conflicting mineral development that may impact our mine plans;

·the impact of asset impairment charges, if required, as a result of challenging industry conditions or other factors, including any impairments associated with our development projects;

·our plans and objectives for future operations and the development of additional coal reserves, including risks associated with acquisitions;

·the impact of current and future environmental, health, safety, endangered species, and other laws, regulations, treaties, executive orders, court decisions or governmental policies, or changes in interpretations thereof and third-party regulatory challenges, including additional requirements, uncertainties, costs, liabilities, or restrictions adversely affecting the use, demand or price for coal, our mining operations or the logistics, transportation, or terminal industries;

·the impact of required regulatory processes and approvals to lease coal and obtain, maintain, and renew permits for coal mining operations or to transport coal to domestic and foreign customers, including third-party legal challenges to regulatory approvals that are required for some or all of our current or planned mining activities;

39

·any increases in rates or changes in regulatory interpretations or assessment methodologies with respect to royalties or severance and production taxes and the potential impact of associated interest and penalties;

·inaccurately estimating the costs or timing of our reclamation and mine closure obligations and our assumptions underlying reclamation and mine closure obligations;

·our ability to obtain required surety bonds and provide any associated collateral on commercially reasonable terms;

·the availability of, disruptions in delivery or increases in pricing from third-party vendors of raw materials, capital equipment and consumables which are necessary for our operations, such as explosives, petroleum-based fuel, tires, steel, and rubber;

·our assumptions concerning coal reserve estimates;

·our relationships with, and other conditions affecting, our customers (including our largest customers who account for a significant portion of our total revenue) and other counterparties, including economic conditions and the credit performance and credit risks associated with our customers and other counterparties, such as traders, brokers, and lenders under our Credit Agreement (as defined below) and financial institutions with whom we maintain accounts or enter hedging arrangements;

·the results of our hedging programs and changes in the fair value of derivative financial instruments that are not accounted for as hedges;

·the terms and restrictions of our indebtedness;

·liquidity constraints, access to capital and credit markets and availability and costs of credit, surety bonds, letters of credit, and insurance, including risks resulting from the cost or unavailability of financing due to debt and equity capital and credit market conditions for the coal sector or in general, changes in our credit rating, our compliance with the covenants in our debt agreements, the credit pressures on our industry due to depressed conditions, or any demands for increased collateral by our surety bond providers;

·volatility in the price of our common stock, including the impact of any delisting of our stock from the New York Stock Exchange if we fail to meet the minimum average closing price listing standard;

·our liquidity, results of operations, and financial condition generally, including amounts of working capital that are available;

·volatility in our results due to required quarterly mark-to-market accounting adjustments associated with certain historical equity compensation awards;

·litigation and other contingencies;

·the authority of federal and state regulatory authorities to order any of our mines to be temporarily or permanently closed under certain circumstances; and

·other risk factors or cautionary language described from time to time in the reports and registration statements we file with the Securities and Exchange Commission, including those in Item 1A - Risk Factors in our 2017 Form 10-K and any updates thereto in our Forms 10-Q and Forms 8-K, including Item 1A of Part II of this report.

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

Explanatory Note

This Item 2 may contain forward-looking statements that involve substantial risks and uncertainties.  When considering these forward-looking statements, you should keep in mind the cautionary statements in this report and our other Securities and Exchange Commission (“SEC”) filings, including the Risk Factors in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”) and Item 1A of Part II of this report.  See also “Cautionary Notice Regarding Forward-Looking Statements” in Item 1 above.

This Item 2 is intended to help the reader understand our results of operations and financial condition.  This discussion should be read in conjunction with our Unaudited Condensed Consolidated Financial Statements in Item 1 of this report and our other SEC filings, including our Audited Consolidated Financial Statements in Item 8 of our 2017 Form 10-K.

Overview

We are one of the largest producers of coal in the United States of America (“U.S.”) and the Powder River Basin (“PRB”), based on our 2017 coal sales.  We operate some of the safest mines in the coal industry.  According to the most current Mine Safety and Health Administration (“MSHA”) data, we have one of the lowest employee all injury incident rates among the largest U.S. coal producing companies.  We currently operate solely in the PRB, the lowest cost region of the major coal producing regions in the U.S., where we own and operate three surface coal mines: the Antelope Mine, the Cordero Rojo Mine, and the Spring Creek Mine.

Our Antelope Mine and Cordero Rojo Mine are located in Wyoming and our Spring Creek Mine is located in Montana.  Our mines produce subbituminous thermal coal with low sulfur content, and we sell our coal primarily to domestic and foreign electric utilities.  Thermal coal is primarily consumed by electric utilities and industrial consumers as fuel for electricity generation.  In 2017, the coal we produced generated approximately 2% of the electricity produced in the U.S.  As of December 31, 2017, we controlled approximately 1.0 billion tons of proven and probable reserves.  We do not produce any metallurgical coal.

In addition, we have two development projects, both located in the Northern PRB.  For purposes of this report, the term “Northern PRB” refers to the area within the PRB that lies within Montana and the northern part of Sheridan County, Wyoming.  The Youngs Creek project is an undeveloped surface mine project located in Wyoming, seven miles south of our Spring Creek Mine and contiguous with the Wyoming-Montana state line.  The Big Metal project is located near the Youngs Creek project on the Crow Indian Reservation in southeast Montana.

Our logistics business provides a variety of services designed to facilitate the sale and delivery of coal.  These services include the purchase of coal from third parties or from our owned and operated mines, coordination of the transportation and delivery of purchased coal, negotiation of take-or-pay rail agreements and take-or-pay port agreements and demurrage settlement with vessel operators.  For a discussion of our rail and port agreements, see Note 5 of Notes to Unaudited Condensed Consolidated Financial Statements in Item 1.

Segment Information

Our reportable segments include Owned and Operated Mines and Logistics and Related Activities.  For a discussion of these segments, see Note 4 of our Unaudited Condensed Consolidated Financial Statements in Item 1.

Core Business Operations

Our key business drivers include the following:

·the volume of coal sold by our Owned and Operated Mines segment;

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·the price for which we sell our coal;

·the costs of mining, including labor, repairs and maintenance, fuel, explosives, depreciation of capital equipment, and depletion of coal leases;

·the amount of royalties, severance taxes, and other governmental levies that we pay;

·capital expenditures to acquire property, plant and equipment;

·the volume of deliveries coordinated by our Logistics and Related Activities segment to customer contracted destinations;

·the revenue we receive for our logistics services; and

·the costs for logistics services, rail and port charges for coal sales made on a delivered basis, including demurrage and any take-or-pay charges.

The volume of coal that we sell in any given year is driven by global and domestic demand for coal-generated electric power.  Demand for coal-generated electric power may be affected by many factors including weather patterns, natural gas prices, railroad performance, the availability of coal-fired and alternative generating capacity and utilization, the closure of coal-fired power plants, environmental and legal challenges, political and regulatory factors, energy policies, international and domestic economic conditions, currency exchange rate fluctuations, and other factors discussed in this Item 2 and in our 2017 Form 10-K.

The price at which we sell our coal is a function of the demand for coal relative to the supply.  We typically seek to enter into multi-year contracts with our customers, which helps mitigate the risks associated with any short-term imbalance in supply and demand.  We have historically entered each year with expected production effectively fully sold.  This strategy helped us run our mines at predictable production rates, which improves control of operating costs.  In recent years, our business has become more variable and less predictable because utilities are adjusting their purchasing pattern based on natural gas prices, weather, and other factors and have also been increasingly purchasing coal for shorter terms.  As of April 18, 2018, we have sold approximately 47 million tons of our estimated 52 to 56 million tons of production for 2018.

As is common in the PRB, coal seams at our existing mines naturally deepen, resulting in additional overburden to be removed at additional cost.  We have experienced increased operating costs for longer haul distances, maintenance and supplies, and employee wages and salaries.  Historically, we have used derivative financial instruments to help manage our exposure to diesel fuel prices.  We entered into West Texas Intermediate (“WTI”) derivative financial instruments to hedge our diesel fuel costs in 2017.  While currently we have no WTI derivative financial instruments in place, we expect to monitor the derivatives market and may use such derivatives in the future.

We incur significant capital expenditures to maintain, update, and expand our mining equipment, surface land holdings, and coal reserves.  As the costs of acquiring federal coal leases and associated surface rights increase, our depletion costs also increase.

The volume of coal sold on a delivered basis is influenced by international and domestic market conditions.  Coal sold on a delivered basis to customer contracted destinations, including sales to Asian customers, involves us arranging and paying for logistics services, which can include rail, rail car hire, vessel chartering, and port charges, including any demurrage incurred and other costs.  These logistics costs are affected by volume, various scheduling considerations, and negotiated rates for rail and port services.  We have exposure to take-or-pay commitments for our rail and port committed capacities.  For a discussion of our rail and port agreements, see Note 5 of Notes to Unaudited Condensed Consolidated Financial Statements in Item 1.

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Current Considerations

Owned and Operated Mines Segment

Mine shipments to domestic customers of 10.8 million tons for the three months ended March 31, 2018 declined from 12.5 million tons shipped to domestic customers in the three months ended December 31, 2017 as customers focused on reducing their coal inventories.  We have worked with our customers to move a higher proportion of 2018 contracted volumes to the first half of the year.  This has resulted in a wider open position in the second half of the year that we expect to fill through new sales as the year progresses.

Natural gas prices remained above $3.00 per MMBtu for most of the first quarter but have since declined to around $2.75 per MMBtu for May delivery.  Despite a significant decline in storage volumes, natural gas prices declined as a result of increased production and stabilized demand.  As of April 6, 2018, U.S. Energy Information Administration data showed that natural gas inventories have declined by about 35.2%, compared to year ago levels.

Energy Ventures Analysis estimates there were 66 million tons of PRB coal inventories on utility stockpiles at the end of March 2018, a decline of 9 million tons from December 2017 levels.  We believe customer inventories will increase slightly over the next few months, and once the summer cooling season begins, further coal purchases will occur.

Historically, our core cash mining costs, excluding royalties, production taxes, and fuel, have increased as a result of increasing strip ratios and haul distances.  Strip ratios increase as coal seams naturally deepen and require additional overburden removal, which is common in the PRB.  Haul distances increase as mining pits progress further from the load-out.  For 2018, our mine plans indicate that the strip ratio will increase more than recent years resulting in higher costs.  We expect lower volumes from the Cordero Rojo mine in 2018, partially offset by increased volumes at Spring Creek due to higher export demand.  These anticipated higher costs and lower volumes will reduce the contribution from the Owned and Operated Mines segment in 2018.

Logistics and Related Activities Segment

The international thermal Newcastle coal price index has recently declined from the over $100 per tonne, currently settling around $90 per tonne as the end of winter reduced near-term demand.  Based on estimates through February 2018, thermal imports into China have increased 11 million tonnes, or almost 40%, to start the year.  Cold weather led to China’s electricity generation increasing by 10% in the first quarter, following a full year 2017 increase of nearly 7%.  Coal-fired generation increased 8.7% during the first quarter of 2018, fueling strong import demand.  In South Korea, thermal imports declined by 1 million tonnes or 5% through February 2018.  Estimates for 2018 have total imports into South Korea increasing by 5 million tonnes on increasing utilization of existing plants along with new plants coming on line.

We exported 1.4 million tons during the three months ended March 31, 2018.  Good performance by the mine, rail, and port have allowed us to hit our targeted volumes for the quarter.  Although pricing has recently declined as winter ended, it is expected to recover as summer electricity demand increases.  Pricing and demand remain favorable for our coal and we expect export shipments of 5.5 million tons in 2018.  We have sold 3.3 million tons for delivery in 2018.  The higher expected export volumes and pricing are anticipated to partially offset the lower expected contribution from the Owned and Operated Mines segment.

Potential for Asset Impairments

Lower domestic coal prices and lower production volumes, such as those experienced recently, may not only decrease our revenues and cash flows but also may reduce the amount of coal we can produce economically.  Lower coal prices may result in asset impairment charges on our long-lived assets, including development projects, due to reductions in the future cash flows associated with our Owned and Operated Mines.  If prices and demand should decline, or remain at current levels for an extended period of time, or not improve as expected, we may incur impairment charges with respect to certain of our long-lived assets.  Additional triggering events could include, but are not limited to, an impairment of coal reserves caused

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by continued declines in coal prices, increasing costs of production or regulatory changes that adversely impact coal-fired electricity generation.  See Item 1A in our 2017 Form 10-K - “Risk Factors—Risks Related to Our Business and Industry—We may not recover our investments in our mining, exploration, port access rights, development projects, and other assets, which may require us to recognize impairment charges related to those assets.”

Environmental and Other Regulatory Matters

Federal, state, and local authorities regulate the U.S. coal mining industry with respect to various matters, including air quality standards, water pollution, plant and wildlife protection, the discharge of materials into the environment and the effects of mining on surface and groundwater quality and availability.  These laws and regulations have had, and will continue to have, a significant adverse effect on our production costs and our competitive position relative to certain other sources of electricity generation.  Future laws, regulations or orders, including those relating to global climate change, may cause coal to become a less attractive fuel source, thereby reducing coal’s share of the market for fuels and other energy sources used to generate electricity.  See “Climate Change Regulatory Environment” below and Part I—Item I. Business “Environmental and Other Regulatory Matters” in our 2017 Form 10-K for additional climate disclosures.

Three Months Ended March 31, 2018 Compared to Three Months Ended March 31, 2017

Summary

The following table summarizes key results (in millions, except per share amounts and percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount			Percent
Total tons sold	12.3			14.1			(1.8		)	(12.8	)
Total revenue	$	216.3		$	195.7		$	20.6		10.5
Net income (loss)	$	(7.7	)	$	(20.1	)	$	12.4		61.7
Diluted EPS	$	(0.10	)	$	(0.30	)	$	0.20		66.7
Adjusted EBITDA (1)	$	19.6		$	20.4		$	(0.8	)	(3.9	)

(1)EBITDA and Adjusted EBITDA are intended to provide additional information only and do not have any standard meaning prescribed by U.S. GAAP.  A quantitative reconciliation of Net income (loss) to Adjusted EBITDA is found in “Non-GAAP Financial Measures” below.

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Results of Operations

Revenue

The following table presents Revenue and tons sold (in millions, except per ton amounts and percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount			Percent
Owned and Operated Mines
Realized price per ton sold	$	12.20		$	12.10		$	0.10		0.8
Tons sold	12.3			14.0			(1.7		)	(12.1	)
Coal revenue	$	149.5		$	169.7		$	(20.2	)	(11.9	)
Other revenue	$	4.1		$	3.9		$	0.2		5.1
Logistics and Related Activities
Total tons sold	1.4			0.6			0.8			133.3
Realized price per ton sold - Asian export	$	57.13		$	49.53		$	7.60		15.3
Tons sold - Asian export	1.4			0.5			0.9			180.0
Realized price per ton sold - Domestic	$	35.61		$	46.42		$	(10.81	)	(23.3	)
Tons sold - Domestic (1)	—			0.1			(0.1		)	(100.0	)
Revenue	$	79.6		$	28.2		$	51.4		182.3
Other
Revenue	$	—		$	1.3		$	(1.3	)	(100.0	)
Eliminations of Intersegment Sales
Revenue	$	(16.9	)	$	(7.4	)	$	(9.5	)	(128.4	)
Total Consolidated
Revenue	$	216.3		$	195.7		$	20.6		10.5

(1)For the three months ended March 31, 2018, the domestic logistics volumes were 43,800 tons.

Owned and Operated Mines Segment

The following table shows volume and price related changes to coal revenue for the three months ended March 31, 2018 compared to the three months ended March 31, 2017 (in millions):

Three months ended March 31, 2017	$	169.7
Changes associated with volumes	(21.4		)
Changes associated with prices	1.2
Three months ended March 31, 2018	$	149.5

Coal revenue decreased for the three months ended March 31, 2018 compared to the same period in 2017 primarily due to fewer tons sold.  Although customers took their contracted coal, volumes decreased despite a more normal winter as utilities drew down their stockpiles rather than make new purchases.  Realized prices for the three months ended March 31, 2018 increased slightly as compared to the same period in 2017 due to customer mix.  Other revenue increased for the three months ended March 31, 2018 compared to the same period in 2017 primarily due to additional business interruption insurance proceeds of $0.3 million from a claim filed in 2016 related to lost tonnage due to a customer force majeure.

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Logistics and Related Activities Segment

Revenue increased for the three months ended March 31, 2018 compared to the same period in 2017 due an increase the export market.  We shipped 11 vessels during the three months ended March 31, 2018 compared to five vessels during the three months ended March 31, 2017.

Other

Revenue decreased for the three months ended March 31, 2018 compared to the same period in 2017 primarily due to no brokered sales for the three months ended March 31, 2018 compared to $1.2 million for the same period in 2017.

Cost of Product Sold

The following table presents Cost of product sold (in millions, except per ton amounts and percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount			Percent
Owned and Operated Mines
Average cost per ton sold	$	10.94		$	9.87		$	1.07		10.8
Cost of product sold (produced coal)	$	134.1		$	138.5		$	(4.4	)	(3.2	)
Other cost of product sold	$	1.9		$	1.9		$	—		—
Logistics and Related Activities
Average cost per ton sold - Asian export	$	52.09		$	55.67		$	(3.58	)	(6.4	)
Average cost per ton sold - Domestic	$	30.82		$	42.43		$	(11.61	)	(27.4	)
Cost of product sold	$	74.2		$	35.7		$	38.5		107.8
Other
Cost of product sold	$	—		$	1.2		$	(1.2	)	(100.0	)
Eliminations of Intersegment Sales
Cost of product sold	$	(17.7	)	$	(7.0	)	$	(10.7	)	(152.9	)
Total Consolidated
Cost of product sold	$	192.5		$	170.3		$	22.2		13.0

Owned and Operated Mines Segment

Cost of product sold decreased in the three months ended March 31, 2018 as compared to the same period in 2017 primarily due to the decrease in tons sold, which decreased production taxes and royalties.  Partially offsetting this decrease was an increase in fuel and lubes, due to an increase in the price of diesel.  The average cost per ton sold increased primarily due to lower production.  Cost of product sold and average cost per ton sold have been revised for the three months ended March 31, 2017 from prior period presentation to reflect the adoption of Accounting Standards Update (“ASU”) 2017-07.  The adoption, which required certain postretirement benefit costs to be relocated out of Operating income (loss), increased Cost of product sold and average cost per ton sold by $1.3 million and $0.09, respectively, from what was previously reported for the three months ended March 31, 2017.  See Note 2 for further information regarding the impact of this ASU on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

Logistics and Related Activities Segment

Cost of product sold increased in the three months ended March 31, 2018 as compared to the same period in 2017 due to the increase in export sales.  We shipped 11 vessels during the three months ended March 31, 2018 compared to five vessels in the three months ended March 31, 2017.

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Other

Cost of product sold decreased in the three months ended March 31, 2018 due to a decrease in our broker activity as compared to the same period in 2017.

Operating Income (Loss)

The following table presents Operating income (loss) (in millions, except for percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount			Percent
Owned and Operated Mines
Operating income (loss)	$	1.2		$	10.6		$	(9.4	)	(88.7	)
Logistics and Related Activities
Operating income (loss)	5.4			(7.4		)	12.8			173.0
Other
Operating income (loss)	(7.7		)	(11.3		)	3.6			31.9
Eliminations of Intersegment Sales
Operating income (loss)	0.7			(0.4		)	1.1				*
Total Consolidated
Operating income (loss)	$	(0.4	)	$	(8.5	)	$	8.1		95.3

*Not meaningful

Owned and Operated Mines Segment

Operating income decreased in the three months ended March 31, 2018 as compared to the same period in 2017 primarily due to the decrease in Revenue as previously discussed.  Partially offsetting this was the decrease in Cost of product sold as previously discussed.  In addition, Depreciation and depletion decreased $3.7 million primarily due to of the decrease in production.  Finally, we recognized mark-to-market losses on our WTI derivative financial instruments of $2.3 million in the three months ended March 31, 2017.  We had no derivative financial instruments in 2018.  Operating income (loss) has been revised for the three months ended March 31, 2017 from prior period presentation to reflect the adoption of ASU 2017-07.  The adoption, which required certain postretirement benefit costs to be relocated out of Operating income (loss), decreased operating income by $1.3 million from what was previously reported for the three months ended March 31, 2017.  See Note 2 for further information regarding the impact of this ASU on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

Logistics and Related Activities Segment

There were no factors other than those previously discussed for Revenue and Cost of product sold that influenced the increase in operating income in the three months ended March 31, 2018 as compared to the same period in 2017.

Other

Operating loss decreased during the three months ended March 31, 2018 as compared to the same period in 2017.  In addition to the factors previously discussed for Revenue and Cost of product sold, Selling, general and administrative expenses (“SG&A”) decreased $3.7 million primarily due to lower stock based compensation costs.

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Other Income (Expense)

The following table presents Other income (expense) (in millions, except for percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount		Percent
Other income (expense)	$	(7.6	)	$	(11.6	)	$	4.0	34.5

Other expense decreased for the three months ended March 31, 2018 as compared to the same period in 2017 primarily due to a decrease in interest expense of $1.5 million related to the early retirement of the 2019 Notes, and the reduction in principal on our 6.375% Senior Notes due 2024 (the “2024 Notes”).  In addition, in 2017, $0.7 million of debt issuance costs were written off and $0.9 million was incurred in the early retirement of the 2019 Notes.  Other income (expense) has been revised for the three months ended March 31, 2017 from prior period presentation to reflect the adoption of ASU 2017-07.  The adoption, which required certain postretirement benefit costs to be relocated out of Operating income (loss), decreased Other expense by $1.6 million from what was previously reported for the three months ended March 31, 2017.  See Note 2 for further information regarding the impact of this ASU on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

Income Tax Provision

As of March 31, 2018 and December 31, 2017, we had deferred tax assets principally arising from: AROs, alternative minimum tax credits, postretirement benefits, contract rights, and net operating loss carry-forwards.  As management cannot determine that it is more likely than not that we will realize the benefit of the deferred tax assets, a valuation allowance equal to the net deferred tax asset has been established.

Our statutory income tax rate including state income taxes, for the three months ended March 31, 2018 was approximately 23%, while the rate for the three months ended March 31, 2017 was approximately 37%.  Our effective tax rate for the three months ended March 31, 2018 and 2017 was (0.8)% and (1.5)%, respectively.  The difference between the statutory rates for each period is due to the Tax Cuts and Jobs Act (“TCJA”) (see Liquidity below).  In addition, the difference between our statutory income tax rate and our effective income tax rate for the three months ended March 31, 2018 and 2017 is primarily the result of the impact of percentage depletion, income tax in the states in which we do business and changes in our valuation allowance.

Liquidity and Capital Resources

	March 31,		December 31,
	2018		2017
	(in millions)
Cash and cash equivalents	$	127.8	$	107.9

In addition to our cash and cash equivalents, our primary sources of liquidity are cash from our operations and borrowing capacity under our Credit Agreement and A/R Securitization Program.  We also have a capital leasing program that could grow over time from its March 31, 2018 balance of $4.3 million for some of our capital equipment purchases subject to the conditions in the master lease agreement.  These programs provide flexibility and liquidity to our capital structure.  Additionally, we also periodically access debt and equity markets.

Cash balances depend on a number of factors, such as the volume of coal sold by our Owned and Operated Mines segment; the price for which we sell our coal; the costs of mining, including labor, repairs and maintenance, fuel, and explosives; the amount of royalties, severance taxes, and other governmental levies that we pay; capital expenditures to acquire property, plant and equipment; the volume of deliveries coordinated by our Logistics and Related Activities segment to customer contracted destinations; the revenue we receive for our logistics services; demurrage and any take-or-pay charges; coal-fired electricity demand, regulatory changes and energy policies impacting our business; and other risks and uncertainties, including those discussed in Item 1A in

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our 2017 Form 10-K and in Item 1A of Part II of this report.  Industry conditions have resulted in increased credit pressures on the coal industry.  Any credit demands by third parties or refusals by banks, surety bond providers, investors or others to extend, renew, or refinance credit on commercially reasonable terms may adversely impact our business, financial condition, results of operations, cash flows, and liquidity.

Capital expenditures are necessary to keep our equipment fleets updated to maintain our mining productivity and competitive position and to add new equipment as necessary.  Capital expenditures for the three months ended March 31, 2018 and 2017 were $2.6 million and $4.1 million, respectively.  Our anticipated capital expenditures are expected to be between $15 million and $25 million in 2018, which we plan to fund through cash from operations.

Overview of Cash Transactions

We started 2018 with cash, cash equivalents, and restricted cash of $108.7 million and concluded the three months ended March 31, 2018 with $128.5 million.  The primary reasons for the increase were cash provided by operating activities of $24.1 million partially offset by capital expenditures of $2.6 million.  The following table represents cash flows (in millions, except percentages):

	Three Months Ended
	March 31,						Change
	2018			2017			Amount			Percent
Beginning balance - cash, cash equivalents, and restricted cash	$	108.7		$	84.4
Net cash provided by (used in) operating activities	24.1			19.7			$	4.4		22.3
Net cash provided by (used in) investing activities	(3.0		)	(4.1		)	$	1.1		26.8
Net cash provided by (used in) financing activities	(1.2		)	1.2			$	(2.4	)	(200.0	)
Ending balance - cash, cash equivalents, and restricted cash	$	128.5		$	101.2

Net cash provided by operating activities increased for the three months ended March 31, 2018 as compared to the same period in 2017 primarily due to an increase in working capital of $8.9 million partially offset by a decrease in Net income (loss) adjusted for non-cash items of $4.5 million.

The decrease in cash used in investing activities for the three months ended March 31, 2018 as compared to the same period in 2017 was primarily related to a decrease in capital expenditures of $1.5 million.

Cash provided by (used in) financing activities decreased for the three months ended March 31, 2018 as compared to the same period in 2017 primarily due to making our first payment of $0.6 million related to the West Antelope II South lease modification as we received approval during the year.  During 2017, we had cash proceeds of $68.9 million from the issuance of 13.5 million shares of common stock partially offset by underwriting discounts and commissions related to the equity offering of $4.4 million and the redemption of our outstanding 2019 Notes of $62.1 million.

First Quarter 2017 Equity Offering and 2019 Notes Redemption

On February 28, 2017, we issued 13.5 million shares of common stock through a registered underwritten public offering and received proceeds, net of underwriting discounts and commissions, of $64.7 million.  We used the net proceeds from the offering to fund the full redemption of our remaining outstanding 2019 Notes.  On March 31, 2017, we redeemed the 2019 Notes at a total cost of $64.5 million, reflecting a redemption price of 101.417% of the principal amount of $62.1 million, or $63.0 million, plus accrued and unpaid interest of $1.5 million.  In addition, we wrote off $0.7 million in deferred financing costs and original issue discount as of the redemption date.  The primary purpose of the redemption of the 2019 Notes was to reduce outstanding long-term debt and extend our nearest term maturity date to 2021.  The 2019 Notes bore interest at fixed annual rates of 8.50%.

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Credit Agreement

On February 21, 2014, Cloud Peak Energy Resources LLC entered into a five-year Credit Agreement with PNC Bank, National Association, as administrative agent, and a syndicate of lenders, which was amended on September 5, 2014 and September 9, 2016 (as amended, the “Credit Agreement”).  The Credit Agreement provides us with a senior secured revolving credit facility with a capacity of up to $400 million that can be used to borrow funds or obtain letters of credit.  The borrowing capacity under the Credit Agreement is reduced by the undrawn face amount of letters of credit issued and outstanding, which may be up to $250 million at any time.  As of March 31, 2018 and December 31, 2017, we had no borrowings under the Credit Agreement.  There were no longer any undrawn letters of credit under the Credit Agreement as the balance had been transferred to the A/R Securitization Program as of December 31, 2017.  We were in compliance with the covenants contained in the Credit Agreement as of March 31, 2018 and December 31, 2017.

We intend to extend or replace the Credit Agreement before its maturity in February 2019 and currently expect that any replacement facility will be significantly smaller than our current Credit Agreement.  See Item 1A in our 2017 Form 10-K - “Risk Factors—Risks Related to Our Indebtedness and Liquidity—Our Credit Agreement provides an important source of our overall liquidity.  We will need to extend or replace the Credit agreement before its maturity in February 2019.  If we are unable to successfully extend or replace the Credit Agreement in a timely manner, our future financial condition and liquidity may be materially adversely affected.”

A/R Securitization Program

On January 31, 2017, the A/R Securitization Program was amended to extend the term of the A/R Securitization Program to January 23, 2020, allow for the ability to issue letters of credit, and revise the maximum combined borrowing capacity for both cash and letters of credit to $70 million.  All other terms of the program remained substantially the same.  The borrowing capacity under the A/R Securitization Program is reduced by the undrawn face amount of letters of credit issued and outstanding.  As of March 31, 2018, we had $19.9 million of borrowing capacity under the A/R Securitization Program, which was less than the undrawn face amount of letters of credit outstanding of $23.0 million.  The $3.1 million difference between the borrowing capacity and the undrawn face amount of the letters of credit was cash-collateralized into a restricted cash account in early April 2018, thus bringing the available borrowing capacity to zero.  As of December 31, 2017, there was a $1.1 million deficit between the borrowing capacity and the undrawn face amount of letters of credit, which was cash-collateralized into a restricted cash account in early January 2018.  The restriction was lifted on the $1.1 million in early March 2018.  There were no borrowings outstanding under the A/R Securitization Program as of March 31, 2018 or December 31, 2017.

Liquidity

Our aggregate availability for borrowing under the Credit Agreement and the A/R Securitization Program was approximately $400.0 million as of March 31, 2018.  Our total liquidity, which includes cash and cash equivalents and amounts available under both our Credit Agreement and the A/R Securitization Program, was $527.8 million as of March 31, 2018.

As of March 31, 2018, we have reduced the undrawn face amount of all letters of credit by a total of $44.5 million from March 31, 2017, due to a decrease in the collateral required for bonding.

The TCJA legislation, enacted in December 2017, made significant changes to U.S. tax laws, including (i) the reduction in the federal corporate tax rate, (ii) the elimination of the corporate alternative minimum tax (“AMT”) and the ability to offset regular tax liability or claim refunds for AMT credits carried forward, and (iii) imposing limitations on the deductibility of interest expense.  We have historically been subject to the AMT, under which taxes were imposed at a 20% rate on taxable income, subject to certain adjustments, and we assumed that we would be subject to the AMT in future periods.  As such, the elimination of the AMT and reduction in the federal corporate tax rate to 21% does not have a material impact on our estimates for cash taxes payable in the next several years.

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The material immediate impact of the TCJA to us was the elimination of the AMT and the ability to offset our regular tax liability or claim refunds for taxable years 2018 through 2021 for AMT credits carried forward from prior periods.  We currently anticipate we will realize approximately $30 million in AMT value over the next four years with approximately half of this value realized in 2019 for taxable year 2018.

We believe our sources of liquidity will be sufficient to fund our primary ordinary course uses of cash for the next twelve months, which include our costs of coal production and logistics services, capital expenditures, and interest on our debt.  In addition, we believe our sources of liquidity will be sufficient to fund the expected cash settlement of our 2016 performance share units upon any vesting in March 2019.

If we do not have sufficient resources from ongoing operations to satisfy our obligations or the timing of payments on our obligations does not coincide with cash inflows from operations, we may need to use our cash on hand or borrow under our Credit Agreement or our A/R Securitization Program.  If the obligation is in excess of these amounts, we may need to seek additional borrowing sources or take other actions.  Depending upon existing circumstances at the time, we may not be able to obtain additional funding on acceptable terms or at all.  In addition, our existing debt instruments contain restrictive covenants, which may prohibit us from borrowing under our Credit Agreement or pursuing certain alternatives to obtain additional funding.

We regularly monitor the capital and bank credit markets for opportunities that we believe will improve our balance sheet and may engage, from time to time, in financing or refinancing transactions as market conditions permit.  Future activities may include, but are not limited to, public or private debt or equity offerings, the purchase of our outstanding debt for cash in open market purchases or privately negotiated refinancing, and extension and exchange transactions or public or private exchange offers or tender offers.  Any financing or refinancing transaction may occur on a stand-alone basis or in connection with, or immediately following, other transactions.  Our ability to access the debt or equity capital markets on economic terms in the future will be affected by general economic conditions, the domestic and global financial markets, our operational and financial performance, the value and performance of our debt or equity securities, prevailing commodity prices, and other macroeconomic factors outside of our control.

Off-Balance Sheet Arrangements

In the normal course of business, we are party to guarantees and financial instruments with off-balance sheet risk such as bank letters of credit, performance or surety bonds and indemnities, which are not reflected on the Unaudited Condensed Consolidated Balance Sheets.  These instruments are used to secure certain of our obligations to reclaim lands used for mining, securing coal lease obligations, and for other operating requirements.

As of March 31, 2018, we had $413.6 million of reclamation and lease bonds with underwriters backed by collateral of approximately 6%, or $23.0 million, in the form of letters of credit under our A/R Securitization Program.  This represents a decrease in letters of credit of $44.5 million from March 31, 2017, due to negotiations with our surety underwriters to decrease the collateral required for bonding.  The terms and conditions with the issuers of the surety bonds allow for collateral calls to mitigate their exposure.  The amount of collateral that could be required under these collateral calls would be based on the underlying bonded assets and their risks, our credit profile, and overall market conditions.  Should further collateral for these obligations be called, this could utilize a significant portion of our existing liquidity or potentially exceed our existing liquidity.  In January 2017, we received approval to remove the final $10 million of self-bonding that existed as of December 31, 2016 and exited self-bonding during the first quarter of 2017.

Climate Change Regulatory Environment

Enactment of current, proposed, or future laws or regulations regarding emissions from the combustion of coal by the U.S. or some of its states or by other countries, or other actions to limit such emissions, like the creation of mandatory use requirements for renewable fuel sources, will likely result in electricity generators further switching from coal to other fuel sources.  Public concern and the political environment may also continue to materially and adversely impact future coal demand and usage to generate electricity, regardless of applicable legal and regulatory requirements.  Additionally, the creation and issuance of subsidies designed to encourage

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use of alternative energy sources could further decrease the demand for coal as an energy source.  The potential financial impact on us as a result of these factors will depend upon the degree to which electricity generators diminish their reliance on coal as a fuel source as a result thereof.  That, in turn, will depend on a number of factors, including the appeal and design of the subsidies being offered, the specific requirements imposed by any such laws or regulations such as mandating use by utilities of renewable fuel sources, the time periods over which those laws or regulations would be phased in and the state of any commercial development and deployment of carbon capture technologies, including storage, conversion, or other commercial use for captured carbon.  In view of the significant uncertainty surrounding each of these factors, it is not possible for us to reasonably predict the impact that any such laws or regulations may have on our results of operations, financial condition, or cash flows, however, such impacts may be significant.  See Item 1 “Business—Environmental and Other Regulatory Matters—Global Climate Change” and Item 1A “Risk Factors” of our 2017 Form 10-K for additional discussion regarding how climate change and other environmental regulatory matters may materially adversely impact our business.

Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect reported amounts.  These estimates and assumptions are based on information available as of the date of the financial statements.  Accounting measurements at interim dates inherently involve greater reliance on estimates than at year-end.  The results of operations for the three months ended March 31, 2018 are not necessarily indicative of results that can be expected for future quarters or the full year.  Refer to the section entitled “Critical Accounting Policies and Estimates” of “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 2017 Form 10-K for a discussion of our critical accounting policies and estimates.

Newly Adopted Accounting Standards and Recently Issued Accounting Pronouncements

See Note 2 of our Unaudited Condensed Consolidated Financial Statements in Item 1 for a discussion of newly adopted accounting standards and recently issued accounting pronouncements.

Non-GAAP Financial Measures

EBITDA and Adjusted EBITDA are intended to provide additional information only and do not have any standard meaning prescribed by U.S. GAAP.  A quantitative reconciliation of historical Net income (loss) to Adjusted EBITDA is found in the tables below.

EBITDA represents Net income (loss) before: (1) interest income (expense), net, (2) income tax provision, (3) depreciation and depletion, and (4) amortization.  Adjusted EBITDA represents EBITDA as further adjusted for accretion, which represents non-cash increases in asset retirement obligation liabilities resulting from the passage of time, and specifically identified items that management believes do not directly reflect our core operations.  The specifically identified items that we routinely adjust for are:  (1) adjustments to exclude non-cash impairment charges, (2) adjustments for derivative financial instruments, excluding fair value mark-to-market gains or losses and including cash amounts received or paid, (3) adjustments to exclude debt restructuring costs, and (4) non-cash throughput amortization expense and contract termination payments made to amend the BNSF and Westshore agreements.  We have entered into certain derivative financial instruments such as put options that require the payment of premiums at contract inception.  The reduction in the premium value over time is reflected in the mark-to-market gains or losses.  Our calculation of Adjusted EBITDA does not include premiums paid for derivative financial instruments; either at contract inception, as these payments pertain to future settlement periods, or in the period of contract settlement, as the payment occurred in a preceding period.  The non-cash portion of amortization arising from payments made in prior years, as well as the amortization of contract termination payments, is adjusted out of Adjusted EBITDA because the ongoing cash payments are significantly smaller than the overall amortization of these payments and do not reflect the transactional results.

Because not all companies use identical calculations, our presentation of Adjusted EBITDA may not be comparable to other similarly titled measures of other companies.  Our management recognizes that using Adjusted EBITDA as a performance measure has inherent limitations as compared to net income (loss) or other

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U.S. GAAP financial measures, as this non-GAAP measure excludes certain items, including items that are recurring in nature, which may be meaningful to investors.  As a result of the exclusions, Adjusted EBITDA should not be considered in isolation and does not purport to be an alternative to net income (loss) or other U.S. GAAP financial measures as a measure of our operating performance.  See Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Non-GAAP Financial Measures” of our 2017 Form 10-K for additional information regarding Adjusted EBITDA and its limitations compared to U.S. GAAP financial measures.

The following tables present a reconciliation of consolidated Net income (loss) to consolidated Adjusted EBITDA,  consolidated Net income (loss) to consolidated Operating income (loss), and segment Operating income (loss) to segment Adjusted EBITDA (in millions):

Adjusted EBITDA

	Three Months Ended
	March 31,
	2018			2017
Net income (loss)	$	(7.7	)	$	(20.1	)
Interest income	(0.3		)	—
Interest expense	9.2			12.9
Income tax (benefit) expense	0.1			0.3
Depreciation and depletion	15.0			18.6
EBITDA	16.2			11.7
Accretion	1.7			1.8
Derivative financial instruments:
Exclusion of fair value mark-to-market losses (gains) (1)	—			2.3
Inclusion of cash amounts received (paid) (2)	—			(0.3		)
Total derivative financial instruments	—			2.0
Non-cash throughput amortization expense and contract termination payments	1.7			4.9
Adjusted EBITDA	$	19.6		$	20.4

(1)Fair value mark-to-market (gains) losses reflected on the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

(2)Cash amounts received and paid reflected within operating cash flows in the Unaudited Condensed Consolidated Statements of Cash Flows.

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Adjusted EBITDA by Segment

	Three Months Ended
	March 31,
	2018			2017
Net income (loss)	$	(7.7	)	$	(20.1	)
Interest income	(0.3		)	—
Interest expense	9.2			12.9
Other, net	0.3			0.3
Income tax expense (benefit)	0.1			0.3
Loss (income) from unconsolidated affiliates, net of tax	(0.3		)	(0.3		)
Net periodic postretirement benefit cost (income), excluding service cost	(1.6		)	(1.6		)
Consolidated operating income (loss)	$	(0.4	)	$	(8.5	)
Owned and Operated Mines
Operating income (loss)	$	1.2		$	10.6
Depreciation and depletion	14.7			18.5
Accretion	1.6			1.7
Derivative financial instruments:
Exclusion of fair value mark-to-market losses (gains)	—			2.3
Inclusion of cash amounts received (paid)	—			(0.3		)
Total derivative financial instruments	—			2.0
Net periodic postretirement benefit income (cost), excluding service cost	1.3			1.3
Other	(0.2		)	(0.4		)
Adjusted EBITDA	$	18.6		$	33.7
Logistics and Related Activities
Operating income (loss)	$	5.4		$	(7.4	)
Non-cash throughput amortization expense and contract termination payments	1.7			4.9
Other	—			(0.1		)
Adjusted EBITDA	$	7.1		$	(2.6	)
Other Unallocated Operating Income (Loss)
Other operating income (loss)	$	(7.7	)	$	(11.3	)
Elimination of intersegment operating income (loss)	$	0.7		$	(0.4	)

Item 3.  Quantitative and Qualitative Disclosures About Market Risk.

We define market risk as the risk of economic loss as a consequence of the adverse movement of market rates and prices or credit standings.  We believe our principal market risks are commodity price risk, interest rate risk, and credit risk.

Commodity Price Risk

Historically, we have principally managed the commodity price risk for our coal contract portfolio with long-term coal sales agreements of varying terms and durations.  In recent years, our business has become more variable and less predictable because utilities are adjusting their purchasing pattern based on natural gas prices, weather, and other factors.  Market risk includes the potential for changes in the market value of our coal portfolio, which includes index sales and export pricing.  As of April 18, 2018, we had committed to sell approximately 47 million tons during 2018, all of which are under fixed-price contracts.

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We also face price risk involving other commodities used in our production process, primarily diesel fuel.  Based on our projections of our usage of diesel fuel for the next 12 months, and assuming that the average cost of diesel fuel increases by 10%, we would incur additional fuel costs of approximately $4.6 million over the next 12 months.  Historically, we have used WTI derivative financial instruments to manage certain exposures to diesel fuel prices.  While currently we have no WTI derivative financial instruments in place, we expect to monitor the derivatives market and may use such derivatives in the future.

Interest Rate Risk

Our Credit Agreement, certain of our capital leases, and our A/R Securitization Program are subject to adjustable interest rates.  See Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources” of our 2017 Form 10-K.  We had no outstanding borrowings under our Credit Agreement or A/R Securitization Program as of March 31, 2018.  If we borrow funds under the Credit Agreement or A/R Securitization Program, we may be subject to increased sensitivity to interest rate movements.

Some of the $4.3 million of borrowings under the capital leasing program are also subject to adjustable interest rates although any change to the rate would not have a significant impact on cash flow.  Any future debt arrangements that we enter into may also have adjustable interest rates that may increase our sensitivity to interest rate movements.

Credit Risk

We are exposed to credit loss in the event of non-performance by our counterparties, which may include end-use customers, trading houses, brokers, and financial institutions that hold our investments.  We attempt to manage this exposure by entering into agreements with counterparties that meet our credit standards and that are expected to fully satisfy their obligations under the contracts.  These steps may not always be effective in addressing counterparty credit risk.

When appropriate (as determined by our credit management function), we have taken steps to reduce our credit exposure to customers that do not meet our credit standards or whose credit has deteriorated.  These steps include obtaining letters of credit and requiring prepayments for shipments.  See Item 1A “Risk Factors—Risks Related to Our Business and Industry—We are exposed to counterparty risk with our customers, trading partners, financial institutions, and other parties with whom we conduct business” in our 2017 Form 10-K.

Item 4.  Controls and Procedures.

Disclosure Controls and Procedures

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in the reports we file or submit under the Securities Exchange Act of 1934 (the “Exchange Act”) is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms.  These disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that the information required to be disclosed by us in the reports we file or submit under the Exchange Act is accumulated and communicated to senior management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.  Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of March 31, 2018, and has concluded that such disclosure controls and procedures are effective.

Internal Control over Financial Reporting

During the most recent fiscal quarter, there have been no changes to our internal control over financial reporting that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1.  Legal Proceedings.

See Note 17 of our Unaudited Condensed Consolidated Financial Statements in Part I, Item 1, of this report relating to certain legal proceedings, which information is incorporated by reference herein.

Item 1A.  Risk Factors.

In addition to the other information set forth in this report, including the risk factor set forth below, you should carefully consider the risks and uncertainties described in Item 1A of our 2017 Form 10-K.  The risks described herein and in our 2017 Form 10-K are not the only risks we may face.  If any of those risk factors, as well as other risks and uncertainties that are not currently known to us or that we currently believe are not material, actually occur, our business, financial condition, results of operations, cash flows, and liquidity could be materially and adversely affected.  In our judgment, other than as set forth below, there were no material changes in the risk factors as previously disclosed in Item 1A of our 2017 Form 10-K.

Our reliance on information technology, including systems managed by third parties, exposes us to risks from system failures and cybersecurity incidents that could materially and adversely affect our operations, financial results and reputation and result in significant costs and liabilities.

Our business depends on the reliable and secure operation of computer systems, network infrastructure, digital communication technologies and other information technology.  Problems may arise in both our internally managed systems and those of third parties, including:

·our service providers for technology, communications and data storage;

·our consulting and advisory firms and contractors that have access to our confidential and proprietary data;

·administrators for our employee medical claims;

·rail and export terminal companies that are part of the supply chain for the delivery of our coal;

·coal power generation facilities that purchase our coal; and

·vendors who provide mining equipment, supplies and services necessary for our operations.

These systems could be vulnerable to problems resulting from accidents such as fire, power loss or telecommunication failure.  In addition, these systems could be vulnerable to cybersecurity incidents or other deliberate activities by others.  Cybersecurity risks include those involving unauthorized access, denial-of-service attacks, malicious software, data privacy breaches, cyber or phishing attacks, ransomware, malware, social engineering, physical breaches or other actions.  Cybersecurity risks continue to evolve at a rapid pace.

Although we have implemented information technology controls and systems and provide employee training on phishing, malware, and other cyber risks designed to protect information and mitigate the risk of data loss and other cybersecurity risks, such measures cannot entirely eliminate cybersecurity threats, and the controls we have installed may be breached.  Additionally, we have limited control and visibility over third-party systems that we rely on for our business.  If any of these information technology systems cease to function properly or are breached, we could suffer disruptions to our mining operations and corporate functions and those events may materially and adversely impact our financial results and reputation and result in significant costs and liabilities.

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Although we have not suffered any material losses relating to historical cybersecurity attacks on our systems as of the date of this report, there is no assurance that we will not suffer such losses in the future.  In addition, as cyber threats continue to change, we may be required to expend significant additional resources to continue to modify or enhance our protective measures or to investigate or remediate any cyber vulnerabilities.

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

None.

Item 3.  Defaults Upon Senior Securities.

None.

Item 4.  Mine Safety Disclosures.

The 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 is included in Exhibit 95.1 to this Form 10-Q.

Item 5.  Other Information.

None.

Item 6.  Exhibits.

See Exhibit Index at page 58 of this report.

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EXHIBIT INDEX

The exhibits below are numbered in accordance with the Exhibit Table of Item 601 of Regulation S-K.

Exhibit Number	Description of Documents
3.1	Amended and Restated Certificate of Incorporation of Cloud Peak Energy Inc. effective November 25, 2009 (incorporated by reference to Exhibit 3.1 to Cloud Peak Energy Inc.’s Annual Report on Form 10-K filed on February 14, 2014 (File No. 001-34547))
3.2	Amended and Restated Bylaws of Cloud Peak Energy Inc., effective July 28, 2016 (incorporated by reference to Exhibit 3.2 to Cloud Peak Energy Inc.’s Quarterly Report on Form 10-Q filed on July 28, 2016 (File No. 001-34547))
10.1	Waiver of Employment Agreement for 2018 LTIP Reduction (Colin Marshall) (incorporated by reference to Exhibit 10.1 to Cloud Peak Energy Inc.’s Current Report on Form 8-K filed on March 5, 2018 (File No. 001-34547))
10.2	Waiver of Employment Agreement for 2018 LTIP Reduction (Heath Hill) (incorporated by reference to Exhibit 10.2 to Cloud Peak Energy Inc.’s Current Report on Form 8-K filed on March 5, 2018 (File No. 001-34547))
10.3	Form of 2018 Performance Share Unit Award Agreement under the Cloud Peak Energy Inc. 2009 Long-Term Incentive Plan (as amended and restated) (incorporated by reference to Exhibit 10.3 to Cloud Peak Energy Inc.’s Current Report on Form 8-K filed on March 5, 2018 (File No. 001-34547))
10.4	Form of 2018 Restricted Stock Unit Agreement under the Cloud Peak Energy Inc. 2009 Long-Term Incentive Plan (as amended and restated) (incorporated by reference to Exhibit 10.4 to Cloud Peak Energy Inc.’s Current Report on Form 8-K filed on March 5, 2018 (File No. 001-34547))
10.5*	Modified Federal Coal Lease, WYW-177903: Antelope Coal LLC effective February 1, 2018
10.6*	First Amendment to the Amended and Restated Deferred Compensation Plan for Cloud Peak Energy Resources LLC, effective April 2, 2018
31.1*	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1*	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2*	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
95.1*	Mine Safety Disclosure
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Calculation Linkbase Document
101.LAB*	XBRL Taxonomy Label Linkbase Document
101.PRE*	XBRL Taxonomy Presentation Linkbase Document
101.DEF*	XBRL Taxonomy Definition Document

* Filed or furnished herewith, as applicable

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SIGNATURE

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.

CLOUD PEAK ENERGY INC.

	By:	/s/ HEATH A. HILL
Date: April 26, 2018		Heath A. Hill
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer and Duly Authorized Officer)

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EX-10.5

Exhibit 10.5

Serial Number

WYW177903

September 1, 2011

UNITED STATES

DEPARTMENT OF THE INTERIOR

BUREAU OF LAND MANAGEMENT

MODIFIED COAL LEASE

PART I.

THIS MODIFIED COAL LEASE is entered into on FEB 01 2018, by and between the UNITED STATES OF AMERICA, hereinafter called the Lessor, through the Bureau of Land Management, and

Antelope Coal LLC

P.O. Box 3009

Gillette, WY 82717

hereinafter called Lessee.

This modified lease shall retain the effective date of September 1, 2011, of the original coal lease, and is effective for a period of 20 years therefrom, and for so long thereafter as coal is produced in commercial quantities from the leased lands, subject to readjustment of lease terms at the end of the 20th lease year, September 1, 2031, and each 10-year period thereafter. The next readjustment date for the lease, as modified, will be September 1, 2031.

Sec. 1. This lease is issued pursuant and subject to the terms and provisions of the:

x Mineral Lands Leasing Act of 1920, as amended, 41 Stat. 437, 30 U.S.C. 181-287, hereinafter referred to as the Act;

o Mineral Leasing Act for Acquired Lands of 1947, 61 Stat. 913, 30 U.S.C. 351-359;

and to the regulations and formal orders of the Secretary of the Interior which are now or hereafter in force, when not inconsistent with the express and specific provisions herein.

Sec. 2. Lessee, as the holder of Coal Lease WYW177903, issued effective September 1, 2011, was granted the exclusive right and privilege to drill for, mine, extract, remove or otherwise process and dispose of the coal deposits in, upon, or under the lands described below as being in Converse County, Wyoming:

Sixth Principal Meridian, Wyoming

T. 40 N., R. 71 W.,

sec. 5, lot 18;

sec. 8, lots 1 thru 3, 6 thru 11, and 14 thru 16;

sec. 9, lots 2 thru 16;

sec. 10, lots 5, 6, and 11 thru 14;

sec. 14, lot 13;

sec. 15, lots 2 thru 7 and 10 thru 16.

(Containing 1,908.60 acres, more or less.)

The Lessor, in consideration of fair market value, rents and royalties to be paid, and the conditions and covenants to be observed as herein set forth, hereby grants and leases to Lessee the exclusive right and privilege to drill for, mine, extract, remove, or otherwise process and dispose of the coal deposits in, upon, or under the lands described below as being in Converse County, Wyoming:

1

Sixth Principal Meridian, Wyoming

T. 40 N., R. 71 W.,

sec. 7, lots 5, 11, 12, and 18;

sec. 8, lots 4, 5, 12, and 13;

sec. 17, lots 1 thru 12;

sec. 18, lots 5 and 12(E1/2).

(Containing 856.61 acres, more or less.)

Containing within the lease, as modified, 2,765.21 acres, more or less, together with the right to construct such works, buildings, plants, structures, equipment and appliances and the right to use such on-lease rights-of-way which may be necessary and convenient in the exercise of the rights and privileges granted, subject to the conditions herein provided.

Part II. TERMS AND CONDITIONS

Sec. 1. (a) RENTAL RATE - Lessee must pay Lessor rental annually and in advance for each acre or fraction thereof during the continuance of the lease at the rate of $3.00 per acre for each lease year.

(b) RENTAL CREDITS — Rental will not be credited against either production or advance royalties for any year.

Sec. 2. (a) PRODUCTION ROYALTIES - The royalty will be 12-1/2 percent of the value of the coal produced by strip or augur methods and 8 percent of the value of coal produced by underground mining methods as set forth in the regulations. Royalties are due to Lessor the final day of the month succeeding the calendar month in which the royalty obligation accrues.

(b) ADVANCE ROYALTIES - Upon request by the Lessee, the authorized officer may accept, for a total of not more than 20 years (30 U.S.C. 207 (b)), the payment of advance royalties in lieu of continued operation, consistent with the regulations. The advance royalty will be based on a percent of the value of a minimum number of tons determined in the manner established by the advance royalty regulations in effect at the time the Lessee requests approval to pay advance royalties in lieu of continued operation.

Sec. 3. BONDS - Lessee must maintain in the proper office a lease bond in the amount of $4,000,000. The Authorized Officer may require an increase in this amount when additional coverage is determined appropriate.

Sec. 4. DILIGENCE - This lease is subject to the conditions of diligent development and continued operation, except that these conditions are excused when operations under the lease are interrupted by strikes, the elements, or casualties not attributable to the Lessee. The Lessor, in the public interest, may suspend the condition of continued operation upon payment of advance royalties in accordance with the regulations in existence at the time of the suspension. Lessee must submit an operation and reclamation plan for the BLM’s approval pursuant to 30 U.S.C.207(c) prior to conducting any development or mining operations or taking any other action on the leasehold which might cause a significant disturbance of the environment.

The Lessor reserves the power to assent to or order the suspension of the terms and conditions of this lease in accordance with, inter alia, Section 39 of the Mineral Leasing Act, 30 U.S.C. 209.

Sec. 5. LOGICAL MINING UNIT (LMU) - Either upon approval by the Lessor of the Lessee’s application or at the direction of the Lessor, this lease will become an LMU or part of an LMU, subject to the provisions set forth in the regulations.

The stipulations established in an LMU approval in effect at the time of LMU approval or modification will supersede the relevant inconsistent terms of this lease so long as the lease remains committed to the LMU. If the LMU of which this lease is a part is dissolved, the lease shall then be subject to the lease terms which would have been applied if the lease had not been included in an LMU.

Sec. 6. DOCUMENTS, EVIDENCE AND INSPECTION - At such times and in such form as Lessor may prescribe, Lessee must furnish detailed statements showing the amounts and quality of all products removed and sold from the lease, the proceeds therefrom, and the amount used for production purposes or unavoidably lost.

Lessee must keep open at all reasonable times for the inspection of any duly authorized officer of Lessor, the leased premises and all surface and underground improvements, works, machinery, ore stockpiles, equipment, and all books, accounts, maps, and records relative to operations, surveys, or investigations on or under the leased lands.

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Lessee must allow Lessor access to and copying of documents reasonably necessary to verify Lessee compliance with terms and conditions of the lease.

While this lease remains in effect, information obtained under this section will be closed to inspection by the public in accordance with the Freedom of Information Action (5 U.S.C. 552).

Sec. 7. DAMAGES TO PROPERTY AND CONDUCT OF OPERATIONS - Lessee must comply at its own expense with all reasonable orders of the Secretary, respecting diligent operations, prevention of waste, and protection of other resources.

Lessee must not conduct exploration operations, other than casual use, without an approved exploration plan. All exploration plans prior to the commencement of mining operations within an approved mining permit area must be submitted to the authorized officer.

Lessee must carry on all operations in accordance with approved methods and practices as provided in the operating regulations, having due regard for the prevention of injury to life, health, or property, and prevention of waste, damage or degradation to any land, air, water, cultural, biological, visual, and other resources, including mineral deposits and formations of mineral deposits not leased hereunder, and to other land uses or users. Lessee must take measures deemed necessary by Lessor to accomplish the intent of this lease term. Such measures may include, but are not limited to, modification to proposed siting or design of facilities, timing of operations, and specifications of interim and final reclamation procedures. Lessor reserves to itself the right to lease, sell, or otherwise dispose of the surface or other mineral deposits in the lands and the right to continue existing uses and to authorize future uses upon or in the leased lands, including issuing leases for mineral deposits not covered hereunder and approving easements or rights-of-way. Lessor must condition such uses to prevent unnecessary or unreasonable interference with rights of Lessee as may be consistent with concepts of multiple use and multiple mineral development.

Sec. 8 PROTECTION OF DIVERSE INTERESTS, AND EQUAL OPPORTUNITY - Lessee must: pay when due all taxes legally assessed and levied under the laws of the State or the United States; accord all employees complete freedom of purchase; pay all wages at least twice each month in lawful money of the United States; maintain a safe working environment in accordance with standard industry practices; restrict the workday to not more than 8 hours in any one day for underground workers, except in emergencies; and take measures necessary to protect the health and safety of the public. No person under the age of 16 years should be employed in any mine below the surface. To the extent that laws of the State in which the lands are situated are more restrictive than the provisions in this paragraph, then the State laws apply.

Lessee will comply with all provisions of Executive Order No. 11246 of September 24, 1965, as amended, and the rules, regulations, and relevant orders of the Secretary of Labor. Neither Lessee nor Lessee’s subcontractors should maintain segregated facilities.

Sec. 9. (a) TRANSFERS
(Check the appropriate space)

xThis lease may be transferred in whole or in part to any person, association or corporation qualified to hold such lease interest.

oThis lease may be transferred in whole or in part to another public body, or to a person who will mine the coal on behalf of, and for the use of, the public body or to a person who for the limited purpose of creating a security interest in favor of a lender agrees to be obligated to mine the coal on behalf of the public body.

oThis lease may only be transferred in whole or in part to another small business qualified under 13 CFR 121.

Transfers of record title, working or royalty interest must be approved in accordance with the regulations.

(b) RELINQUISHMENTS - The Lessee may relinquish in writing at any time all rights under this lease or any portion thereof as provided in the regulations. Upon Lessor’s acceptance of the relinquishment, Lessee will be relieved of all future obligations under the lease or the relinquished portion thereof, whichever is applicable.

Sec. 10. DELIVERY OF PREMISES, REMOVAL OF MACHINERY, EQUIPMENT, ETC. - At such time as all portions of this lease are returned to Lessor, Lessee must deliver up to Lessor the land leased, underground timbering, and such other supports and structures necessary for the preservation of the mine workings on the leased premises or deposits and place all workings in condition for suspension or abandonment. Within 180 days thereof, Lessee must remove from the premises all other structures, machinery, equipment, tools, and materials that it elects to or as required by the authorized officer. Any such structures, machinery, equipment, tools, and materials remaining on the leased lands beyond 180 days, or

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approved extension thereof, will become the property of the Lessor, but Lessee may either remove any or all such property or shall continue to be liable for the cost of removal and disposal in the amount actually incurred by the Lessor. If the surface is owned by third parties, Lessor will waive the requirement for removal, provided the third parties do not object to such waiver. Lessee must, prior to the termination of bond liability or at any other time when required and in accordance with all applicable laws and regulations, reclaim all lands the surface of which has been disturbed, dispose of all debris or solid waste, repair the offsite and onsite damage caused by Lessee’s activity or activities incidental thereto, and reclaim access roads or trails.

Sec. 11. PROCEEDINGS IN CASE OF DEFAULT -If Lessee fails to comply with applicable laws, existing regulations, or the terms, conditions and stipulations of this lease, and the noncompliance continues for 30 days after written notice thereof, this lease will be subject to cancellation by the Lessor only by judicial proceedings. This provision will not be construed to prevent the exercise by Lessor of any other legal and equitable remedy, including waiver of the default. Any such remedy or waiver will not prevent later cancellation for the same default occurring at any other time.

Sec. 12. HEIRS AND SUCCESSORS-IN-INTEREST - Each obligation of this lease will extend to and be binding upon, and every benefit hereof shall inure to, the heirs, executors, administrators, successors, or assigns of the respective parties hereto.

Sec. 13. INDEMNIFICATION — Lessee must indemnify and hold harmless the United States from any and all claims arising out of the Lessee’s activities and operations under this lease.

Sec. 14. SPECIAL STATUTES - This lease is subject to the Clean Water Act (33 U.S.C. 1252 et seq.); the Clean Air Act (42 U.S.C. 4274 et seq.), and to all other applicable laws pertaining to exploration activities, mining operations and reclamation, including the Surface Mining Control and Reclamation Act of 1977 (30 U.S.C. 1201 et seq.).

Sec. 15. SPECIAL STIPULATIONS - In addition to observing the general obligations and standards of performance set out in the current regulations, the lessee shall comply with and be bound by the following special stipulations.

These stipulations are also imposed upon the lessee’s agents and employees. The failure or refusal of any of these persons to comply with these stipulations shall be deemed a failure of the lessee to comply with the terms of the lease. The lessee shall require his agents, contractors and subcontractors involved in activities concerning this lease to include these stipulations in the contracts between and among them. These stipulations may be revised or amended, in writing, by the mutual consent of the lessor and the lessee at any time to adjust to changed conditions or to correct an oversight.

(a) CULTURAL RESOURCES - (1) Before undertaking any activities that may disturb the surface of the leased lands, the lessee shall conduct a cultural resource intensive field inventory in a manner specified by the Authorized Officer of the BLM or of the surface managing agency, if different, on portions of the mine plan area and adjacent areas, or exploration plan area, that may be adversely affected by lease-related activities and which were not previously inventoried at such a level of intensity. The inventory shall be conducted by a qualified professional cultural resource specialist (i.e., archeologist, historian, historical architect, as appropriate), approved by the Authorized Officer of the surface managing agency (BLM, if the surface is privately owned), and a report of the inventory and recommendations for protecting any cultural resources identified shall be submitted to the Regional Director of the Western Region of the Office of Surface Mining (the Western Regional Director), the Authorized Officer of the BLM, if activities are associated with coal exploration outside an approved mining permit area (hereinafter called Authorized Officer), and the Authorized Officer of the surface managing agency, if different. The lessee shall undertake measures, in accordance with instructions from the Western Regional Director, or Authorized Officer, to protect cultural resources on the leased lands. The lessee shall not commence the surface disturbing activities until permission to proceed is given by the Western Regional Director or Authorized Officer.

(2) Any existing Class III inventory report covering the lease area that has not received federal agency review must be reviewed and accepted by the agency, site National Registry of Historic Places (NRHP) eligibility determinations made, and consultation with the State Historic Preservation Officer completed before any surface disturbing activities take place.

(3)     Native American consultation is currently being conducted on cultural resource sites 48CA3929, 48CO2934, 48CO2996, and 48CO2997. The lessee shall protect these sites from lease-related activities until the consultation is complete and potential mitigation measures can be implemented as part of an approved mining and reclamation or exploration plan unless modified by mutual agreement in consultation with the Tribal Historical Preservation Officer, Tribal Chairman, or appointed Tribal Cultural Representative.

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(4)      The lessee shall protect all cultural resource properties that have been determined eligible or unevaluated to the NRHP within the lease area from lease-related activities until the cultural resource mitigation measures or site evaluations can be implemented as part of an approved mining and reclamation or exploration plan unless modified by mutual agreement in consultation with the State Historic Preservation Officer.

(5)   The cost of conducting the inventory, preparing reports, and carrying out mitigation measures shall be borne by the lessee.

(6)   If cultural resources are discovered during operations under this lease, the lessee shall immediately bring them to the attention of the Western Regional Director or Authorized Officer, or the Authorized Officer of the surface managing agency, if the Western Regional Director is not available. The lessee shall not disturb such resources except as may be subsequently authorized by the Western Regional Director or Authorized Officer.

Within two (2) working days of notification, the Western Regional Director or Authorized Officer will evaluate or have evaluated any cultural resources discovered and will determine if any action may be required to protect or preserve such discoveries. The cost of data recovery for cultural resources discovered during lease operations shall be borne by the lessee unless otherwise specified by the Authorized Officer of the BLM or of the surface managing agency, if different.

(7)   All cultural resources shall remain under the jurisdiction of the United States until ownership is determined under applicable law.

(b) PALEONTOLOGICAL RESOURCES - If paleontological resources, either large and conspicuous, and/or of significant scientific value are discovered during mining operations, the find will be reported to the Authorized Officer immediately. Mining operations will be suspended within 250 feet of said find. An evaluation of the paleontological discovery will be made by a BLM approved professional paleontologist within five (5) working days, weather permitting, to determine the appropriate action(s) to prevent the potential loss of any significant paleontological value. Operations within 250 feet of such discovery will not be resumed until written authorization to proceed is issued by the Authorized Officer. The lessee will bear the cost of any required paleontological appraisals, surface collection of fossils, or salvage of any large conspicuous fossils of significant scientific interest discovered during the operations.

(c)   THREATENED, ENDANGERED, CANDIDATE, OR OTHER SPECIAL STATUS PLANT AND ANIMAL SPECIES — (1) The lease area may now or hereafter contain plants, animals, or their habitats determined to be threatened or endangered under the Endangered Species Act of 1973, as amended, 16 U.S.C. 1531 et seq., or that have other special status. The Authorized Officer may recommend modifications to exploration and development proposals to further conservation and management objectives or to avoid activity that will contribute to a need to list such species or their habitat or to comply with any biological opinion issued by the Fish and Wildlife Service for the proposed action. The Authorized Officer will not approve any ground-disturbing activity that may affect any such species or critical habitat until it completes its obligations under applicable requirements of the Endangered Species Act. The Authorized Officer may require modifications to, or disapprove a proposed activity that is likely to result in jeopardy to the continued existence of a proposed or listed threatened or endangered species, or result in the destruction or adverse modification of designated or proposed critical habitat.

The lessee shall comply with instructions from the Authorized Officer of the surface managing agency (BLM, if the surface is private) for ground disturbing activities associated with coal exploration on federal coal leases prior to approval of a mining and reclamation permit or outside an approved mining and reclamation permit area. The lessee shall comply with instructions from the Authorized Officer of the Office of Surface Mining Reclamation and Enforcement, or his designated representative, for all ground-disturbing activities taking place within an approved mining and reclamation permit area or associated with such a permit.

(d)   MULTIPLE MINERAL DEVELOPMENT - Operations will not be approved which, in the opinion of the Authorized Officer, would unreasonably interfere with the orderly development and/or production from a valid existing mineral lease issued prior to this one for the same lands.

(e)   OIL AND GAS/COAL RESOURCES - The BLM realizes that coal mining operations conducted on Federal coal leases issued within producing oil and gas fields may interfere with the economic recovery of oil and gas; just as Federal oil and gas leases issued in a Federal coal lease area may inhibit coal recovery. BLM retains the authority to alter and/or modify the resource recovery and protection plans for coal operations and/or oil and gas operations on those lands covered by Federal mineral leases so as to obtain maximum resource recovery.

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(f) RESOURCE RECOVERY AND PROTECTION -Notwithstanding the approval of a resource recovery and protection plan (R2P2) by the BLM, lessor reserves the right to seek damages against the operator/lessee in the event (i) the operator/lessee fails to achieve maximum economic recovery (MER) (as defined at 43 CFR 3480.0-5(21)) of the recoverable coal reserves or (ii) the operator/lessee is determined to have caused a wasting of recoverable coal reserves. Damages shall be measured on the basis of the royalty that would have been payable on the wasted or unrecoverable coal.

The parties recognize that under an approved R2P2, conditions may require a modification by the operator/lessee of that plan. In the event a coal bed or portion thereof is not to be mined or is rendered unmineable by the operation, the operator/lessee shall submit appropriate justification to obtain approval by the Authorized Officer to lease such reserves unmined. Upon approval by the Authorized Officer, such coal beds or portions thereof shall not be subject to damages as described above. Further, nothing in this section shall prevent the operator/lessee from exercising its right to relinquish all or a portion of the lease as authorized by statute and regulation.

In the event the Authorized Officer determines that the R2P2, as approved, will not attain MER as the result of changed conditions, the Authorized Officer will give proper notice to the operator/lessee as required under applicable regulations. The Authorized Office will order a modification if necessary, identifying additional reserves to be mined in order to attain MER. Upon a final administrative or judicial ruling upholding such an ordered modification, any reserves left unmined (wasted) under that plan will be subject to damages as described in the first paragraph under this section.

Subject to the right to appeal hereinafter set forth, payment of the value of the royalty on such unmined recoverable coal reserves shall become due and payable upon determination by the Authorized Officer that the coal reserves have been rendered unmineable or at such time that the operator/lessee had demonstrated an unwillingness to extract the coal.

The BLM may enforce this provision either by issuing a written decision requiring payment of the Office of Natural Resources Revenue (ONRR) demand for such royalties, or by issuing a notice of non-compliance. A decision or notice of non-compliance issued by the lessor that payment is due under this stipulation is appealable as allowed by law.

(g)     PUBLIC LAND SURVEY PROTECTION - The lessee will protect all survey monuments, witness corners, reference monuments, and bearing trees against destruction, obliteration, or damage during operations on the lease areas. If any monuments, corners or  accessories are destroyed, obliterated, or damaged by this operation, the lessee will hire an appropriate county surveyor or registered land surveyor to reestablish or restore the monuments, corners, or accessories at the same locations, using the surveying procedures in accordance with the “Manual of Surveying, Instructions for the Survey of the Public Lands of the United States.” The survey will be recorded in the appropriate county records, with a copy sent to the Authorized Officer.

(h)   PUBLIC ROAD RIGHT-OF-WAY AND BUFFER ZONE - No mining activity of any kind may be conducted within the Converse County Road 37 right-of-way and its associated 100-foot buffer zone while the public road remains in its current (2008) location. The lessee shall recover all legally and economically recoverable coal from al leased lands not within the foregoing right-of-way and associated buffer zone. If a permit is obtained to relocate the public road and it is approved by the appropriate authority, the lessee shall recover all legally and economically recoverable coal from all leased lands within the foregoing right-of-way and associated buffer zone. The lessee shall pay all royalties on any legally and economically recoverable coal which it fails to mine without the written permission of the Authorized Officer.

Antelope Coal LLC		THE UNITED STATES OF AMERICA
By:	/s/ Bruce E Jones	By:	/s/ Duane Spencer
	(Signal of Lessee)		(Signing Officer)
Senior Vice President, Technical Services		Deputy State Director, Lands and Minerals
(Title)		(Title)
1-26-2018		FEB 28 2018
(Date)		(Date)

Title 18 U.S.C. Section 1001, makes it a crime for any person knowingly and willfully to make to any department or agency of the United States any false, fictitious or fraudulent statements or representations as to any matter within its jurisdiction.

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NOTICE FOR LANDS OF THE NATIONAL FOREST SYSTEM
UNDER JURISDICTION OF DEPARTMENT OF AGRICULTURE

R2-FS-2820-13 (92)

Serial No. WYW177903

The permittee/lessee must comply with all the rules and regulations of the Secretary of Agriculture set forth at Title 36, Chapter II, of the Code of Federal Regulations governing the use and management of the National Forest System (NFS) when not inconsistent with the rights granted by the Secretary of Interior in the permit. The Secretary of Agriculture’s rules and regulations must be complied with for (1) all use and occupancy of the NFS prior to approval of an exploration plan by the Secretary of the Interior, (2) uses of all existing improvements, such as forest development roads, within and outside the area permitted by the Secretary of the Interior, and (3) use and occupancy of the NFS not authorized by an exploration plan approved by the Secretary of the Interior.

All matters related to this stipulation are to be addressed to:

Forest Supervisor

Medicine Bow-Routt National Forests & Thunder Basin National Grassland

2468 Jackson Street

Laramie, WY 82070

307-745-2300

who is the authorized representative of the Secretary of Agriculture.

NOTICE

CULTURAL AND PALEONTOLOGICAL RESOURCES - The FS is responsible for assuring that the leased lands are examined to determine if cultural resources are present and to specify mitigation measures. Prior to undertaking any surface-disturbing activities on the lands covered by this lease, the lessee or operator, unless notified to the contrary by the FS, shall:

1.Contact the FS to determine if a site specific cultural resource inventory is required. If a survey is required, then:

2.Engage the services of a cultural resource specialist acceptable to the FS to conduct a cultural resource inventory of the area of proposed surface disturbance. The operator may elect to inventory an area larger than the area of proposed disturbance to cover possible site relocation which may result from environmental or other considerations. An acceptable inventory report is to be submitted to the FS for review and approval at the time a surface disturbing plan of operation is submitted.

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3.Implement mitigation measures required by the FS and BLM to preserve or avoid destruction of cultural resource values. Mitigation may include relocation of proposed facilities, testing, salvage, and recordation or other protective measures. All costs of the inventory and mitigation will be borne by the lessee or operator, and all data and materials salvaged will remain under the jurisdiction of the U.S. Government as appropriate.

The lessee or operator shall immediately bring to the attention of the FS and BLM any cultural or paleontological resources or any other objects of scientific interest discovered as a result of surface operations under this lease, and shall leave such discoveries intact until directed to proceed by FS and BLM.

ENDANGERED OR THREATENED SPECIES - The FS is responsible for assuring that the leased land is examined prior to undertaking any surface-disturbing activities to determine effects upon any plant or animal species listed or proposed for listing as endangered or threatened, or their habitats. The findings of this examination may result in some restrictions to the operator’s plans or even disallow use and occupancy that would be in violation of the Endangered Species Act of 1973 by detrimentally affecting endangered or threatened species or their habitats.

The lessee/operator may, unless notified by the FS that the examination is not necessary, conduct the examination on the leased lands at his discretion and cost. This examination must be done by or under the supervision of a qualified resource specialist approved by the FS. An acceptable report must be provided to the FS identifying the anticipated effects of a proposed action on endangered or threatened species or their habitats.

/s/ Bruce E. Jones

Signature of License Permittee/Lessee

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EX-10.6

Exhibit 10.6

FIRST AMENDMENT TO THE AMENDED AND RESTATED

DEFERRED COMPENSATION PLAN FOR CLOUD PEAK ENERGY RESOURCES LLC

WHEREAS, Cloud Peak Energy Resources LLC (the “Company”), a Delaware limited liability company, adopted the Deferred Compensation Plan For Cloud Peak Energy Resources LLC (the “Plan”) and subsequently amended and restated the Plan effective April 1, 2016; and

WHEREAS, the Company has the ability to amend the Plan pursuant to Section 8.1 of the Plan; and

WHEREAS, the Company desires to amend the Plan to ensure compliance with final regulations that revise the claims procedures regulations under the Employee Retirement Income Security Act of 1974 for employee benefit plans that provide a benefit upon a disability for claims on or after April 2, 2018.

NOW, THEREFORE, the Company hereby amends the Plan in the following respects, effective as April 2, 2018:

1.Section 7.2 of the Plan is amended and restated to read as follows:

7.2Claims Procedure. If any person believes he is being denied any rights or benefits under the Plan, such person may file a claim in writing with the Committee. If any such claim is wholly or partially denied, the Committee will notify such person of its decision in writing. Such notification will be given within 90 days (45 days in the case of a claim regarding Disability) after the claim is received by the Committee. The Committee may extend the period for providing the notification by 90 days (30 days in the case of a claim regarding Disability) if special circumstances require an extension of time for processing the claim and if written notice of such extension and circumstance is given to such person within the initial 90 day period (45 day period in the case of a claim regarding Disability). If such notification is not given within such period, the claim will be considered denied as of the last day of such period and such person may request a review of his claim.  Such notification will contain:

(i)specific reasons for the denial,

(ii)specific reference to pertinent Plan provisions,

(iii)a description of any additional material or information necessary for such person to perfect such claim and an explanation of why such material or information is necessary, and

(iv)a description of the Plan’s review procedures and the time limits applicable to such procedures, including a statement of the person’s right to bring a civil action following an adverse decision on review.

In addition, for a claim regarding Disability, such notification will be provided in a culturally and linguistically appropriate manner and will contain:

(v)a discussion of the decision, including an explanation of the basis for disagreeing with or not following:

(a)the views provided by the claimant’s health care or vocation professionals who treated and evaluated the claimant;

(b)the views of medical or vocational experts whose advice was obtained by the Plan, regardless of whether the advice was relied upon in making the benefit determination; and

(c)any disability determination made by the Social Security Administration,

(vi)if the adverse benefit determination is based on medical necessity, experimental treatment, or similar exclusion or limit, either an explanation of the scientific or clinical judgement for the determination, applying the terms of the Plan to the claimant’s medical circumstances, or a statement that explanation will be provided free of charge upon request,

(vii)the specific internal rules, guidelines, protocols, standards or other similar criteria (a “Guideline”) that were relied upon in making the adverse determination or a statement that such Guideline does not exist, and

(viii)a statement that the claimant is entitled to receive, upon request and free of charge, reasonable access to, and copies of, all documents, records, and other information relevant to the claim for benefits.

2.Section 7.3 of the Plan is amended and restated to read as follows:

7.3Review Procedure.  Within 60 days (180 days in the case of a claim regarding Disability) after the date on which a person receives a written notification of denial of claim (or, if written notification is not provided, within 60 days (180 days in the case of a claim regarding Disability) of the date denial is considered to have occurred), such person (or his duly authorized representative) may (i) file a written request with the Committee for a review of his denied claim and of pertinent documents and (ii) submit written issues and comments to the Committee. The decision on review will be made within 60 days (45 days in the case of a claim regarding Disability). The Committee may extend the period for making the decision on review by 60 days (45 days in the case of a claim regarding Disability) if special circumstances require an extension of time for processing the request such as an election by the Committee to hold a hearing, and if written notice of such extension and circumstances is given to such person within the initial 60-day period (45 days in the case of a claim regarding Disability). If the decision on review is not made within such period, the claim will be considered denied.  In the case of a claim regarding Disability, before a final adverse benefit determination is made, the Committee will provide the claimant, free of charge, with any new or additional evidence or rationale considered, relied upon, or generated by the Plan in connection with the claim as soon as possible and sufficiently in advance of the final notice to give the claimant a reasonable opportunity to respond prior to that date.

The Committee will notify such person of its decision in writing. Such notification will be written in a manner calculated to be understood by such person and will contain specific reasons for the decision as well as specific references to pertinent Plan provisions. The notification will explain that the person is entitled to receive, upon

request and free of charge, reasonable access to and copies of all pertinent documents and has the right to bring a civil action following an adverse decision on review.  In addition, for a claim regarding Disability, the notification will be provided in a culturally and linguistically appropriate manner and will contain:

(i)a discussion of the decision, including an explanation of the basis for disagreeing with or not following the views provided by the claimant’s health care or vocation professionals that treated and evaluated the claimant; the views of medical or vocational experts whose advise was obtained by the Plan, regardless of whether the advice was relied upon in making the benefit determination; and any disability determination made by the Social Security Administration,

(ii)if the adverse benefit determination is based on medical necessity, experimental treatment, or similar exclusion or limit, either an explanation of the scientific or clinical judgement for the determination, applying the terms of the Plan to the claimant’s medical circumstances, or a statement that explanation will be provided free of charge upon request,

(iii)any Guideline that was relied upon in making the adverse determination or a statement that such Guideline does not exist, and

(iv)a summary of the Plan’s review procedures and time limits applicable to such procedures, including a statement of your right to bring a civil action under ERISA section 502(a) following an adverse determination on review, any applicable contractual limitations period that applies to your right to bring such an action and the calendar date on which the contractual limitations period expires for your claim.

3.All other terms of the Plan remain unchanged.

IN WITNESS WHEREOF, the Company has caused this First Amendment to be executed effective as April 2, 2018.

CLOUD PEAK ENERGY RESOURCES LLC

/s/ Amy Clemetson

Amy Clemetson, SVP — Human Resources

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Colin Marshall, certify that:

1.             I have reviewed this quarterly report on Form 10-Q of Cloud Peak Energy Inc.;

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 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 Rules 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 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.

Dated: April 26, 2018	/s/ COLIN MARSHALL
	Colin Marshall
	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Heath A. Hill, certify that:

1.             I have reviewed this quarterly report on Form 10-Q of Cloud Peak Energy Inc.;

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 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 Rules 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 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.

Dated: April 26, 2018	/s/ HEATH A. HILL
	Heath A. Hill
	Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

I, Colin Marshall, the Chief Executive Officer of Cloud Peak Energy Inc. (the “Company”), certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, that:

1.The Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 (the “Periodic Report”) which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Dated: April 26, 2018	/s/ COLIN MARSHALL
	Colin Marshall
	Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

I, Heath A. Hill, the Chief Financial Officer of Cloud Peak Energy Inc. (the “Company”), certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, that:

1.The Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2018 (the “Periodic Report”) which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Dated: April 26, 2018	/s/ HEATH A. HILL
	Heath A. Hill
	Chief Financial Officer

EX-95.1

Exhibit 95.1

MINE SAFETY DISCLOSURE

Strong Safety Performance

One of our most important values is ensuring the safety of our employees and contractors by operating in a safe and responsible manner and protecting the environment in which we live and work.  We have extensive safety systems that have been developed over many years.  We continue to focus on refining these systems and the safety leadership skills of our frontline supervisors.  We spend considerable time working in collaboration with our contractors to improve their safety performance while on our sites.  We use external audits to maintain certifications of our Health, Safety and Environment Management System.  A subset of this system is our certification under ISO-14001 and OHSAS-18001 programs, which cover Environment Management Systems and Occupational Health and Safety.  Our mines are also regularly inspected by the Mine Safety and Health Administration (“MSHA”) and state mine inspectors as part of their normal programs.

For the quarter ended March 31, 2018, the all injury frequency rate (“AIFR”) for our three owned and operated mines was 0.00 (calculated internally based on MSHA methodology).  The AIFR is the number of reportable injuries suffered by mine site employees per 200,000 hours worked.

Federal Mine Safety and Health Act Information

Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) requires issuers to include in periodic reports filed with the Securities and Exchange Commission (“SEC”) certain information relating to citations or orders for violations of standards under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”).  The following disclosures respond to that legislation and are presented in accordance with the SEC’s final rules promulgated under Section 1503 of the Dodd-Frank Act.

Whenever MSHA believes that 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 operator must abate the alleged violation.  In these situations, MSHA typically proposes a civil penalty, or fine, as a result of the alleged violation, that the operator is ordered to pay.  In evaluating the below information regarding mine safety and health, investors should take into account factors such as: (a) the number of citations and orders will vary depending on the size of a coal mine, (b) the number of citations issued will vary from inspector to inspector and mine to mine, and (c) citations and orders can be contested and appealed, and during that process are often reduced in severity and amount, and are sometimes dismissed.

The following table sets out safety-related information required by the Dodd-Frank Act for our three operated mines for the quarter ended March 31, 2018 (amounts in whole dollars).  The mine data retrieval system maintained by MSHA may show information that is different than what is provided herein.  Any such differences may be attributed to the need to update that information on MSHA’s system and/or other factors.

Mine or Operating Name/MSHA Identification Number	Section 104 S&S Citations (#)(1)	Section 104(b) Orders (#)(2)	Section 104(d) Citations and Orders (#)(3)	Section 110(b)(2) Violations (#)(4)	Section 107(a) Orders (#)(5)	Total Dollar Value of MSHA Assessments Proposed ($)(6)	Total Number of Mining Related Fatalities (#)(7)	Received Notice of Pattern of Violations Under Section 104(e) (yes/no) (8)	Received Notice of Potential to Have Pattern Under Section 104(e) (yes/no) (8)	Legal Actions Pending as of Last Day of Period (#)(9)	Legal Actions Initiated During Period (#)(9)	Legal Actions Resolved During Period (#)(9)
Antelope Mine 48-01337	0	0	0	0	0	$2,153	0	No	No	0	0	0
Cordero Rojo Mine 48-00992	0	0	0	0	0	$590	0	No	No	0	0	0
Spring Creek Mine 24-01457	1	0	0	0	0	$1,652	0	No	No	0	0	0

(1)Mine Act Section 104(a) citations are for alleged violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of a coal mine safety or health hazard.

(2)Mine Act Section 104(b) orders are for alleged failures to totally abate a citation within the period of time specified in the citation.

(3)Mine Act Section 104(d) citations and orders are for an alleged unwarrantable failure to comply with mandatory health or safety standards.

(4)Total number of flagrant violations issued under Section 110(b)(2) of the Mine Act.

(5)Mine Act Section 107(a) orders are for alleged conditions or practices that could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated and result in orders of immediate withdrawal from the area of the mine affected by the condition.

(6)Total dollar value of MSHA assessments proposed during the quarter ended March 31, 2018.  Totals include both S&S and non-S&S citation assessments.

(7)Total number of mining-related fatalities during the quarter ended March 31, 2018.

(8)Mine Act Section 104(e) written notices are for an alleged 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 a coal mine health or safety hazard, or the potential to have such a pattern.

(9)Any pending legal action before the Federal Mine Safety and Health Review Commission (the “Commission”) involving a coal mine owned and operated by us.  The number of legal actions pending as of March 31, 2018 that fall into each of the following categories is as follows:

(a)  Contests of citations and orders:  0

(b)  Contests of proposed penalties:  0

(c)  Complaints for compensation under Section 111 of the Mine Act:  0

(d)  Complaints of discharge, discrimination or interference under Section 105 of the Mine Act:  0

(e)  Applications for temporary relief under Section 105(b)(2) of the Mine Act:  0

(f)  Appeals of judges’ decisions or orders to the Commission:  0

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 18, 2018
Document and Entity Information
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018
Entity Common Stock, Shares Outstanding		75,772,193
Entity Registrant Name	CLOUD PEAK ENERGY INC.
Entity Central Index Key	0001441849
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenue	$ 216,309	$ 195,728
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	192,534	170,269
Depreciation and depletion	14,996	18,645
Accretion	1,706	1,821
(Gain) loss on derivative financial instruments	0	2,344
Selling, general and administrative expenses	7,318	10,976
Debt restructuring costs		40
Other operating costs	126	176
Total costs and expenses	216,680	204,271
Operating income (loss)	(371)	(8,543)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	1,617	1,592
Interest income	263	39
Interest expense	(9,188)	(12,912)
Other, net	(268)	(310)
Total other income (expense)	(7,576)	(11,591)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(7,947)	(20,134)
Income tax benefit (expense)	(63)	(300)
Income (loss) from unconsolidated affiliates, net of tax	272	326
Net income (loss)	(7,738)	(20,108)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837)	(1,821)
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	(1,837)	(1,821)
Total comprehensive income (loss)	$ (9,575)	$ (21,929)
Income (loss) per common share
Basic	$ (0.1)	$ (0.3)
Diluted	$ (0.1)	$ (0.3)
Weighted-average shares outstanding - basic	75,329	66,132
Weighted-average shares outstanding - diluted	75,329	66,132

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 127,796	$ 107,948
Accounts receivable	45,025	50,075
Due from related parties	0	122
Inventories, net	70,347	72,904
Income tax receivable	232	256
Other prepaid and deferred charges	23,769	36,964
Other assets	802	1,765
Total current assets	267,971	270,034
Noncurrent assets
Property, plant and equipment, net	1,354,999	1,365,755
Goodwill	2,280	2,280
Income tax receivable	29,454	29,454
Other assets	34,431	31,178
Total assets	1,689,135	1,698,701
Current liabilities
Accounts payable	25,590	29,832
Royalties and production taxes	54,775	54,327
Accrued expenses	37,919	32,818
Due to related parties	71	0
Current portion of federal coal lease obligations	379	0
Other liabilities	2,195	2,435
Total current liabilities	120,929	119,412
Noncurrent liabilities
Senior notes	406,261	405,266
Federal coal lease obligations, net of current portion	1,404	0
Asset retirement obligations, net of current portion	100,817	99,297
Accumulated postretirement medical benefit obligation, net of current portion	25,303	24,958
Royalties and production taxes	28,592	21,896
Other liabilities	6,996	20,063
Total liabilities	690,302	690,892
Commitments and Contingencies (Note 17)
Equity
Common stock ($0.01 par value; 200,000 shares authorized; 76,146 and 75,644 shares issued and 75,669 and 75,167 outstanding as of March 31, 2018 and December 31, 2017, respectively)	757	752
Treasury stock, at cost (477 shares as of both March 31, 2018 and December 31, 2017)	(6,498)	(6,498)
Additional paid-in capital	653,176	652,702
Retained earnings	339,429	347,046
Accumulated other comprehensive income (loss)	11,969	13,807
Total equity	998,833	1,007,809
Total liabilities and equity	$ 1,689,135	$ 1,698,701

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2018	Dec. 31, 2017
CONDENSED CONSOLIDATED BALANCE SHEETS
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	76,146	75,644
Common stock, shares outstanding	75,669	75,167
Treasury stock, shares	477	477

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income (loss)	$ (7,738)	$ (20,108)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and depletion	14,996	18,645
Accretion	1,706	1,821
Loss (income) from unconsolidated affiliates, net of tax	(272)	(326)
Distributions of income from unconsolidated affiliates	1,000	3,000
Equity-based compensation expense	(1,709)	1,823
(Gain) loss on derivative financial instruments	0	2,344
Cash received (paid) for derivative financial instruments settlements	0	(336)
Non-cash interest expense related to early retirement of debt and refinancings	0	702
Net periodic postretirement benefit costs	(1,421)	(1,368)
Addback of debt restructuring costs		40
Payments for logistics contracts	(2,500)	(13,563)
Logistics throughput contract amortization expense	4,161	10,578
Other	2,075	2,150
Changes in operating assets and liabilities:
Accounts receivable	5,050	16,613
Inventories, net	2,523	(1,373)
Due to or from related parties	193	(419)
Other assets	6,524	(8,024)
Accounts payable and accrued expenses	(327)	7,744
Asset retirement obligations	(185)	(248)
Net cash provided by (used in) operating activities	24,076	19,695
Investing activities
Purchases of property, plant and equipment	(2,646)	(4,124)
Investment in development projects	(360)	0
Other	0	0
Net cash provided by (used in) investing activities	(3,006)	(4,124)
Financing activities
Principal payments on federal coal leases	574	0
Repayment of senior notes	0	(62,094)
Payment of debt refinancing costs	0	(402)
Payment of debt restructuring costs	0	(40)
Proceeds from issuance of common stock	0	68,850
Cash paid for equity offering	0	(4,434)
Other	(648)	(644)
Net cash provided by (used in) financing activities	(1,222)	1,236
Net increase (decrease) in cash, cash equivalents, and restricted cash	19,848	16,807
Cash, cash equivalents, and restricted cash at beginning of period	108,673	84,433
Cash, cash equivalents, and restricted cash at end of period	$ 128,521	$ 101,240

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Organization and Business

3 Months Ended

Mar. 31, 2018

Organization and Business

Organization and Business

1. Organization and Business

We are one of the largest producers of coal in the United States of America (“U.S.”) and the Powder River Basin (“PRB”), based on our 2017 coal sales. We operate some of the safest mines in the coal industry. According to the most current Mine Safety and Health Administration (“MSHA”) data, we have one of the lowest employee all injury incident rates among the largest U.S. coal producing companies. We currently operate solely in the PRB, the lowest cost region of the major coal producing regions in the U.S., where we own and operate threesurface coal mines: the Antelope Mine, the Cordero Rojo Mine, and the Spring Creek Mine.

Our Antelope Mine and Cordero Rojo Mine are located in Wyoming and our Spring Creek Mine is located in Montana.  Our mines produce subbituminous thermal coal with low sulfur content, and we sell our coal primarily to domestic and foreign electric utilities.  Thermal coal is primarily consumed by electric utilities and industrial consumers as fuel for electricity generation.  In 2017, the coal we produced generated approximately 2% of the electricity produced in the U.S. We do not produce any metallurgical coal.

In addition, we have twodevelopment projects, both located in the Northern PRB. For purposes of this report, the term “Northern PRB” refers to the area within the PRB that lies within Montana and the northern part of Sheridan County, Wyoming. The Youngs Creek project is an undeveloped surface mine project located in Wyoming, seven miles south of our Spring Creek Mine and contiguous with the Wyoming-Montana state line. The Big Metal project is located near the Youngs Creek project on the Crow Indian Reservation in southeast Montana.

Our logistics business provides a variety of services designed to facilitate the sale and delivery of coal.  These services include the purchase of coal from third parties or from our owned and operated mines, coordination of the transportation and delivery of purchased coal, negotiation of take-or-pay rail agreements and take-or-pay port agreements and demurrage settlement with vessel operators.  See Note 5 for further discussion.

Principles of Consolidation

The accompanying Unaudited Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). In accordance with U.S. GAAP for interim financial statements, these Unaudited Condensed Consolidated Financial Statements do not include certain information and footnote disclosures that are required to be included in annual financial statements prepared in conformity with U.S. GAAP. The year-end Unaudited Condensed Consolidated Balance Sheet data was derived from the Audited Consolidated Financial Statements. Accordingly, these Unaudited Condensed Consolidated Financial Statements should be read in conjunction with the Audited Consolidated Financial Statements as of December 31, 2017 and 2016, and for each of the three years ended December 31, 2017, included in our Annual Report on Form 10-K for the year ended December 31, 2017 (“2017 Form 10-K”).In the opinion of management, the accompanying Unaudited Condensed Consolidated Financial Statements contain all adjustments, which are of a normal and recurring nature, necessary for a fair statement of our financial position as of March 31,2018, and the results of our operations, comprehensive income (loss), and cash flows for the threemonths ended March 31,2018 and 2017, in conformity with U.S. GAAP.Our results of operations for the three months ended March 31,2018are not necessarily indicative of the results that may be expected for future quarters or for the year ending December 31, 2018.

The preparation of our Unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires our management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates in these Unaudited Condensed Consolidated Financial Statements include: assumptions about the amount and timing of future cash flows and related discount rates used in determining asset retirement obligations (“AROs”) and in testing long-lived assets and goodwill for impairment; the fair value of derivative financial instruments; the calculation of mineral reserves; equity-based compensation expense; workers’ compensation claims; reserves for contingencies and litigation; useful lives of long-lived assets; postretirement employee benefit obligations; the recognition and measurement of income tax benefits and related deferred tax asset valuation allowances; and allowances for inventory obsolescence and net realizable value. Actual results could differ materially from those estimates.

Due to the tabular presentation of rounded amounts, certain tables reflect insignificant rounding differences.

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Accounting Policies and Standards Update

3 Months Ended

Mar. 31, 2018

Accounting Policies and Standards Update

Accounting Policies and Standards Update

2. Accounting Policies and Standards Update

Recently Issued Accounting Pronouncements

From time to time, the Financial Accounting Standards Board (“FASB”) or other standard setting bodies issue new accounting pronouncements. Updates to the FASB Accounting Standards Codification are communicated through issuance of an Accounting Standards Update (“ASU”). Unless otherwise discussed, we believe that the impact of recently issued guidance will not be material to our consolidated financial statements upon adoption.

In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“ASU 2018-02”), which allows companies to make a one-time reclassification of the stranded tax effects (as defined by ASU 2018-02) from accumulated other comprehensive income to retained earnings as a result of the tax legislation enacted in December 2017, commonly known as the “Tax Cuts and Jobs Act” (”TCJA”), and requires certain disclosures about stranded tax effects.The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years.  Early adoption is permitted. The amendments in this update should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effects of the change in the U.S. federal corporate income tax rate in the TCJA is recognized. We are still evaluating the impact the adoption of ASU 2018-02 will have. We will adopt the new standard as of January 1, 2019.

In January 2017, the FASB issued ASU 2017-04, Goodwill — Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which eliminates the second step in the goodwill impairment test whereby a company measures an impairment loss by calculating the implied fair value of goodwill of a reporting unit and comparing it against its carrying value. As a result, a goodwill impairment loss will be calculated by comparing the fair value of a reporting unit with its carrying amount. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years.  Early adoption is permitted.  The amendments in this update should be applied prospectively, with added disclosure regarding the nature of and reason for the change in accounting principal. We will adopt the new standard as of January 1, 2020.

In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”), which would require the lessee to recognize the assets and liabilities on all leases that may have not been recognized in the past. The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We will adopt the new standard effective January 1, 2019.  The amendments in this update should be applied at the beginning of the earliest period presented using a modified retrospective approach. We began our review of our contracts with vendors in 2017 and will continue to evaluate the impact of the adoption of ASU 2016-02 throughout 2018. However, based upon our initial reviews and the future payments under operating leases disclosed in our 2017 Form 10-K, we do not currently anticipate that adoption of this standard will have a significant impact on our results of operations, financial position, and cash flows.

Recently Adopted Accounting Pronouncements

In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation – Scope of Modification Accounting (“ASU 2017-09”), which provides guidance about the types of changes to terms or conditions of a share-based payment award that would require an entity to apply modification accounting. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied prospectively to an award modified on or after the adoption date. We adopted this standard on January 1, 2018.

In March 2017, the FASB issued ASU 2017-07, Compensation – Retirement Benefits – Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Cost (“ASU 2017-07”), which requires separate presentation of service costs and all other components of net benefit costs on the income statement. Under ASU 2017-07, service cost is included in the same line item as other compensation costs arising from services rendered by employees during the period, with all other components of net benefit costs on the income statement outside of income from operations. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  We adopted this standard on January 1, 2018. We retrospectively adopted the presentation of service costs separate from the other components of net periodic costs. The interest costs and amortization of prior service costs have been reclassified from Cost of product sold and Selling, general and administrative expenses to Net periodic postretirement benefit income (cost), excluding service cost.

The effect of the retrospective presentation change related to the net periodic cost of our other postretirement employee benefits (“OPEB”) plan on our Unaudited Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) for the three months ended March 31, 2017 was as follows (in thousands):

	Three Months Ended
	March 31, 2017
	Previously Reported		Adjustment		As Revised
Cost of product sold	$	168,939	$	1,330	$	170,269
Selling, general and administrative expenses	$	10,714	$	262	$	10,976
Operating income (loss)	$	(6,951)	$	(1,592)	$	(8,543)
Net periodic postretirement benefit income (cost),
excluding service cost	$	―	$	1,592	$	1,592
Total other income (expense)	$	(13,183)	$	1,592	$	(11,591)

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows — Restricted Cash (“ASU 2016-18”), which requires the statement of cash flows to explain the change during the period in total cash, cash equivalents, and amounts generally described as restricted cash and restricted cash equivalents. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied using a retrospective transition method to each period presented. We adopted this standard on January 1, 2018. Refer to Note 19, as well as the Unaudited Condensed Consolidated Statements of Cash Flows, for further information regarding the reconciliation of cash, cash equivalents, restricted cash, and restricted cash equivalents.

In October 2016, the FASB issued ASU 2016-16, Accounting for Income Taxes — Intra-Entity Asset Transfers of Assets other than Inventory (“ASU 2016-16”), which would require the recognition of the tax expense from the sale of an asset other than inventory when the transfer occurs, rather than when the asset is sold to a third party or otherwise recovered through use. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years.  The amendments in this update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. We adopted this standard on January 1, 2018. We completed a review of our intra-entity transfers as of December 31, 2017, and determined that ASU 2016-16 does not have an impact on our Unaudited Condensed Consolidated Financial Statements.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), which standardizes cash flow statement classification of certain transactions, including cash payments for debt prepayment or extinguishment, proceeds from insurance claim settlements, and distributions received from equity method investments. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The amendments in this update should be applied using a retrospective transition method to each period presented. If impracticable to apply the amendments retrospectively for some of the issues, the amendments for those issues would be applied prospectively as of the earliest date practicable. We adopted this standard on January 1, 2018, with no impact on our Unaudited Condensed Consolidated Statements of Cash Flows.

From May 2014 through December 2016, the FASB issued several ASUs related to Revenue from Contracts with Customers (“ASC 606”).  These ASUs are intended to provide greater insight into both revenue that has been recognized and revenue that is expected to be recognized in the future from existing contracts.  The core principle of the new standard is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new guidance is effective for interim and annual periods beginning after December 15, 2017.  The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. We have adopted the new standard as of January 1, 2018 and utilized the modified retrospective method. This approach allowed us to apply the new standard to (1) all new contracts entered into after January 1, 2018 and (2) all existing contracts for which all (or substantially all) of the revenue has not been recognized under legacy revenue guidance as of January 1, 2018 through a cumulative adjustment to equity. Consolidated revenue presented in our comparative financial statements for periods prior to January 1, 2018has not been revised and continues to be reported under legacy revenue recognition guidance.

The following table reflects the adoption of ASC 606 on our Unaudited Condensed Consolidated Balance Sheets as of January 1, 2018 (in thousands):

	Balance as of December 31, 2017		Adjustment Due to ASC 606		Balance as of January 1, 2018
Assets
Accounts receivable	$	50,075	$	781	$	50,856
Inventories, net	$	72,904	$	(660)	$	72,244
Equity
Retained Earnings	$	347,046	$	121	$	347,167

As part of the adoption of ASC 606, we also will not recognize approximately 64,400 tons that were delivered in January 2018 in our tons sold figure for 2018. These tons were delivered on a contract where title transferred to the customer upon delivery, while risk of loss transferred at the shipping point, or the mine. Under legacy revenue recognition guidance, the revenue related to these tons was recognized upon delivery. However, under ASC 606, revenue is now recognizedat the shipping point, as this is when control passes to the customer. As of December 31, 2017, these tons were appropriately placed back into inventory in accordance with legacy revenue recognition guidance. The revenue recognition process was complete upon adoption of ASC 606 on January 1, 2018.

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Revenue

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Revenue From Contract With Customer [Text Block]

3. Revenue

In accordance with the new revenue standard requirements, the disclosure of the impact of the adoption of ASC 606 on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) and Unaudited Condensed Consolidated Balance Sheets is as follows (in thousands):

	Three Months Ended
	March 31, 2018
		As Reported		Balances Without the Adoption of ASC 606		Effect of ChangeHigher(Lower)
Revenue		$	216,309	$	217,091	$	(781)
Cost of product sold		$	192,534	$	193,194	$	(660)
Net income (loss)		$	(7,738)	$	(7,617)	$	(121)
Income (loss) per common share:
Basic		$	(0.10)	$	(0.10)	$	—
Diluted		$	(0.10)	$	(0.10)	$	—

	March 31, 2018
		As Reported		Balances Without the Adoption of ASC 606		Effect of Change Higher (Lower)
Accounts receivable		$	45,025	$	45,025	$	—
Inventories, net		$	70,347	$	70,347	$	—
Retained earnings		$	339,429	$	339,429	$	—

Revenue from Contracts with Customers

We account for a contract with a customer when the parties have approved the contract and are committed to performing their respective obligations, the rights of each party are identified, payment terms are identified, the contract has commercial substance, and collectability of consideration is probable. We recognize revenue when we satisfy a performance obligation by transferring control of a good or service to a customer.

Our revenue is derived from sales to customers of coal produced at our facilities and coal purchased from other companies. We categorize our customers by how we sell coal to them. Our mine customers purchase coal directly from our mine sites, where the sale occurs at the mine site and where title, risk of loss, and control typically pass to the customer at that point. This revenue is generally recorded in our Owned and Operated Mines Segment. Mine customers arrange for and bear the costs of transporting their coal from our mines to their plants or other specified discharge points. Our mine customers are typically domestic utility companies primarily located in the mid-west and south central U.S., although we also sell to other domestic utility companies, as well as to third-party brokers. Our coal sales agreements with our mine customers are generally fixed-price, fixed-volume supply contracts, or include a pre-determined escalation in price for each year. Some of our customer contracts may include variable pricing and volumes. Price re-opener and index provisions may allow either party to commence a renegotiation of the contract price at a pre-determined time. Price re-opener provisions may automatically set a new price based on prevailing market price or, in some instances, require us to negotiate a new price, sometimes within specified ranges of prices. In some agreements, if the parties do not agree on a new price, either party has an option to terminate the contract. Under some of our contracts, we have the right to match lower prices offered to our customers by other suppliers. The terms of our coal sales agreements result from competitive bidding and extensive negotiations with customers. Consequently, the terms of these contracts vary by customer.

Our logistics customers purchase coal from us, along with logistics services to deliver the coal to the customer at a terminal or the customer’s plant or other delivery point remote from our mine site. Title, risk of loss, and control pass to the customer at the remote delivery point. This revenue is recorded in our Logistics and Related Activities Segment. Our logistics services are designed to facilitate the sale and delivery of coal. These services include the purchase of coal from third parties or from our owned and operated mines, coordination of the transportation and delivery of purchased coal, negotiation of take-or-pay rail agreements and take-or-pay port agreements and demurrage settlements with vessel operators. We also bear the costs of transporting the coal to the delivery point. For our international customers, this means that we cover the costs associated with an export terminal located in the Pacific Northwest. Refer to Note 5 for further information. Our logistics customers located overseas are generally responsible for paying the cost of ocean freight, although occasionally we may arrange or be responsible for the cost of that transportation as well. Logistics customers are primarily foreign and domestic utility companies as well as third-party brokers. With respect to our international sales, at present, we are primarily focused on end-user customers. However, a small portion of our sales are made to international traders who sell on to end-user customers. Our coal sales agreements with our domestic logistics customers are generally fixed-price, fixed-volume supply contracts with terms of one to three years. The terms of our coal sales agreements result from competitive bidding and extensive negotiations with customers. Consequently, the terms of these contracts vary by customer. With our international logistics customers, we often enter into contracts that contain multi-year terms with future year pricing to be agreed upon, meaning that there is an expectation of sales, provided that mutual agreement on pricing can be reached. This is consistent with conventional industry standards for sales into the Asian Pacific region. We typically agree upon volumes and pricing under these international customer agreements three to six months in advance of shipment. Our Asian delivered shipments are typically priced broadly in line with a number of relevant international coal indices adjusted for energy content and other quality and delivery criteria. These indices include the Newcastle benchmark price, as published by Global Coal and others, and the Platts Kalimantan 5000. Contracts with our logistics customers include terms similar to those described for our mine customers and may also include terms relating to: demurrage fees for international contracts, fixed pricing for the current year of sales, and additional coal quality requirements.

Coal sales agreements with both mine and logistics customers typically contain coal quality specifications. With coal quality specifications in place, the raw coal sold by us to the customer at the delivery point must be substantially free of magnetic material and other foreign material impurities, and crushed to a maximum size as set forth in the respective coal sales agreement. Prior to billing the customer, price adjustments are made based on quality standards that are specified in the coal sales agreement, such as Btu factor, moisture, ash, and sodium content and can result in either increases or decreases in the value of the coal shipped.

Disaggregation of Revenue

In the following table, Revenue is disaggregated by primary geographic markets, as we believe this best depicts how the nature, amount, timing, and uncertainty of our revenue and cash flows are affected by economic factors (in thousands):

	Three Months Ended
	March 31,
	2018		2017
United States (1)	$	138,232	$	170,866
South Korea (2)		66,021		16,961
Other (2)		12,056		7,901
Total revenue from external customers	$	216,309	$	195,728

(1)The majority of our domestic revenue is attributable to the Owned and Operated segment.

(2)All South Korean revenue and the majority of Other geographical revenue is attributable to our Logistics and Related Activities segment.

We attribute revenue to individual countries based on the location of the physical delivery of the coal. All of our revenue for the three months ended March 31,2018and 2017 originated in the United States.

Performance Obligations

A performance obligation is a promise in a contract with a customer to provide distinct goods or services. Performance obligations are the unit of account for purposes of applying the revenue recognition standard and therefore determine when and how revenue is recognized. In most of our contracts, the customer contracts with us to provide coal that meets certain quality criteria, and, for our logistics customers, delivery of that coal to a certain destination. These promises are highly interrelated and interdependent, and cannot be transferred to the customer without the other promises in the contract also being fulfilled. As such, these promises are not separately identifiable within the context of the contract, and therefore, are not distinct. Therefore, the entire contract is accounted for as one performance obligation. We allocate the transaction price based on the base price per the contract, which is also the standalone selling price, increased or decreased for quality adjustments.

Under ASC 606, shipping and handling services may be considered a separate performance obligation if control of the goods transfers to the customer before shipment, but the entity has promised to ship the goods, or arrange for their shipment. In contrast, if control of a good does not transfer to the customer before shipment, shipping is not a promised service to the customer. This is because shipping is a fulfillment activity as the costs are incurred as part of transferring the goods to the customer. ASC 606 includes an accounting policy election that permits entities to account for shipping and handling activities that occur after the customer has obtained control of a good as fulfillment cost rather than as an additional promised service. We have made this accounting policy election, and will recognize the corresponding transportation expenses for contracts in which we arrange and pay for shipping costs when the customer has obtained control of the related coal.

We generally recognize revenue at a point in time as the customer does not have control over the asset at any point during the fulfillment of the contract. For the majority of our customers in our Owned and Operated Segment, this is supported by the fact that title and risk of loss transfer to the customer upon loading of the railcar at the mine. This is also the point at which physical possession of the coal transfers to the customer, as well as the significant risks and rewards in ownership of the coal. Similarly, for customers in our Logistics and Related Activity Segment, this is supported by the fact that title and risk of loss transfer to the customer when the coal is delivered to an agreed-upon destination or loaded and trimmed on a vessel. This is also the point at which physical possession of the coal transfers to the customer, as well as the significant risks and rewards in ownership of the coal.

In our Owned and Operated Segment, we have remaining performance obligations relating to fixed priced contracts of approximately $777 million, which represent the average fixed prices on our committed contracts as of March 31,2018. We expect to recognize approximately 80% of this revenue through 2019, with the remainder recognized thereafter. We have remaining performance obligations relating to index priced contracts or contracts with price reopeners of approximately $280 million, which represent the average re-opener/indexed price on committed contracts as of March 31,2018. We expect to recognize approximately 30% of this revenue through 2019, with the remainder recognized thereafter. In our Logistics and Related Activities segment, we have remaining performance obligations relating to our fixed price contracts of approximately $102 million, which we expect to recognize in 2018.

The tons used to determine the remaining performance obligations are subject to adjustment in instances of force majeure and exercise of customer options to either take additional tons, or reduce tonnage, if such option exists in the customer contract. Furthermore, export tons are subject to adjustment upon loading of vessels at the port and therefore represent the estimated tons we anticipate shipping. The elimination of the purchase and sale of coal between reportable segments is not reflected above.

Contract Balances

Under ASC 606, the timing of when a performance obligation is satisfied can affect the presentation of accounts receivable, contract assets, and contract liabilities. The main distinction between accounts receivable and contract assets is whether consideration is conditional on something other than the passage of time. A receivable is an entity’s right to consideration that is unconditional. Under the typical payment terms of our contracts with customers, the customer pays us a base price for the coal, increased or decreased for any quality adjustments. In our contracts with mine customers, adjustments are known at the time of invoicing as we conduct our own tests of quality. In contracts with our logistics customers, adjustments are also known at the time of billing as they are based on quality tests performed at the port. Amounts billed and due are recorded as trade accounts receivable and included in Accounts receivable on our Unaudited Condensed Consolidated Balance Sheets. In cases where we invoice based on customers’ quality tests, we estimate the transaction price using our quality testing results. Historically, the difference between customers’ testing results and our testing results have been immaterial. We do not currently have any contracts in place where we would transfer coal in advance of knowing the final price of the coal sold, and thus do not have any contract assets recorded. Contract liabilities arise when consideration is received in advance of performance. This deferred revenue is included in Accrued expenses on our Unaudited Condensed Consolidated Balance Sheets when consideration is received and revenue is not recognized until the performance obligation is satisfied. We are rarely paid in advance of performance and do not currently have any deferred revenue recorded on our Unaudited Condensed Consolidated Balance Sheets.

Accounts receivable consisted of the following (in thousands):

	March 31,		December 31,
	2018		2017
Trade accounts receivable	$	44,606	$	47,872
Other receivables		419		2,203
Accounts receivable	$	45,025	$	50,075

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Segment Information

3 Months Ended

Mar. 31, 2018

Segment Information

Segment Information

4. Segment Information

We have two reportable segments; our Owned and Operated Mines segment and our Logistics and Related Activities segment.

Our Owned and Operated Mines segment is characterized by the predominant focus on thermal coal production where the sale occurs at the mine site and where title and risk of loss generally pass to the customer at that point. This segment includes our Antelope Mine, Cordero Rojo Mine, and Spring Creek Mine. Sales in this segment are primarily to domestic electric utilities and some industrials, although a portion may be made to our Logistics and Related Activities segment. Sales between reportable segments are priced based on prevailing market prices for arm’s length transactions. Our mines utilize surface mining extraction processes and are all located in the PRB. The gains and losses resulting from any domestic coal futures contracts and WTI derivative financial instruments are reported within this segment.

Our Logistics and Related Activities segment is characterized by the services we provide to our international and certain of our domestic customers where we deliver coal to the customer at a terminal or the customer’s plant or other delivery point, remote from our mine site. Services provided include the purchase of coal from third parties or from our Owned and Operated Mines segment, at market prices, as well as the contracting and coordination of the transportation and other handling services from third-party operators, which are typically rail and terminal companies and may include chartering of a vessel. Title and risk of loss are retained by the Logistics and Related Activities segment through the transportation and delivery process. Title and risk of loss pass to the customer in accordance with the contract and typically occur at a vessel loading terminal, a vessel unloading terminal or an end use facility. Risk associated with rail and terminal take-or-pay agreements is also borne by the Logistics and Related Activities segment. The gains and losses resulting from any international coal forward contracts and international coal put options are reported within this segment. Amortization related to the amended port and rail take-or-pay agreements are also included in this segment. See Note 5 for additional information about the amended transportation agreements. Incremental production taxes and royalties associated with the sales made by our Logistics and Related Activities segment are included in this segment for the current year. These taxes and royalties were immaterial in the prior year and have not been reclassified from the Owned and Operated Mines segment.

Our business activities that are not considered operating segments are included in Other, although they are not required to be included in this footnote. They are provided for reconciliation purposes and include Selling, general and administrative expenses (“SG&A”) as well as results relating to broker activity.

Eliminations represent the purchase and sale of coal between reportable segments and the associated elimination of intercompany profit or loss in inventory and are provided for reconciliation purposes.

Revenue

The following table presents Revenue (in thousands):

	Three Months Ended
	March 31,
		2018		2017
Owned and Operated Mines	$	153,653	$	173,611
Logistics and Related Activities		79,636		28,248
Other		3		1,293
Eliminations		(16,983)		(7,424)
Consolidated	$	216,309	$	195,728

Capital Expenditures

The following table presents purchases of property, plant and equipment, investment in development projects, and capital expenditures included in Property, plant and equipment, net, Other assets, and Accounts payable (in thousands):

	Three Months Ended
	March 31,
		2018		2017
Owned and Operated Mines	$	6,182	$	4,596
Logistics and Related Activities		—		—
Other		31		397
Consolidated	$	6,213	$	4,993

Adjusted EBITDA

EBITDA represents net income (loss) before: (1) interest income (expense) net, (2) income tax provision, (3) depreciation and depletion, and (4) amortization. Adjusted EBITDA represents EBITDA as further adjusted for accretion, which represents non-cash increases in asset retirement obligation liabilities resulting from the passage of time, and specifically identified items that management believes do not directly reflect our core operations. The specifically identified items that we routinely adjust for are: (1) adjustments to exclude non-cash impairment charges, (2) adjustments for derivative financial instruments, excluding fair value mark-to-market gains or losses and including cash amounts received or paid, (3) adjustments to exclude debt restructuring costs, and (4) non-cash throughput amortization expense and contract termination payments made to amend the BNSF and Westshore agreements.

Adjusted EBITDA is an additional tool intended to assist our management in comparing our performance on a consistent basis for purposes of business decision making by removing the impact of certain items that management believes do not directly reflect our core operations.  Adjusted EBITDA is a metric intended to assist management in evaluating operating performance, compensation decisions, comparing performance across periods, planning and forecasting future business operations and helping determine levels of operating and capital investments.

The following table reconciles segment Adjusted EBITDA to Income (loss) before income tax provision and earnings from unconsolidated affiliates (in thousands):

			Three Months Ended
			March 31,
			2018		2017
Adjusted EBITDA
Owned and Operated Mines			$	18,616	$	33,738
Logistics and Related Activities				7,098		(2,564)
Total Adjusted EBITDA for reportable segments				25,714		31,174
Unallocated net expenses				(6,072)		(10,744)
Adjustments to Income (loss) before income tax provision
	and earnings from unconsolidated affiliates
Depreciation and depletion				(14,996)		(18,645)
Accretion				(1,706)		(1,821)
Debt restructuring costs				—		(40)
	Derivative financial instruments:
		Gain (loss) on derivative financial instruments (1)		—		(2,344)
		Inclusion of cash amounts (received) paid (2)		—		336
Total derivative financial instruments				—		(2,008)
Interest expense, net				(8,925)		(12,873)
(Income) loss from unconsolidated affiliates, net of tax				(272)		(326)
Non-cash throughput amortization expense and
	contract termination payments			(1,690)		(4,851)
Income (loss) before income tax provision and earnings from
	unconsolidated affiliates		$	(7,947)	$	(20,134)

• (Gain) loss on derivative financial instruments reflected in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).
• Cash amounts received and paid reflected within operating cash flows in the Unaudited Condensed Consolidated Statements of Cash Flows.

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Transportation Agreements

3 Months Ended

Mar. 31, 2018

Transportation Agreements

Transportation agreements

5. Transportation Agreements

To ensure export terminal and rail capacity for export sales, we enter into multi-year throughput agreements with export terminal companies and railroads. These types of take-or-pay agreements require us to pay for a minimum quantity of coal to be transported on the railway or through the terminal regardless of whether we sell any coal. If we fail to make sufficient export sales to meet our minimum obligations under the take-or-pay agreements, we are still obligated to make payments to the export terminal company and railroad.

We have a throughput agreement with Westshore Terminals Limited Partnership (“Westshore”) for our anticipated export sales through their export terminal in Vancouver, British Columbia, and a similar agreement with Burlington Northern Santa Fe Railroad (“BNSF”).

Current Agreements

In December 2016, we terminated our previous agreement with Westshore and entered into a new agreement effective January 1, 2017. In February 2017, we terminated our previous agreement with BNSF and entered into a new agreement effective April 1, 2017. These new agreements provided for shipments in 2017 and 2018 and required minimum payments for those two years. In exchange for the termination of the previous agreements in 2015 and 2016, we made termination payments. These amounts have been deferred and will be amortized, along with the previous amendment payments made in 2015, over the remaining life of the new agreements.

In December 2017 and January 2018, we extended the agreements with Westshore and BNSF, respectively, through the end of 2020 with minimum payment commitments for each year. We have the right to terminate our commitments for the remaining years at any time in exchange for buyout payments. Additionally, after the new Westshore agreement terminates and through 2024, if we choose to ship to export customers, we are required to offer to ship through Westshore up to a specified annual tonnage on terms similar to the new agreement before shipping through any other export terminal. Westshore has the right to accept or reject our offer in its sole discretion.

As of March 31,2018 and December 31, 2017, there was $20.8 million and $22.4 million, respectively, recorded as a deferred asset for these agreements. As of March 31,2018 and December 31, 2017, $15.3 million and $22.4 million, respectively, is included in Other prepaid and deferred charges in the Unaudited Condensed Consolidated Balance Sheets. $5.5 million is included in noncurrent Other assets in the Unaudited Condensed Consolidated Balance Sheets as of March 31,2018. We incurred $52.3 million and $24 million in costs under our logistics agreements with Westshore and BNSF, including amortization of $4.2 million and $10.6 million, during the three monthsended March 31,2018and 2017, respectively. These costs are included in Cost of product sold in the Unaudited Condensed Statements of Operations and Comprehensive Income (Loss).

We had outstanding purchase commitments related to transportation agreements consisting of the following (in thousands):

		March 31,		December 31,
		2018		2017
Services
	Transportation agreements (1) (2)	$	62,142	$	45,708

(1)Includes undiscounted port take-or-pay commitments as agreed to in the fourth quarter of 2017 for 2018-2020. We have the right to terminate our commitments at any time in exchange for a buyout payment. These amounts are considered minimum payments on services. The per tonne loading charges reflect these advance payments.

(2)Includes undiscounted rail take-or-pay commitments as agreed to in January 2018 for 2018-2020. We have the right to terminate our commitments at any time in exchange for a buyout payment. If we do not meet the required portion of our future nominated tons, there would be incremental liquidated damages due under the agreement.

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Interest Expense

3 Months Ended

Mar. 31, 2018

Interest Costs Incurred [Abstract]

Interest Income And Interest Expense Disclosure[Text Block]

6. Interest Expense

Interest expense consisted of the following (in thousands):

			Three Months Ended
			March 31,
			2018		2017
Senior notes			$	6,461	$	7,986
Credit facility unutilized fee				701		1,183
Federal coal lease obligations imputed interest				68		86
Amortization of deferred financing costs and
	original issue discount			1,919		1,986
Other				39		89
		Subtotal		9,188		11,330
Premium on early retirement of debt				—		880
Write-off of deferred financing costs
	and original issue discount			—		702
	Total cost of early retirement of debt and refinancings			—		1,582
Net interest expense			$	9,188	$	12,912

In connection with the public offering discussed in Note 13, upon redemption of the 2019 Notes (defined in Note 13), we paid $1.5 million in accrued and unpaid interest, $0.9 million in premium on the early retirement of debt, and wrote off $0.7 million in deferred financing and original issue discount in the three months ended March 31,2017.

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure Abstract

Income Tax Disclosure [Text Block]

7. Income Taxes

TCJA made significant changes to U.S. tax laws. We have historically been subject to the Alternative Minimum Tax (“AMT”) under which taxes were imposed at a 20% rate on taxable income, subject to certain adjustments, and we assumed that we would be subject to the AMT rate in future periods. As such, the elimination of the AMT and reduction in the federal corporate tax rate to 21% does not have a material impact on our estimates for cash taxes payable in the next several years. The corporate rate reduction required a revaluation of our net deferred tax asset at December 31, 2017. However, since we had a full valuation allowance on our net deferred tax asset, there was no revaluation impact to our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

A material immediate impact of TCJA was the elimination of the AMT and the ability to offset our regular tax liability or claim refunds for taxable years 2018 through 2021 for our AMT credits carried forward from prior periods. We currently anticipate we will realize approximately $30 million in AMT value over the next four years with approximately half of this value realized in 2019 for taxable year 2018.

As of March 31,2018 and December 31, 2017, we had deferred tax assets principally arising from: AROs, postretirement benefits, contract rights, and net operating loss carry-forwards. As management cannot determine that it is more likely than not that we will realize the benefit of the deferred tax assets, a valuation allowance equal to the net deferred tax asset has been established.

Our statutory income tax rate including state income taxes, for the threemonths ended March 31,2018was approximately 23%, while the rate for the threemonths ended March 31,2017, was approximately 37%. Our effective tax rate for the threemonths ended March 31,2018and 2017was (0.8)% and (1.5)%, respectively. The difference between the statutory rates for each period is due to TCJA. In addition, the difference between our statutory income tax rate and our effective income tax rate for the threemonths ended March 31,2018and 2017is primarily the result of the impact of percentage depletion, income tax in the states in which we do business and changes in our valuation allowance.

As of March 31,2018and December 31, 2017, we had no uncertain tax positions that we expect to have a material impact on the financial statements as a result of tax deductions taken during the year or in prior periods or due to settlements with taxing authorities or lapses of applicable statues of limitations. We are open to federal and state tax audits until the applicable statutes of limitations expire. The statute of limitations has expired for all federal and state returns filed for periods ending before 2012.

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Equity Method Investments

3 Months Ended

Mar. 31, 2018

Equity Method Investments And Joint Ventures Abstract

Equity method investments

8. Equity Method Investments

Equity method investments include our 50% equity investment in Venture Fuels Partnership, a coal marketing company. We have received distributions of $1.0 million and $3.0 million from the Venture Fuels Partnership during the three months ended March 31,2018 and 2017, respectively. Our equity method investments are included in noncurrent Other assets on the Unaudited Condensed Consolidated Balance Sheetsand had a carrying amount of the following (in thousands):

	March 31,		December 31,
		2018		2017
Venture Fuels Partnership	$	3,041	$	3,774
Other		993		989
Total equity method investments	$	4,034	$	4,763

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Earnings (Loss) Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings (Loss) per Share

9. Earnings (Loss) per Share

Potential dilutive shares of common stock may include restricted stock and units, options, and performance units issued under our Long Term Incentive Plan (“LTIP”). See Note 16. We apply the treasury stock method to determine dilution from restricted stock and units, options, and performance units. On February 28, 2017, we issued 13.5 million shares of common stock through a registered underwritten public offering.

The following table summarizes the calculation of diluted earnings (loss) per share (in thousands, except per share amounts):

				Three Months Ended
			March 31,
			2018		2017
Numerator for calculation of diluted earnings (loss) per share:
		Net income (loss)	$	(7,738)	$	(20,108)
Denominator for basic income (loss) per share –
	weighted-average shares outstanding			75,329		66,132
Dilutive effect of stock equivalents				—		—
Denominator for diluted earnings (loss) per share				75,329		66,132
Basic earnings (loss) per share			$	(0.10)	$	(0.30)
Diluted earnings (loss) per share			$	(0.10)	$	(0.30)

For the periods presented, the following items were excluded from the diluted earnings (loss) per share calculation because they were anti-dilutive (in thousands):

	Three Months Ended
	March 31,
	2018	2017
Anti-dilutive stock equivalents	4,227	2,993

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2018

Fair Value of Financial Instruments

Fair Value of Financial Instruments

10. Fair Value of Financial Instruments

We use a three-level fair value hierarchy that categorizes assets and liabilities measured at fair value based on the observability of the inputs utilized in the valuation. The levels of the hierarchy, as defined below, give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.

• Level 1 is defined as observable inputs such as quoted prices in active markets for identical assets. Our Level 1 assets currently include money market funds.
• Level 2 is defined as observable inputs other than Level 1 prices, including quoted prices for similar assets or liabilities in an active market, quoted prices for identical assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Our Level 2 assets and liabilities include derivative financial instruments with fair values derived from quoted prices in over-the-counter markets or from prices received from direct broker quotes. We had no Level 2 assets or liabilities as of March 31,2018 or December 31, 2017.
• Level 3 is defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. We had no Level 3 financial instruments as of March 31,2018 or December 31, 2017.

The tables below set forth, by level, our financial assets and liabilities that are recorded at fair value in the accompanying Unaudited Condensed Consolidated Balance Sheets (in thousands):

		Fair Value as of March 31, 2018
		Level 1		Level 2		Total
Assets
	Money market funds (1)	$	64,283	$	—	$	64,283

			Fair Value as of December 31, 2017
		Level 1		Level 2		Total
Assets
	Money market funds (1)	$	49,102	$	—	$	49,102

(1) Included in Cash and cash equivalents in the Unaudited Condensed Consolidated Balance Sheets along with $63.5 million and $58.8million of demand deposits as of March 31,2018 and December 31, 2017, respectively.

We did not have any transfers between levels during the three months ended March 31,2018. Our policy is to value all transfers between levels using the beginning of period valuation.

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2018

Derivatives Financial Instruments

Derivatives Financial Instruments

11. Derivative Financial Instruments

WTI Derivatives

Historically, we have used derivative financial instruments, such as swaps, to help manage our exposure to market changes in diesel fuel prices. The derivatives were indexed to the West Texas Intermediate (“WTI”) crude oil price as quoted on the New York Mercantile Exchange. As such, the nature of the derivatives did not directly offset market changes to our diesel costs.

Under a swap agreement, if the monthly average index price is higher than the swap price, we receive the difference and if the monthly average index price is lower than the swap price, we pay the difference. We used swap agreements to fix our forecasted diesel costs for 2017. All swap agreements were settled as of December 31, 2017. We currently do not hold any swap agreements.

Derivative Gains and Losses

(Gain) loss on derivative financial instruments recognized in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) were as follows (in thousands):

	Three Months Ended
	March 31,
	2018		2017
WTI derivative financial instruments	$	—	$	2,344
Net derivative financial instruments loss (gain)	$	—	$	2,344

See Note 10 for a discussion related to the fair value of derivative financial instruments.

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Inventories, Net

3 Months Ended

Mar. 31, 2018

Inventories

Inventories

12. Inventories, Net

Inventories, net consisted of the following (in thousands):

	March 31,		December 31,
	2018		2017
Materials and supplies	$	69,903	$	68,461
Less: Obsolescence allowance		(1,059)		(1,094)
Material and supplies, net		68,844		67,367
Coal inventory		1,503		5,537
Inventories, net	$	70,347	$	72,904

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Senior Notes and Equity

3 Months Ended

Mar. 31, 2018

Senior Notes

Senior Notes

13. Senior Notes and Equity

On February 28, 2017, we issued 13.5 million shares of common stock through a registered underwritten public offering and received proceeds, net of underwriting discounts and commissions, of $64.7 million. We used the net proceeds from the offering to fund the full redemption of our outstanding8.50% Senior Notes due 2019(“2019 Notes”). On March 31, 2017, we redeemed the 2019 Notes at a total cost of $64.5million, reflecting a redemption price of 101.417% of the principal amount of $62.1million, or $63.0million, plus accrued and unpaid interest of $1.5 million. In addition, we wrote off $0.7 million in deferred financing costs and original issue discount as of the redemption date.

Senior notes consisted of the following (in thousands):

		March 31, 2018
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt		Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	350,679	$	12,654	$	(72,967)	$	290,366	$	307,062
6.375% senior notes due 2024		55,582		826		—		56,408		45,761
Total senior notes	$	406,261	$	13,480	$	(72,967)	$	346,774	$	352,823
		December 31, 2017
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt		Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	349,719	$	13,614	$	(72,967)	$	290,366	$	315,773
6.375% senior notes due 2024		55,547		861		—		56,408		45,973
Total senior notes	$	405,266	$	14,475	$	(72,967)	$	346,774	$	361,746

• The fair value of the senior notes was based on observable market inputs, which are considered Level 2 in the fair value hierarchy. See Note 10 for further information on Level 2 fair value measurements.

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Other Obligations

3 Months Ended

Mar. 31, 2018

Other Obligations

Other Obligations

14. Other Obligations

Capital Equipment Lease Obligations

From time to time, we enter into capital leases on equipment under various lease schedules, which are subject to a master lease agreement, and are pre-payable at our option. Our capital equipment lease obligations are included in Other liabilities. As of March 31,2018, future payments for these obligations are as follows (in thousands):

2018	$	1,882
2019		1,698
2020		856
2021		27
2022		—
Thereafter		—
Total		4,463
Less: interest		171
Total principal payments		4,292
Less: current portion		2,195
Capital equipment lease obligations, net of current portion	$	2,097

Federal Coal Lease Obligations

Our federal coal lease obligations, as reflected in the Unaudited Condensed Consolidated Balance Sheets, consist of obligations payable to the Bureau of Land Management of the U.S. Department of the Interior for the West Antelope II South lease modification. The future payments for our federal coal lease obligations are $0.6 million per year through 2022. The balance of our federal coal lease obligations is $1.8 million as of March 31, 2018.

Accounts Receivable Securitization Program

On January 31, 2017, the Accounts Receivable Securitization Program (“A/R Securitization Program”) was amended to extend the term of the A/R Securitization Program to January 23, 2020, allow for the ability to issue letters of credit, and reduce the maximum borrowing capacity for both cash and letters of credit from $75 million to $70 million.  All other terms of the program remained substantially the same.  The borrowing capacity under the A/R Securitization Program is reduced by the undrawn face amount of letters of credit issued and outstanding. As ofMarch 31,2018, we had $19.9million of borrowing capacity under the A/R Securitization Program, which was less than the undrawn face amount of letters of credit outstanding of$23.0 million. The $3.1 million difference between the borrowing capacity and the undrawn face amount of the letters of credit was cash-collateralized into a restricted cash account in early April 2018, thus bringing the available borrowing capacity to zero. As of December 31, 2017, there was a $1.1 million deficit between the borrowing capacity and the undrawn face amount of letters of credit, which was cash-collateralized into a restricted cash account in early January 2018. The restriction was lifted on the $1.1 million in early March 2018. There were no borrowings outstanding under the A/R Securitization Program as of March 31,2018 or December 31, 2017.

Credit Agreement

On February 21, 2014, Cloud Peak Energy Resources LLC entered into a five-year Credit Agreement with PNC Bank, National Association, as administrative agent, and a syndicate of lenders, which was amended on September 5, 2014 and September 9, 2016 (as amended, the “Credit Agreement”). The Credit Agreement provides us with a senior secured revolving credit facility with a capacity of up to $400 million that can be used to borrow funds or obtain letters of credit. The borrowing capacity under the Credit Agreement is reduced by the undrawn face amount of letters of credit issued and outstanding, which may be up to $250million at any time. As of March 31,2018and December 31, 2017, we hadno borrowings under the Credit Agreement. There were no longer any undrawn letters of credit under the Credit Agreement as the balance had been transferred to the A/R Securitization Program as of December 31, 2017. We were in compliance with the covenants contained in the Credit Agreement as of March 31,2018 and December 31, 2017.

Liquidity

Our aggregate availability for borrowing under the Credit Agreement and the A/R Securitization Program was approximately $400.0million as of March 31,2018. Our total liquidity, which includes cash and cash equivalents and amounts available under both our Credit Agreement and the A/R Securitization Program, was $527.8million as of March 31,2018.

Debt Issuance Costs

There were $3.4million and $4.4million of unamortized debt issuance costs as of March 31,2018 and December 31, 2017, respectively, related to the A/R Securitization Program and the Credit Agreement included in noncurrent Other assets.

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Postretirement Medical Plan

3 Months Ended

Mar. 31, 2018

Postretirement Medical Plan

Postretirement Medical Plan

15. Postretirement Medical Plan

We maintain an unfunded postretirement medical plan to provide certain postretirement medical benefits to eligible employees. Net periodic postretirement benefit costs included the following components (in thousands):

		Three Months Ended
		March 31,
		2018		2017
Service cost		$	197	$	223
Interest cost			220		230
Amortization of prior service cost (credit)			(1,837)		(1,821)
	Net periodic benefit cost (credit)	$	(1,420)	$	(1,368)

On January 1, 2018, we adopted ASU 2017-07, which requires separate presentation of service costs and all other components of net periodic benefit costs on the income statement. See Note 2 for further information regarding the impact of this ASU on our Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).

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Equity-Based Compensation

3 Months Ended

Mar. 31, 2018

Equity-Based Compensation

Equity-Based Compensation

16. Equity-Based Compensation

Our LTIP permits awards to our employees and eligible non-employee directors, which we generally grant in the first quarter of each year. The LTIP allows for the issuance of equity-based compensation in the form of restricted stock, restricted stock units, options, stock appreciation rights, dividend equivalent rights, performance awards, and share awards. As of March 31,2018, there were no remaining shares available for issuance under the LTIP. Our stockholders are being asked to approve an additional 3.0 million shares for issuance under the LTIP at our 2018 annual meeting on May 9, 2018.

Generally, each form of equity-based compensation awarded to eligible employees cliff vests on the third anniversary of the grant date, subject to meeting any applicable performance criteria for the award. However, the awards will pro-rata vest sooner if an employee terminates employment with or stops providing services to us because of death, “disability,” “redundancy” or “retirement” (as such terms are defined in the award agreement or the LTIP, as applicable), or if an employee subject to an employment agreement is terminated by us for any reason other than for “cause” or leaves for “good reason” (as such terms are defined in the relevant employment agreement). In addition, the awards will fully vest if an employee is terminated without cause (or leaves for good reason, if the employee is subject to an employment agreement) within two years after a “change in control” (as such term is defined in the LTIP) occurs.

The restricted stock units granted to our directors generally vest upon their resignation or retirement (except for a removal for cause) or upon certain events constituting a “change in control” (as such term is defined in the award agreement). They will pro-rata vest if a director resigns or retires within one year of the date of grant.

Restricted Stock Units

We have granted restricted stock units under the LTIP to eligible employees and non-employee directors. A summary of restricted stock unit award activity is as follows (in thousands, except per share amounts):

		Weighted-Average Grant-Date Fair Value
	Number of Shares
		(per share)
Non-vested units as of January 1, 2018	2,813	$	3.75
Granted	866	$	3.50
Vested	(324)	$	7.96
Non-vested units as of March 31, 2018	3,355	$	3.27

As of March 31,2018, unrecognized compensation cost related to restricted stock awards was $4.8 million, which will be recognized over a weighted-average period of 2.2 years prior to vesting, which is included within Additional paid-in capital in our Unaudited Condensed Consolidated Balance Sheets. These awards are ultimately delivered in common stock and are classified as equity awards.

Performance Share Units

Performance share units represent the right to receive a number of shares of common stock (or the equivalent cash value thereof) based on the achievement of targeted performance levels related to pre-established total stockholder return goals over a three-year period, and pay out may range from 0% to 200% of the targeted share number.

In most years, including 2018 and 2017, the performance-based units are expected to be settled in shares of common stock and the grant date fair value of the awards is calculated using a Monte Carlo simulation and amortized over the performance period. The 2016 grants are currently expected to be settled in cash upon any vesting in March 2019, and therefore, are accounted for as a liability award and are included withinAccrued expensesin the Unaudited Condensed Consolidated Balance Sheets and marked to market on a quarterly basis. If we were to have sufficient available shares under our LTIP as approved by our stockholders, the Compensation Committee could elect to settle the 2016 performance-based share units in shares of common stock.

The weighted-average grant date fair values of the performance share units granted during the three months ended March 31,2018 and the year ended December 31, 2017 were $4.05 and $5.85 per share, respectively. As of March 31,2018, $10.1million of unrecognized compensation cost, which represents the unvested portion of the fair market value of performance share units granted, is expected to be recognized over a weighted-average vesting period of 2.0 years.

A summary of performance share unit award activity is as follows (in thousands, except per share amounts):

		Weighted-Average Grant-Date Fair Value
	Number of Shares
		(per share)
Non-vested units as of January 1, 2018	3,685	$	4.08
Granted	1,153	$	4.05
Vested	(530)	$	9.66
Non-vested units as of March 31, 2018	4,308	$	3.38

The assumptions used to estimate the fair value of the performance-based share units granted on March 2, 2018 are as follows:

Risk-free interest rate		2.4	%
Expected volatility		62.3	%
Term (in years)		2.8
Fair value (per share)	$	4.05

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies

Commitments and Contingencies

17. Commitments and Contingencies

Commitments

Purchase Commitments⁽¹⁾

We had outstanding purchase commitments consisting of the following (in thousands):

		March 31,		December 31,
		2018		2017
Capital Commitments
	Equipment	$	6,818	$	4,191

(1)See Note 5 for information regarding Transportation Commitments.

Contingencies

Litigation

Administrative Appeals of the BLM’s Approval of the West Antelope II South Lease Modification 

Background—On February 1, 2, and 5, 2018, the Powder River Basin Resource Council (“PRBRC”), the Sierra Club, and WildEarth Guardians (“WildEarth”), respectively, filed separate appeals with the Interior Board of Land Appeals (“IBLA”) challenging the Deputy State Wyoming BLM Director’s November 11, 2017 decision, which was publicly noticed on Bureau of Land Management’s (“BLM”) website on January 5, 2018 (“2018 BLM Decision”), to approve Antelope Coal LLC’s (“Antelope Coal”) proposed modification of Antelope Coal’s West Antelope II South (“WAII South”) lease.  Antelope Coal is a 100% owned subsidiary of Cloud Peak Energy.  The 2018 BLM Decision that is the subject of all three appeals approves the proposed amendment of WAII South lease.  This lease modification, which was entered into on February 1, 2018, by BLM and Antelope Coal, adds coal underlying nearly 857 surface acres to Antelope Coal’s existing federal leases.  PRBRC, the Sierra Club, and WildEarth have asked the IBLA to vacate the 2018 BLM Decision and direct the BLM to prepare additional environmental analysis on the impacts of the lease modification.

The 2018 BLM Decision was issued after a previous August 15, 2014 decision (“2014 BLM Decision”) had been set aside by the IBLA following previous administrative appeals filed by PRBRC, WildEarth, and the Sierra Club. On February 7, 2017, the IBLA issued a decision setting aside the 2014 BLM Decision to issue the WAII South lease modification and remanding that decision to BLM on the narrow ground that the Wyoming High Plains District Manager lacked the appropriate delegation of authority to approve such a leasing decision. The IBLA specifically declined to address the merits of WildEarth’s and PRBRC’s claims challenging whether BLM’s underlying environmental analysis was sufficient to support the agency’s lease modification decision. On April 10, 2017, BLM filed a petition with the Director of the Department of Interior’s Office of Hearings and Appeals (the “OHA Director”) asking the OHA Director to reverse the IBLA’s February 7, 2017 decision and remand to the IBLA with instructions to decide the merits of the underlying WildEarth and PRBRC appeals. On September 11, 2017, after full briefing by the parties, the OHA Director denied BLM’s Petition for OHA Director Review thereby concluding the appeals and giving full force and effect to the IBLA’s February 7, 2017 order remanding the matter to BLM and providing BLM with broad discretion on how to proceed. Upon remand, the BLM reapproved the WAII South lease modification through the 2018 BLM Decision.

Intervention by Cloud Peak Energy and State of Wyoming—On February 16 and March 5, 2018, Antelope Coal and the State of Wyoming, respectively, moved to intervene in the PRBRC, WildEarth, and Sierra Club appeals as respondents to defend the 2018 BLM Decision. On April 10, 2018, the IBLA granted both motions to intervene.

Current Schedule.  On March 21, 2018, BLM filed a Motion to Dismiss the Sierra Club appeal due to the Sierra Club’s failure to file a Statement of Reasons by the briefing deadline. On February 27 and March 5, 2018, PRBRC and WildEarth, respectively, each filed a Statement of Reasons in their appeals. On March 29, March 30, and April 2, 2018, the State of Wyoming, BLM, and Antelope Coal, respectively, filed Answer briefs in the PRBRC appeal. On April 3, 5, and 9, 2018, the State of Wyoming, BLM, and Antelope Coal, respectively, filed Answer briefs in the WildEarth appeal. On April 11, 2018, PRBRC filed a reply brief and on April 12, 2018, BLM filed a clarification to PRBRC’s Reply Brief.

We believe the PRBRC, Sierra Club, and WildEarth appeals challenging the BLM’s West Antelope II South lease modification Decision Record are without merit. Nevertheless, if the appellants’ claims are successful, the timing and ability of Cloud Peak Energy to mine the coal underlying the lease modification surface acres could be materially adversely impacted. We are unable to estimate a loss or range of loss for this contingency because (1) the challenges do not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the IBLA has broad discretion in determining the nature of the relief ultimately granted.

WildEarth’s Regulatory Challenge to OSM’s Approval Process for Antelope Mine Plan

Background—On September 15, 2015, WildEarth filed a complaint in the Colorado District Court challenging the Department of Interior’s and Office of Surface Mining Reclamation and Enforcement’s (collectively, “OSM”) approvals of mine plans for four different coal mines, one of which is located in Colorado and three of which are located in Wyoming. The challenged approvals included one mine plan modification that was issued to Antelope Coal for the Antelope Mine in Wyoming.The plaintiff seeks to vacate existing, required regulatory approvals and to enjoin mining operations at Antelope Mine.

Intervention by Cloud Peak Energy and Others—In November and December of 2015, the State of Wyoming and all the operators of the mines whose mine plans are being challenged—Antelope Coal, New Mexico Coal Resources, LLC, Bowie Resources, LLC, and Thunder Basin Coal, L.L.C., moved to intervene as Defendants to defend the challenged mine plans. On February 18, 2016, the Colorado District Court granted all the parties’ intervention motions.

Current Schedule—On November 25, 2015, the OSM filed a motion to sever WildEarth’s complaint and transfer those claims against the two Wyoming mines (Antelope and Black Thunder) to the District of Wyoming and the New Mexico mine (El Segundo) to the District of New Mexico. Each of the prospective intervenors filed conditional responses in support of OSM’s transfer motion, and WildEarth filed an opposition to OSM’s transfer motion. On June 17, 2016, the Colorado District Court granted OSM’s motion to sever and transfer WildEarth’s claims against the Antelope and Black Thunder mine plans to the District of Wyoming and the El Segundo mine plan to the District of New Mexico. The challenges against the Antelope and Black Thunder mine plans, which are docketed as separate cases, have both been assigned to Judge Johnson of the District of Wyoming. Because Antelope Coal and Wyoming had each been granted intervention by the Colorado District Court, the Wyoming District Court acknowledged both parties as Intervenor-Defendants after WildEarth’s challenge to the Antelope Mine was transferred to the District of Wyoming. On October 7, 2016, OSM filed its administrative record for the case challenging the Antelope mine plan. On October 21, 2016, WildEarth filed a motion to supplement the administrative record with three administrative documents prepared by other federal agencies. On November 4, 2016, OSM and Antelope Coal each filed opposition briefs. On December 1, 2016, after full briefing, the court denied WildEarth’s motion to supplement the record. WildEarth filed its opening merits brief on January 27, 2017. Opposition briefs by OSM, Antelope Coal, and the State of Wyoming were filed April 5, 2017. On June 2, 2017, WildEarth filed its reply brief. On August 22, 2017 and September 20, 2017, WildEarth filed two separate notices of supplemental authority. OSM and Antelope Coal each filed responses to WildEarth’s first notice on September 6, 2017 and September 21, 2017, respectively. Antelope Coal and the State of Wyoming filed a joint response to WildEarth’s second notice on October 27, 2017. The merits briefing has been completed and the parties are awaiting a decision from the court.

We believe WildEarth’s challenge is without merit.  Nevertheless, if WildEarth’s claims against OSM’s approval of the Antelope mine plan modification are successful, any court order granting the requested relief could have a material adverse impact on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any required reductions or modifications to our mining activities. We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the court has broad discretion in determining the nature of the relief ultimately granted.

WildEarth’s Regulatory Challenge to OSM’s Approval Process for Spring Creek Mine Plan

Background—On June 8, 2017, WildEarth and the Montana Environmental Information Center (“MEIC”) filed a complaint in the Montana District Court challenging OSM’s re-approval of a mine plan modification that was issued to Cloud Peak Energy for the Spring Creek Mine in Montana. WildEarth and MEIC seek to vacate existing, required regulatory approvals and to enjoin mining operations at the Spring Creek Mine.

Intervention by Spring Creek Coal—On August 31, 2017, Spring Creek Coal LLC moved to intervene in the WildEarth and MEIC’s challenge to the mine plan. On September 26, 2017, the court granted Spring Creek Coal’s intervention motion.

Current Schedule— OSM answered the plaintiffs’ complaint on August 24, 2017.  OSM lodged the administrative record with the court and served the record on all parties on January 17, 2018.  Plaintiffs filed their motion for summary judgment on April 6, 2018. Federal Defendants response and cross motion for summary judgment is due May 11, 2018; and Spring Creek’s opposition and cross motion is due May 18, 2018.  Plaintiffs reply brief is due June 12, 2018 and the reply briefs for the Federal Defendants and Spring Creek are due July 2, 2018 and July 11, 2018, respectively. 

We believe WildEarth’s and MEIC’s challenge is without merit.  Nevertheless, if WildEarth’s and MEIC’s claims against OSM’s approval of the Spring Creek mine plan modification are successful, any court order granting the requested relief could have a material adverse impact on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any required reductions or modifications to our mining activities.  We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is to require the regulatory agency to address alleged deficiencies in complying with applicable regulatory and legal requirements and (3) even if the challenges are successful in whole or in part, the court has broad discretion in determining the nature of the relief ultimately granted.

California Climate Change Litigation

Background—On July 17, 2017, three California local governments filed separate but largely identical complaints in California Superior Court, naming numerous fossil fuel companies as defendants (together, the “California Climate Change Litigation”).  The Plaintiffs are the County of San Mateo, the County of Marin, and the City of Imperial Beach.  Defendants include Rio Tinto PLC, Rio Tinto LTD, Rio Tinto Energy America Inc., Rio Tinto Minerals Inc., Rio Tinto Services Inc., Chevron Corp., Chevron U.S.A. Inc., ExxonMobil Corp, BP P.L.C., BP America, Inc., Royal Dutch Shell Company LLC, Citgo Petroleum Corp., ConocoPhillips, ConocoPhillips Company, Phillips 66, Peabody Energy Corp., Total E&P USA Inc., Total Specialties USA Inc., Arch Coal, Inc., ENI S.p.A., ENI Oil & Gas Inc., Statoil ASA, Anadarko Petroleum Corp., Occidental Petroleum Corp., Repsol S.A., Repsol Energy North America Corp., Repsol Trading USA Corp., Marathon Oil Company, Marathon Oil Corporation, Marathon Petroleum Corp., Hess Corp., Devon Energy Corp., Devon Energy Production Company, L.P., Encana Corp., and Apache Corp.  Cloud Peak Energy is not a named defendant.

By way of summary only, Plaintiffs allege that defendants knowingly contributed to GHG emissions through the production and sale of fossil fuels that have adversely impacted the environment, thereby creating financial liabilities for the plaintiffs.  Plaintiffs also allege that defendants engaged in a coordinated effort to conceal and deny their own knowledge of those climate change threats, discredit scientific evidence and create doubt in the minds of customers, consumers, regulators, the media, journalists, teachers and the public about the consequences of the impacts of their fossil fuel pollution.  Based on these allegations, plaintiffs assert that defendants are liable under various causes of action including public nuisance, failure to warn, design defect, private nuisance, negligence, and trespass. Plaintiffs seek unspecified compensatory damages, equitable relief to abate the alleged nuisances, attorneys’ fees, punitive damages, disgorgement of profits, costs of suit and other relief as the court may deem proper.

Indemnity Sought From Cloud Peak Energy by Rio Tinto—In August 2017, Cloud Peak Energy received a notice from various Rio Tinto entities, including Rio Tinto Energy America Inc., Rio Tinto Minerals Inc., and Rio Tinto Services Inc., seeking indemnification from Cloud Peak Energy for liabilities in connection with the California Climate Change Litigation.  Cloud Peak Energy entered into various agreements with Rio Tinto and its affiliates in connection with the 2009 IPO and separation from Rio Tinto. Under the Master Separation Agreement, Cloud Peak Energy agreed to indemnify Rio Tinto for certain liabilities relating to Cloud Peak Energy’s business conducted prior to and after the closing of our separation from Rio Tinto, which may potentially include liabilities in connection with the California Climate Change Litigation. 

Current Schedule – On July 17, 2017, Plaintiffs filed their lawsuits in the Superior Court of the State of California for the County of San Mateo, the Superior Court of the State of California for the County of Marin, and the Superior Court for the County of Contra Costa, respectively.  On August 24, 2017, the cases were removed to the U.S. District Court for the Northern District of California, where they were deemed related and assigned to Judge Vince Chhabria.  Plaintiffs indicated that they intended to move to remand the cases back to state court, and the parties stipulated that Defendants would not be required to respond to the complaints until the Court ruled on the motion to remand. The Court signed that Stipulation and Order on September 22, 2017. On September 25, 2017, Plaintiffs filed their motion to remand. The Court granted Plaintiffs’ motion to remand on March 16, 2018.  On March 26, 2018, Defendants filed (1) a Notice of Appeal to the U.S. Court of Appeals for the Ninth Circuit relating to the District Court’s order granting remand, and (2) a motion to stay the remand order pending appeal.  On April 9, 2018, Judge Chhabria granted Defendants’ motion to stay the remand order pending appeal.  Defendants’ opening brief on appeal is due July 5, 2018;  Plaintiffs’ answering brief is due August 3, 2018; and Defendants’ reply brief is due August 24, 2018.

If the Plaintiffs were to prevail in the California Climate Change Litigation and if we are required to indemnify Rio Tinto for any portion of the resulting liabilities, those amounts could be significant and could have a material adverse impact on our financial condition, results and liquidity.  We are unable to estimate a loss or range of loss for this contingency because of the broad claims and unspecified damages alleged by the plaintiffs against a significant number of defendants and because of the early stage of the California Climate Change Litigation.

Challenge to BLM’s Approval of Revised Resource Management Plans for MT and WY

Background—On March 15, 2016, a group of environmental plaintiffs—Western Organization of Resource Councils, Montana Environmental Information Center, Powder River Basin Resource Council, Northern Plains Resource Council, Sierra Club, and Natural Resources Defense Council—filed a complaint in the U.S. District Court for Montana challenging the BLM’s September 2015 approval of the Miles City, MT and Buffalo, WY, revised Resource Management Plans (“RMPs”). The Plaintiffs seek to vacate the 2015 RMPs, require BLM to undertake supplemental environmental analysis under the National Environmental Policy Act (“NEPA”), and enjoin BLM and the federal defendants from approving any new leases or project permits for coal or oil and gas resources within the two planning areas until BLM prepares new NEPA analysis and revises its RMPs.

Intervention by Cloud Peak Energy and Others—In February, March, and April, 2017, Cloud Peak Energy, the State of Wyoming, and Peabody Caballo Mining, LLC and BTU Western Resources, Inc. (“Peabody”), respectively, moved to intervene in the case. The Court granted all the parties intervention motions in March (Cloud Peak) and April (Wyoming and Peabody), 2017.

Current Schedule—On March 26, 2018, the Court issued an Amended Opinion and Order (revising theCourt’s March 23, 2018 Order) granting the Plaintiffs’ Cross-Motion for Summary Judgment on three claims and granting Defendants’ and Defendant-Intervenors’ Cross-Motions for Summary Judgment on three claims. The Court held that BLM must prepare supplemental environmental impact statements for both the Miles City and Buffalo RMPs. The Court also directed BLM to incorporate the Court’s conclusions in any pending or future coal or oil and gas leases or permits in the Miles City and Buffalo planning areas until BLM completes the supplemental NEPA analysis for both RMPs. The Court further ordered the parties to meet and confer in good faith in an attempt to reach an agreement regarding the appropriate remedy. If the parties are unable to reach an agreement, the parties must submit separate briefs to the Court by May 26, 2018 recommending appropriate remedies in light of the Court’s March 26th Order. The Court will not enter final judgment in the case until after it reviews the parties’ briefs and issues a remedy order.

We believe the Plaintiffs’ challenge is without merit. Nevertheless, if Plaintiffs are successful in obtaining their requested remedies, the timing and ability of Cloud Peak Energy to obtain leases and permit approvals could be materially adversely impacted. We are unable to estimate a loss or range of loss for this contingency because (1) the challenge does not seek monetary relief, (2) the nature of the relief sought is broad and the only relief the Court has ordered to date would require BLM to prospectively address alleged deficiencies in complying with applicable legal and regulatory requirements, and (3) it is not clear at this point whether the Court will issue any injunctive relief that might adversely affect Cloud Peak Energy’s leases and permit approvals.

Other Legal Proceedings

We are involved in other legal proceedings arising in the ordinary course of business and may become involved in additional proceedings from time to time. We believe that there are no other legal proceedings pending that are likely to have a material adverse effect on our consolidated financial condition, results of operations or cash flows. Nevertheless, we cannot predict the impact of future developments affecting our claims and lawsuits, and any resolution of a claim or lawsuit or an accrual within a particular fiscal period may materially and adversely impact our results of operations for that period. In addition to claims and lawsuits against us, our leases by application, leases by modification, permits, and other industry regulatory processes and approvals, including those applicable to the utility and coal logistics and transportation industries, may also continue to be subject to legal challenges that could materially and adversely impact our mining operations, results and liquidity. These regulatory challenges may seek to vacate prior regulatory decisions and authorizations that are legally required for some or all of our current or planned mining activities. If we are required to reduce or modify our mining activities as a result of these challenges, the impact could have a material adverse effect on our shipments, financial results and liquidity, and could result in claims from third parties if we are unable to meet our commitments under pre-existing commercial agreements as a result of any such required reductions or modifications to our mining activities.

Tax Contingencies

Our income tax calculations are based on application of the respective U.S. federal or state tax laws. Our tax filings, however, are subject to audit by the respective tax authorities. Accordingly, we recognize tax benefits when it is more likely than not a position will be upheld by the tax authorities. To the extent the final tax liabilities are different from the amounts originally accrued, the increases or decreases are recorded as income tax expense.

Several non-income based production tax audits related to federal and state royalties and severance taxes are currently in progress. The financial statements reflect our best estimate of taxes and related interest and penalties due for potential adjustments that may result from the resolution of such tax audits. From time to time, we receive audit assessments and engage in settlement discussions with applicable tax authorities, which may result in adjustments to our estimates of taxes and related interest and penalties.

Concentrations of Risk and Major Customers

For the three months ended March 31,2018, there was no single customer that represented 10% or more of consolidated revenue. For the three months ended March 31,2017, there was one customer that represented 10% or more of consolidated revenue.We generally do not require collateral or other security on accounts receivable because our customers are comprised primarily of investment grade electric utilities. Credit risk is controlled through credit approvals and monitoring procedures.

Guarantees and Off-Balance Sheet Risk

In the normal course of business, we are party to guarantees and financial instruments with off-balance sheet risk, such as bank letters of credit, performance or surety bonds and indemnities, which are not reflected on the Unaudited Condensed Consolidated Balance Sheets. In our past experience, virtually no claims have been made against these financial instruments. Management does not expect any material losses to result from these guarantees or off-balance sheet instruments.

U.S. federal and state laws require we secure certain of our obligations to reclaim lands used for mining and to secure coal lease obligations. The primary method we have used to meet these reclamation obligations and to secure coal lease obligations is to provide a third-party surety bond, typically through an insurance company. Specific bond amounts may change over time, depending on the activity at the respective site and any specific requirements by federal or state laws. We also previously used self-bonding to secure performance of certain obligations in Wyoming. In January 2017, we received approval to remove the final $10 million of self-bonding that existed as of December 31, 2016 and exited self-bonding during the first quarter of 2017. As of March 31,2018, we had $413.6million of reclamation and lease bonds backed by collateral of $23.0 million in the form of letters of credit under our A/R Securitization Program used for mining, securing coal lease obligations, and for other operating requirements. As of March 31,2018, we have reduced the undrawn face amount of all letters of credit by a total of $44.5 million from March 31,2017.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

18. Accumulated Other Comprehensive Income (Loss)

The changes in Accumulated other comprehensive income (loss) (“AOCI”) related to our postretirement medical plan by component, net of tax are as follows (in thousands):

			Three Months Ended
			March 31,
			2018		2017
Beginning balance, January 1,			$	13,807	$	21,884
	Other comprehensive income (loss) before reclassifications			(422)		―
	Amounts reclassified from accumulated
		other comprehensive income (loss)		(1,415)		(1,821)
	Net current period other comprehensive income (loss)			(1,837)		(1,821)
Ending balance, March 31,			$	11,969	$	20,063

The reclassifications out of AOCI are as follows (in thousands):

	Three Months Ended
	March 31,
	2018		2017
Postretirement Medical Plan (1)
Amortization of prior service costs (credits), before tax(2)	$	(1,837)	$	(1,821)
Tax expense (benefit)		422		―
Amounts reclassified from AOCI	$	(1,415)	$	(1,821)

(1) See Note 15 for the components of our net periodic postretirement benefit costs.

(2) Presented on the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). The balances disclosed for the three months ended March 31,2017 were previously included in Cost of product sold and Selling, general, and administrative expenses, respectively. See Note 2 for information regarding ASU 2017-07, which we adopted on January 1, 2018.

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Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Cash Flow Supplemental Disclosures [Text Block]

19. Supplemental Cash Flow Information

Restricted Cash

The following table provides a reconciliation of Cash andcash equivalents and restricted cash reported in the Unaudited Condensed Consolidated Balance Sheets as of March 31, 2018 and 2017, that sum to the total of such amounts in the Unaudited Condensed Consolidated Statements of Cash Flows:

	March 31,
	2018		2017
Cash and cash equivalents	$	127,796	$	100,515
Restricted cash in other current assets		725		725
Total cash, cash equivalents, and restricted cash shown in the
statement of cash flows	$	128,521	$	101,240

Other Cash Flow Information

	Three Months Ended
	March 31,
	2018		2017
Supplemental cash flow disclosures:
Interest paid	$	2,835	$	4,893
Income taxes paid (refunded)	$	(24)	$	(257)
Supplemental non-cash investing and financing activities:
Capital expenditures included in accounts payable	$	851	$	869
Assets acquired under federal coal lease	$	2,356	$	—

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Supplemental Guarantor/Non-Guarantor Financial Information

3 Months Ended

Mar. 31, 2018

Supplemental Guarantor/Non-Guarantor Financial Information

Supplemental Guarantor/Non-Guarantor Financial Information

20. Supplemental Guarantor/Non-Guarantor Financial Information

In accordance with the indentures governing the senior notes outstanding as of March 31,2018, CPE Inc. and certain of our 100% owned U.S. subsidiaries (the “Guarantor Subsidiaries”) have fully and unconditionally guaranteed the senior notes on a joint and several basis. These guarantees of either series of senior notes are subject to release in the following customary circumstances:

• a sale or other disposition (including by way of consolidation or merger or otherwise) of the Guarantor Subsidiary or the sale or other disposition of all or substantially all the assets of the Guarantor Subsidiary (other than to CPE Inc. or a Restricted Subsidiary (as defined in the applicable indenture) of CPE Inc.) otherwise not in violation of the applicable indenture;
• a disposition of the majority of the capital stock of a Guarantor Subsidiary to a third person otherwise not in violation of the applicable indenture, after which the applicable Guarantor Subsidiary is no longer a Restricted Subsidiary;
• upon a liquidation or dissolution of a Guarantor Subsidiary so long as no default under the applicable indenture occurs as a result thereof;
• the designation in accordance with the applicable indenture of the Guarantor Subsidiary as an Unrestricted Subsidiary or the Guarantor Subsidiary otherwise ceases to be a Restricted Subsidiary of CPE Inc. in accordance with the applicable indenture;
• defeasance or discharge of such series of senior notes;
• the release, other than the discharge through payment by the Guarantor Subsidiary, of all other guarantees by such Restricted Subsidiary of Debt (as defined in the applicable indenture) of either issuer of the senior notes or the debt of another Guarantor Subsidiary under the Credit Agreement; or
• in the case of the indenture for the 12% Second Lien Senior Notes due 2021, as set forth in the First Lien/Second Lien Intercreditor Agreement, dated October 17, 2016, among Cloud Peak Energy Resources LLC, Cloud Peak Energy Finance Corp., PNC Bank, National Association, as Senior Representative for the First Lien Credit Agreement Secured Parties and Wilmington Trust, National Association, as the Second Priority Representative for the Second Lien Indenture Secured Parties.

The following historical financial statement information is provided for CPE Inc. and the Guarantor/Non-Guarantor Subsidiaries:

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
		(in thousands)
			Three Months Ended March 31, 2018
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue			$	1,789	$	―	$	216,309	$	―	$	(1,789)	$	216,309
Costs and expenses
	Cost of product sold (exclusive of
		depreciation, depletion, and accretion)		―		4		192,529		1		―		192,534
	Depreciation and depletion			―		270		14,726		―		―		14,996
	Accretion			―		―		1,706		―		―		1,706
	Selling, general and administrative expenses			―		9,107		―		―		(1,789)		7,318
	Other operating costs			―		―		126		―		―		126
Total costs and expenses				―		9,381		209,087		1		(1,789)		216,680
Operating income (loss)				1,789		(9,381)		7,222		(1)		―		(371)
Other income (expense)
	Net periodic postretirement benefit income
	(cost), excluding service cost			―		268		1,349		―		―		1,617
	Interest income			2		261		―		―		―		263
	Interest expense			―		(8,862)		(108)		(218)		―		(9,188)
	Other, net			―		(147)		(268)		147		―		(268)
Total other income (expense)				2		(8,480)		973		(71)		―		(7,576)
Income (loss) before income tax provision and
	earnings from unconsolidated affiliates			1,791		(17,861)		8,195		(72)		―		(7,947)
	Income tax benefit (expense)			(63)		―		―		―		―		(63)
	Income (loss) from unconsolidated affiliates,
		net of tax		―		6		266		―		―		272
	Income (loss) from consolidated
		affiliates, net of tax		(9,467)		8,389		(72)		―		1,150		―
Net income (loss)				(7,738)		(9,467)		8,389		(72)		1,150		(7,738)
Other comprehensive income (loss)
	Postretirement medical plan amortization
		of prior service cost		(1,837)		(1,837)		(1,837)		―		3,674		(1,837)
	Income tax on postretirement medical plan
		and pension changes		―		―		―		―		―		―
Other comprehensive income (loss)				(1,837)		(1,837)		(1,837)		―		3,674		(1,837)
Total comprehensive income (loss)			$	(9,575)	$	(11,304)	$	6,552	$	(72)	$	4,824	$	(9,575)

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
		(in thousands)
			Three Months Ended March 31, 2017
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue			$	1,806	$	―	$	195,728	$	―	$	(1,806)	$	195,728
Costs and expenses
	Cost of product sold (exclusive of
		depreciation, depletion, and accretion)		―		―		170,269		―		―		170,269
	Depreciation and depletion			―		193		18,452		―		―		18,645
	Accretion			―		―		1,821		―		―		1,821
	(Gain) loss on derivative financial instruments			―		―		2,344		―		―		2,344
	Selling, general and administrative expenses			―		12,782		―		―		(1,806)		10,976
	Debt restructuring costs			―		40		―		―		―		40
	Other operating costs			―		―		176		―		―		176
Total costs and expenses				―		13,015		193,062		―		(1,806)		204,271
Operating income (loss)				1,806		(13,015)		2,666		―		―		(8,543)
Other income (expense)
	Net periodic postretirement benefit income
	(cost), excluding service cost			―		262		1,330		―		―		1,592
	Interest income			1		38		―		―		―		39
	Interest expense			(41)		(12,548)		(134)		(189)		―		(12,912)
	Other, net			―		(60)		(310)		60		―		(310)
Total other income (expense)				(40)		(12,308)		886		(129)		―		(11,591)
Income (loss) before income tax provision and
	earnings from unconsolidated affiliates			1,766		(25,323)		3,552		(129)		―		(20,134)
	Income tax benefit (expense)			(300)		―		―		―		―		(300)
	Income (loss) from unconsolidated affiliates,
		net of tax		―		2		324		―		―		326
	Income (loss) from consolidated
		affiliates, net of tax		(21,574)		3,745		(129)		―		17,958		―
Net income (loss)				(20,108)		(21,576)		3,747		(129)		17,958		(20,108)
Other comprehensive income (loss)
	Postretirement medical plan amortization
		of prior service cost		(1,821)		(1,821)		(1,821)		―		3,642		(1,821)
	Income tax on postretirement medical plan
		and pension changes		―		―		―		―		―		―
Other comprehensive income (loss)				(1,821)		(1,821)		(1,821)		―		3,642		(1,821)
Total comprehensive income (loss)			$	(21,929)	$	(23,397)	$	1,926	$	(129)	$	21,600	$	(21,929)

Supplemental Condensed Consolidating Balance Sheet
(in thousands)
			March 31, 2018
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets
	Cash and cash equivalents		$	—	$	127,684	$	112	$	—	$	—	$	127,796
	Accounts receivable			—		—		20,541		24,484		—		45,025
	Due from related parties			—		69,760		2,065		—		(71,825)		—
	Inventories, net			—		—		70,347		—		—		70,347
	Income tax receivable			232		—		—		—		—		232
	Other prepaid and deferred charges			85		—		23,684		—		—		23,769
	Other assets			—		—		802		—		—		802
		Total current assets		317		197,444		117,551		24,484		(71,825)		267,971
Noncurrent assets
	Property, plant and equipment, net			—		3,240		1,351,759		—		—		1,354,999
	Goodwill			—		—		2,280		—		—		2,280
	Income tax receivable			29,454		—		—		—		—		29,454
	Other assets			1,032,742		1,248,668		37,710		299		(2,284,988)		34,431
		Total assets	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813)	$	1,689,135
LIABILITIES AND MEMBER'S EQUITY
Current liabilities
	Accounts payable		$	2	$	25	$	25,503	$	60	$	—	$	25,590
	Royalties and production taxes			—		—		54,775		—		—		54,775
	Accrued expenses			8,812		10,301		18,806		—		—		37,919
	Due to related parties			54,866		71		—		16,959		(71,825)		71
	Current portion of federal coal lease
		obligations		—		—		379		—		—		379
	Other liabilities			—		—		2,195		—		—		2,195
		Total current liabilities		63,680		10,397		101,658		17,019		(71,825)		120,929
Noncurrent liabilities
	Senior notes			—		406,261		—		—		—		406,261
	Federal coal lease obligations, net of
		current portion		—		—		1,404		—		—		1,404
	Asset retirement obligations, net of
		current portion		—		—		100,817		—		—		100,817
	Accumulated postretirement medical benefit
		obligation, net of current portion		—		—		25,303		—		—		25,303
	Royalties and production taxes			—		—		28,592		—		—		28,592
	Other liabilities			—		—		6,996		—		—		6,996
		Total liabilities		63,680		416,658		264,770		17,019		(71,825)		690,302
Commitments and Contingencies (Note 17)				—		—		—		—		—
		Total equity		998,833		1,032,694		1,244,530		7,764		(2,284,988)		998,833
		Total liabilities and equity	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813)	$	1,689,135

Supplemental Condensed Consolidating Balance Sheet
(in thousands)
			December 31, 2017
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets
	Cash and cash equivalents		$	—	$	107,818	$	130	$	—	$	—	$	107,948
	Accounts receivable			—		—		17,359		32,716		—		50,075
	Due from related parties			—		46,350		23,044		—		(69,272)		122
	Inventories, net			—		—		72,904		—		—		72,904
	Income tax receivable			256		—		—		—		—		256
	Other prepaid and deferred charges			283		—		36,681		—		—		36,964
	Other assets			—		—		1,765		—		—		1,765
		Total current assets		539		154,168		151,883		32,716		(69,272)		270,034
Noncurrent assets
	Property, plant and equipment, net			—		3,480		1,362,275		—		—		1,365,755
	Goodwill			—		—		2,280		—		—		2,280
	Income tax receivable			29,454		—		—		—		—		29,454
	Other assets			1,036,162		1,289,487		33,612		341		(2,328,424)		31,178
		Total assets	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696)	$	1,698,701
LIABILITIES AND MEMBER'S EQUITY
Current liabilities
	Accounts payable		$	1	$	24	$	29,748	$	59	$	—	$	29,832
	Royalties and production taxes			—		—		54,327		—		—		54,327
	Accrued expenses			3,160		5,659		23,999		—		—		32,818
	Due to related parties			44,039		71		—		25,162		(69,272)		—
	Other liabilities			—		—		2,435		—		—		2,435
		Total current liabilities		47,200		5,754		110,509		25,221		(69,272)		119,412
Noncurrent liabilities
	Senior notes			—		405,266		—		—		—		405,266
	Asset retirement obligations, net of
		current portion		—		—		99,297		—		—		99,297
	Accumulated postretirement medical benefit
		obligation, net of current portion		—		—		24,958		—		—		24,958
	Royalties and production taxes			—		—		21,896		—		—		21,896
	Other liabilities			11,146		—		8,917		—		—		20,063
		Total liabilities		58,346		411,020		265,577		25,221		(69,272)		690,892
Commitments and Contingencies (Note 17)				—		—		—		—		—
		Total equity		1,007,809		1,036,115		1,284,473		7,836		(2,328,424)		1,007,809
		Total liabilities and equity	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696)	$	1,698,701

Supplemental Condensed Consolidating Statement of Cash Flows
(in thousands)
		Three Months Ended March 31, 2018
		Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net cash provided by (used in) operating
	activities	$	—	$	19,898	$	4,178	$	—	$	—	$	24,076
Investing activities
	Purchases of property, plant and equipment		—		(31)		(2,615)		—		—		(2,646)
	Investment in development projects		—		—		(360)		—		—		(360)
Net cash provided by (used in) investing
	activities		—		(31)		(2,975)		—		—		(3,006)
Financing activities
	Principal payments of federal coal leases		—		—		(574)		—		—		(574)
	Other		—		—		(648)		—		—		(648)
Net cash provided by (used in) financing
	activities		—		—		(1,222)		—		—		(1,222)
Net increase (decrease) in cash,
	cash equivalents, and restricted cash		—		19,867		(19)		—		—		19,848
Cash, cash equivalents, and restricted cash
	at beginning of period		—		107,818		856		—		—		108,673
Cash, cash equivalents, and restricted cash
	at the end of period	$	—	$	127,684	$	836	$	—	$	—	$	128,521

Supplemental Condensed Consolidating Statement of Cash Flows
(in thousands)
		Three Months Ended March 31, 2017
		Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net cash provided by (used in) operating
	activities	$	—	$	14,437	$	4,856	$	402	$	—	$	19,695
Investing activities
	Purchases of property, plant and equipment		—		(386)		(3,738)		—		—		(4,124)
Net cash provided by (used in) investing
	activities		—		(386)		(3,738)		—		—		(4,124)
Financing activities
	Repayment of senior notes		—		(62,094)		—		—		—		(62,094)
	Payment of debt refinancing costs		—		—		—		(402)		—		(402)
	Payment of debt restructuring costs		—		(40)		—		—		—		(40)
	Proceeds from issuance of common stock		—		68,850		—		—		—		68,850
	Cash paid for equity offering		—		(4,434)		—		—		—		(4,434)
	Other		—		—		(644)		—		—		(644)
Net cash provided by (used in) financing
	activities		—		2,282		(644)		(402)		—		1,236
Net increase (decrease) in cash,
	cash equivalents, and restricted cash		—		16,333		474		—		—		16,807
Cash, cash equivalents, and restricted cash
	at beginning of period		—		83,673		760		—		—		84,433
Cash, cash equivalents, and restricted cash
	at the end of period	$	—	$	100,006	$	1,234	$	—	$	—	$	101,240

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Accounting Policies and Standards Update (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Standards Update 2014-09 [Member]

New Accounting Pronouncements Or Change In Accounting Principle [Line Items]

Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Table Text Block]

	Balance as of December 31, 2017		Adjustment Due to ASC 606		Balance as of January 1, 2018
Assets
Accounts receivable	$	50,075	$	781	$	50,856
Inventories, net	$	72,904	$	(660)	$	72,244
Equity
Retained Earnings	$	347,046	$	121	$	347,167

Accounting Standards Update 2017-07 [Member]

New Accounting Pronouncements Or Change In Accounting Principle [Line Items]

Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Table Text Block]

	Three Months Ended
	March 31, 2017
	Previously Reported		Adjustment		As Revised
Cost of product sold	$	168,939	$	1,330	$	170,269
Selling, general and administrative expenses	$	10,714	$	262	$	10,976
Operating income (loss)	$	(6,951)	$	(1,592)	$	(8,543)
Net periodic postretirement benefit income (cost),
excluding service cost	$	―	$	1,592	$	1,592
Total other income (expense)	$	(13,183)	$	1,592	$	(11,591)

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Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Revenue Initial Application Period Cumulative Effect Transition [Table Text Block]

	Three Months Ended
	March 31, 2018
		As Reported		Balances Without the Adoption of ASC 606		Effect of ChangeHigher(Lower)
Revenue		$	216,309	$	217,091	$	(781)
Cost of product sold		$	192,534	$	193,194	$	(660)
Net income (loss)		$	(7,738)	$	(7,617)	$	(121)
Income (loss) per common share:
Basic		$	(0.10)	$	(0.10)	$	—
Diluted		$	(0.10)	$	(0.10)	$	—

	March 31, 2018
		As Reported		Balances Without the Adoption of ASC 606		Effect of Change Higher (Lower)
Accounts receivable		$	45,025	$	45,025	$	—
Inventories, net		$	70,347	$	70,347	$	—
Retained earnings		$	339,429	$	339,429	$	—

Disaggregation Of Revenue [Table Text Block]

	Three Months Ended
	March 31,
	2018		2017
United States (1)	$	138,232	$	170,866
South Korea (2)		66,021		16,961
Other (2)		12,056		7,901
Total revenue from external customers	$	216,309	$	195,728

(1)The majority of our domestic revenue is attributable to the Owned and Operated segment.

(2)All South Korean revenue and the majority of Other geographical revenue is attributable to our Logistics and Related Activities segment.

Contract With Customer Asset And Liability [Table Text Block]

	March 31,		December 31,
	2018		2017
Trade accounts receivable	$	44,606	$	47,872
Other receivables		419		2,203
Accounts receivable	$	45,025	$	50,075

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Information

Schedule of revenue

	Three Months Ended
	March 31,
		2018		2017
Owned and Operated Mines	$	153,653	$	173,611
Logistics and Related Activities		79,636		28,248
Other		3		1,293
Eliminations		(16,983)		(7,424)
Consolidated	$	216,309	$	195,728

Capital Expenditures

	Three Months Ended
	March 31,
		2018		2017
Owned and Operated Mines	$	6,182	$	4,596
Logistics and Related Activities		—		—
Other		31		397
Consolidated	$	6,213	$	4,993

Summary of Adjusted EBITDA

			Three Months Ended
			March 31,
			2018		2017
Adjusted EBITDA
Owned and Operated Mines			$	18,616	$	33,738
Logistics and Related Activities				7,098		(2,564)
Total Adjusted EBITDA for reportable segments				25,714		31,174
Unallocated net expenses				(6,072)		(10,744)
Adjustments to Income (loss) before income tax provision
	and earnings from unconsolidated affiliates
Depreciation and depletion				(14,996)		(18,645)
Accretion				(1,706)		(1,821)
Debt restructuring costs				—		(40)
	Derivative financial instruments:
		Gain (loss) on derivative financial instruments (1)		—		(2,344)
		Inclusion of cash amounts (received) paid (2)		—		336
Total derivative financial instruments				—		(2,008)
Interest expense, net				(8,925)		(12,873)
(Income) loss from unconsolidated affiliates, net of tax				(272)		(326)
Non-cash throughput amortization expense and
	contract termination payments			(1,690)		(4,851)
Income (loss) before income tax provision and earnings from
	unconsolidated affiliates		$	(7,947)	$	(20,134)

• (Gain) loss on derivative financial instruments reflected in the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).
• Cash amounts received and paid reflected within operating cash flows in the Unaudited Condensed Consolidated Statements of Cash Flows.

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Transportation Agreements (Tables)

3 Months Ended

Mar. 31, 2018

Transportation agreements

Unrecorded Unconditional Purchase Obligation [Line Items]

Transportation agreements

		March 31,		December 31,
		2018		2017
Services
	Transportation agreements (1) (2)	$	62,142	$	45,708

(1)Includes undiscounted port take-or-pay commitments as agreed to in the fourth quarter of 2017 for 2018-2020. We have the right to terminate our commitments at any time in exchange for a buyout payment. These amounts are considered minimum payments on services. The per tonne loading charges reflect these advance payments.

(2)Includes undiscounted rail take-or-pay commitments as agreed to in January 2018 for 2018-2020. We have the right to terminate our commitments at any time in exchange for a buyout payment. If we do not meet the required portion of our future nominated tons, there would be incremental liquidated damages due under the agreement.

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Interest Expense (Tables)

3 Months Ended

Mar. 31, 2018

Interest Costs Incurred [Abstract]

Interest Expense

			Three Months Ended
			March 31,
			2018		2017
Senior notes			$	6,461	$	7,986
Credit facility unutilized fee				701		1,183
Federal coal lease obligations imputed interest				68		86
Amortization of deferred financing costs and
	original issue discount			1,919		1,986
Other				39		89
		Subtotal		9,188		11,330
Premium on early retirement of debt				—		880
Write-off of deferred financing costs
	and original issue discount			—		702
	Total cost of early retirement of debt and refinancings			—		1,582
Net interest expense			$	9,188	$	12,912

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Equity Method Investments (Tables)

3 Months Ended

Mar. 31, 2018

Equity Method Investments And Joint Ventures Abstract

Equity method investments table

	March 31,		December 31,
		2018		2017
Venture Fuels Partnership	$	3,041	$	3,774
Other		993		989
Total equity method investments	$	4,034	$	4,763

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Earnings (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Summary of calculation of diluted earnings (loss) per share

				Three Months Ended
			March 31,
			2018		2017
Numerator for calculation of diluted earnings (loss) per share:
		Net income (loss)	$	(7,738)	$	(20,108)
Denominator for basic income (loss) per share –
	weighted-average shares outstanding			75,329		66,132
Dilutive effect of stock equivalents				—		—
Denominator for diluted earnings (loss) per share				75,329		66,132
Basic earnings (loss) per share			$	(0.10)	$	(0.30)
Diluted earnings (loss) per share			$	(0.10)	$	(0.30)

Schedule of anti-dilutive securities excluded from diluted earnings (loss) per share calculation

	Three Months Ended
	March 31,
	2018	2017
Anti-dilutive stock equivalents	4,227	2,993

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value of Financial Instruments

Schedule of fair value of financial assets and liabilities by level

		Fair Value as of March 31, 2018
		Level 1		Level 2		Total
Assets
	Money market funds (1)	$	64,283	$	—	$	64,283

			Fair Value as of December 31, 2017
		Level 1		Level 2		Total
Assets
	Money market funds (1)	$	49,102	$	—	$	49,102

(1) Included in Cash and cash equivalents in the Unaudited Condensed Consolidated Balance Sheets along with $63.5 million and $58.8million of demand deposits as of March 31,2018 and December 31, 2017, respectively.

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Derivatives Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative [Line Items]

Schedule of derivative mark-to-market (gains) and losses recognized in the consolidated statement of operations and comprehensive income

	Three Months Ended
	March 31,
	2018		2017
WTI derivative financial instruments	$	—	$	2,344
Net derivative financial instruments loss (gain)	$	—	$	2,344

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Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventories

Schedule of inventories, net

	March 31,		December 31,
	2018		2017
Materials and supplies	$	69,903	$	68,461
Less: Obsolescence allowance		(1,059)		(1,094)
Material and supplies, net		68,844		67,367
Coal inventory		1,503		5,537
Inventories, net	$	70,347	$	72,904

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Senior Notes and Equity (Tables)

3 Months Ended

Mar. 31, 2018

Senior Notes

Schedule of senior notes

		March 31, 2018
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt		Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	350,679	$	12,654	$	(72,967)	$	290,366	$	307,062
6.375% senior notes due 2024		55,582		826		—		56,408		45,761
Total senior notes	$	406,261	$	13,480	$	(72,967)	$	346,774	$	352,823
		December 31, 2017
	Carrying Value		Unamortized Discount and Debt Issuance Costs		Unamortized Deferred Gain on Forgiven Debt		Principal		Fair Value (1)
12.00% second lien senior notes due 2021	$	349,719	$	13,614	$	(72,967)	$	290,366	$	315,773
6.375% senior notes due 2024		55,547		861		—		56,408		45,973
Total senior notes	$	405,266	$	14,475	$	(72,967)	$	346,774	$	361,746

• The fair value of the senior notes was based on observable market inputs, which are considered Level 2 in the fair value hierarchy. See Note 10 for further information on Level 2 fair value measurements.

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Other Obligations (Tables)

3 Months Ended

Mar. 31, 2018

Other Obligations

Schedule of future payments on capital equipment lease obligations

2018	$	1,882
2019		1,698
2020		856
2021		27
2022		—
Thereafter		—
Total		4,463
Less: interest		171
Total principal payments		4,292
Less: current portion		2,195
Capital equipment lease obligations, net of current portion	$	2,097

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Postretirement Medical Plan (Tables)

3 Months Ended

Mar. 31, 2018

Postretirement Medical Plan

Schedule of components of net periodic postretirement benefit cost

		Three Months Ended
		March 31,
		2018		2017
Service cost		$	197	$	223
Interest cost			220		230
Amortization of prior service cost (credit)			(1,837)		(1,821)
	Net periodic benefit cost (credit)	$	(1,420)	$	(1,368)

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Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Equity-Based Compensation

Summary of restricted stock and restricted stock unit award activity

		Weighted-Average Grant-Date Fair Value
	Number of Shares
		(per share)
Non-vested units as of January 1, 2018	2,813	$	3.75
Granted	866	$	3.50
Vested	(324)	$	7.96
Non-vested units as of March 31, 2018	3,355	$	3.27

Summary of performance based share unit awards activity

		Weighted-Average Grant-Date Fair Value
	Number of Shares
		(per share)
Non-vested units as of January 1, 2018	3,685	$	4.08
Granted	1,153	$	4.05
Vested	(530)	$	9.66
Non-vested units as of March 31, 2018	4,308	$	3.38

Assumptions Estimate fair value

Risk-free interest rate		2.4	%
Expected volatility		62.3	%
Term (in years)		2.8
Fair value (per share)	$	4.05

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Capital supplies and services commitments

Unrecorded Unconditional Purchase Obligation [Line Items]

Schedule of outstanding purchase commitments

		March 31,		December 31,
		2018		2017
Capital Commitments
	Equipment	$	6,818	$	4,191

(1)See Note 5 for information regarding Transportation Commitments.

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss)

Schedule of changes in Accumulated Other Comprehensive Income (Loss) (AOCI) by component, net of tax

			Three Months Ended
			March 31,
			2018		2017
Beginning balance, January 1,			$	13,807	$	21,884
	Other comprehensive income (loss) before reclassifications			(422)		―
	Amounts reclassified from accumulated
		other comprehensive income (loss)		(1,415)		(1,821)
	Net current period other comprehensive income (loss)			(1,837)		(1,821)
Ending balance, March 31,			$	11,969	$	20,063

Summary of reclassifications out of AOCI

	Three Months Ended
	March 31,
	2018		2017
Postretirement Medical Plan (1)
Amortization of prior service costs (credits), before tax(2)	$	(1,837)	$	(1,821)
Tax expense (benefit)		422		―
Amounts reclassified from AOCI	$	(1,415)	$	(1,821)

(1) See Note 15 for the components of our net periodic postretirement benefit costs.

(2) Presented on the Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). The balances disclosed for the three months ended March 31,2017 were previously included in Cost of product sold and Selling, general, and administrative expenses, respectively. See Note 2 for information regarding ASU 2017-07, which we adopted on January 1, 2018.

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Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule Of Restricted Cash And Cash Equivalents [Table Text Block]

	March 31,
	2018		2017
Cash and cash equivalents	$	127,796	$	100,515
Restricted cash in other current assets		725		725
Total cash, cash equivalents, and restricted cash shown in the
statement of cash flows	$	128,521	$	101,240

Schedule Of Cash Flow Supplemental Disclosures [Table Text Block]

	Three Months Ended
	March 31,
	2018		2017
Supplemental cash flow disclosures:
Interest paid	$	2,835	$	4,893
Income taxes paid (refunded)	$	(24)	$	(257)
Supplemental non-cash investing and financing activities:
Capital expenditures included in accounts payable	$	851	$	869
Assets acquired under federal coal lease	$	2,356	$	—

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Supplemental Guarantor/Non-Guarantor Financial Information (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Guarantor/Non-Guarantor Financial Information

Schedule of Condensed Consolidating Statements of Operations and Comprehensive Income

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
		(in thousands)
			Three Months Ended March 31, 2018
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue			$	1,789	$	―	$	216,309	$	―	$	(1,789)	$	216,309
Costs and expenses
	Cost of product sold (exclusive of
		depreciation, depletion, and accretion)		―		4		192,529		1		―		192,534
	Depreciation and depletion			―		270		14,726		―		―		14,996
	Accretion			―		―		1,706		―		―		1,706
	Selling, general and administrative expenses			―		9,107		―		―		(1,789)		7,318
	Other operating costs			―		―		126		―		―		126
Total costs and expenses				―		9,381		209,087		1		(1,789)		216,680
Operating income (loss)				1,789		(9,381)		7,222		(1)		―		(371)
Other income (expense)
	Net periodic postretirement benefit income
	(cost), excluding service cost			―		268		1,349		―		―		1,617
	Interest income			2		261		―		―		―		263
	Interest expense			―		(8,862)		(108)		(218)		―		(9,188)
	Other, net			―		(147)		(268)		147		―		(268)
Total other income (expense)				2		(8,480)		973		(71)		―		(7,576)
Income (loss) before income tax provision and
	earnings from unconsolidated affiliates			1,791		(17,861)		8,195		(72)		―		(7,947)
	Income tax benefit (expense)			(63)		―		―		―		―		(63)
	Income (loss) from unconsolidated affiliates,
		net of tax		―		6		266		―		―		272
	Income (loss) from consolidated
		affiliates, net of tax		(9,467)		8,389		(72)		―		1,150		―
Net income (loss)				(7,738)		(9,467)		8,389		(72)		1,150		(7,738)
Other comprehensive income (loss)
	Postretirement medical plan amortization
		of prior service cost		(1,837)		(1,837)		(1,837)		―		3,674		(1,837)
	Income tax on postretirement medical plan
		and pension changes		―		―		―		―		―		―
Other comprehensive income (loss)				(1,837)		(1,837)		(1,837)		―		3,674		(1,837)
Total comprehensive income (loss)			$	(9,575)	$	(11,304)	$	6,552	$	(72)	$	4,824	$	(9,575)

Supplemental Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)
		(in thousands)
			Three Months Ended March 31, 2017
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Revenue			$	1,806	$	―	$	195,728	$	―	$	(1,806)	$	195,728
Costs and expenses
	Cost of product sold (exclusive of
		depreciation, depletion, and accretion)		―		―		170,269		―		―		170,269
	Depreciation and depletion			―		193		18,452		―		―		18,645
	Accretion			―		―		1,821		―		―		1,821
	(Gain) loss on derivative financial instruments			―		―		2,344		―		―		2,344
	Selling, general and administrative expenses			―		12,782		―		―		(1,806)		10,976
	Debt restructuring costs			―		40		―		―		―		40
	Other operating costs			―		―		176		―		―		176
Total costs and expenses				―		13,015		193,062		―		(1,806)		204,271
Operating income (loss)				1,806		(13,015)		2,666		―		―		(8,543)
Other income (expense)
	Net periodic postretirement benefit income
	(cost), excluding service cost			―		262		1,330		―		―		1,592
	Interest income			1		38		―		―		―		39
	Interest expense			(41)		(12,548)		(134)		(189)		―		(12,912)
	Other, net			―		(60)		(310)		60		―		(310)
Total other income (expense)				(40)		(12,308)		886		(129)		―		(11,591)
Income (loss) before income tax provision and
	earnings from unconsolidated affiliates			1,766		(25,323)		3,552		(129)		―		(20,134)
	Income tax benefit (expense)			(300)		―		―		―		―		(300)
	Income (loss) from unconsolidated affiliates,
		net of tax		―		2		324		―		―		326
	Income (loss) from consolidated
		affiliates, net of tax		(21,574)		3,745		(129)		―		17,958		―
Net income (loss)				(20,108)		(21,576)		3,747		(129)		17,958		(20,108)
Other comprehensive income (loss)
	Postretirement medical plan amortization
		of prior service cost		(1,821)		(1,821)		(1,821)		―		3,642		(1,821)
	Income tax on postretirement medical plan
		and pension changes		―		―		―		―		―		―
Other comprehensive income (loss)				(1,821)		(1,821)		(1,821)		―		3,642		(1,821)
Total comprehensive income (loss)			$	(21,929)	$	(23,397)	$	1,926	$	(129)	$	21,600	$	(21,929)

Schedule of Condensed Consolidating Balance Sheet

Supplemental Condensed Consolidating Balance Sheet
(in thousands)
			March 31, 2018
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets
	Cash and cash equivalents		$	—	$	127,684	$	112	$	—	$	—	$	127,796
	Accounts receivable			—		—		20,541		24,484		—		45,025
	Due from related parties			—		69,760		2,065		—		(71,825)		—
	Inventories, net			—		—		70,347		—		—		70,347
	Income tax receivable			232		—		—		—		—		232
	Other prepaid and deferred charges			85		—		23,684		—		—		23,769
	Other assets			—		—		802		—		—		802
		Total current assets		317		197,444		117,551		24,484		(71,825)		267,971
Noncurrent assets
	Property, plant and equipment, net			—		3,240		1,351,759		—		—		1,354,999
	Goodwill			—		—		2,280		—		—		2,280
	Income tax receivable			29,454		—		—		—		—		29,454
	Other assets			1,032,742		1,248,668		37,710		299		(2,284,988)		34,431
		Total assets	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813)	$	1,689,135
LIABILITIES AND MEMBER'S EQUITY
Current liabilities
	Accounts payable		$	2	$	25	$	25,503	$	60	$	—	$	25,590
	Royalties and production taxes			—		—		54,775		—		—		54,775
	Accrued expenses			8,812		10,301		18,806		—		—		37,919
	Due to related parties			54,866		71		—		16,959		(71,825)		71
	Current portion of federal coal lease
		obligations		—		—		379		—		—		379
	Other liabilities			—		—		2,195		—		—		2,195
		Total current liabilities		63,680		10,397		101,658		17,019		(71,825)		120,929
Noncurrent liabilities
	Senior notes			—		406,261		—		—		—		406,261
	Federal coal lease obligations, net of
		current portion		—		—		1,404		—		—		1,404
	Asset retirement obligations, net of
		current portion		—		—		100,817		—		—		100,817
	Accumulated postretirement medical benefit
		obligation, net of current portion		—		—		25,303		—		—		25,303
	Royalties and production taxes			—		—		28,592		—		—		28,592
	Other liabilities			—		—		6,996		—		—		6,996
		Total liabilities		63,680		416,658		264,770		17,019		(71,825)		690,302
Commitments and Contingencies (Note 17)				—		—		—		—		—
		Total equity		998,833		1,032,694		1,244,530		7,764		(2,284,988)		998,833
		Total liabilities and equity	$	1,062,513	$	1,449,352	$	1,509,300	$	24,783	$	(2,356,813)	$	1,689,135

Supplemental Condensed Consolidating Balance Sheet
(in thousands)
			December 31, 2017
			Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
ASSETS
Current assets
	Cash and cash equivalents		$	—	$	107,818	$	130	$	—	$	—	$	107,948
	Accounts receivable			—		—		17,359		32,716		—		50,075
	Due from related parties			—		46,350		23,044		—		(69,272)		122
	Inventories, net			—		—		72,904		—		—		72,904
	Income tax receivable			256		—		—		—		—		256
	Other prepaid and deferred charges			283		—		36,681		—		—		36,964
	Other assets			—		—		1,765		—		—		1,765
		Total current assets		539		154,168		151,883		32,716		(69,272)		270,034
Noncurrent assets
	Property, plant and equipment, net			—		3,480		1,362,275		—		—		1,365,755
	Goodwill			—		—		2,280		—		—		2,280
	Income tax receivable			29,454		—		—		—		—		29,454
	Other assets			1,036,162		1,289,487		33,612		341		(2,328,424)		31,178
		Total assets	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696)	$	1,698,701
LIABILITIES AND MEMBER'S EQUITY
Current liabilities
	Accounts payable		$	1	$	24	$	29,748	$	59	$	—	$	29,832
	Royalties and production taxes			—		—		54,327		—		—		54,327
	Accrued expenses			3,160		5,659		23,999		—		—		32,818
	Due to related parties			44,039		71		—		25,162		(69,272)		—
	Other liabilities			—		—		2,435		—		—		2,435
		Total current liabilities		47,200		5,754		110,509		25,221		(69,272)		119,412
Noncurrent liabilities
	Senior notes			—		405,266		—		—		—		405,266
	Asset retirement obligations, net of
		current portion		—		—		99,297		—		—		99,297
	Accumulated postretirement medical benefit
		obligation, net of current portion		—		—		24,958		—		—		24,958
	Royalties and production taxes			—		—		21,896		—		—		21,896
	Other liabilities			11,146		—		8,917		—		—		20,063
		Total liabilities		58,346		411,020		265,577		25,221		(69,272)		690,892
Commitments and Contingencies (Note 17)				—		—		—		—		—
		Total equity		1,007,809		1,036,115		1,284,473		7,836		(2,328,424)		1,007,809
		Total liabilities and equity	$	1,066,155	$	1,447,135	$	1,550,050	$	33,057	$	(2,397,696)	$	1,698,701

Schedule of Condensed Consolidating Statements of Cash Flows

Supplemental Condensed Consolidating Statement of Cash Flows
(in thousands)
		Three Months Ended March 31, 2018
		Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net cash provided by (used in) operating
	activities	$	—	$	19,898	$	4,178	$	—	$	—	$	24,076
Investing activities
	Purchases of property, plant and equipment		—		(31)		(2,615)		—		—		(2,646)
	Investment in development projects		—		—		(360)		—		—		(360)
Net cash provided by (used in) investing
	activities		—		(31)		(2,975)		—		—		(3,006)
Financing activities
	Principal payments of federal coal leases		—		—		(574)		—		—		(574)
	Other		—		—		(648)		—		—		(648)
Net cash provided by (used in) financing
	activities		—		—		(1,222)		—		—		(1,222)
Net increase (decrease) in cash,
	cash equivalents, and restricted cash		—		19,867		(19)		—		—		19,848
Cash, cash equivalents, and restricted cash
	at beginning of period		—		107,818		856		—		—		108,673
Cash, cash equivalents, and restricted cash
	at the end of period	$	—	$	127,684	$	836	$	—	$	—	$	128,521

Supplemental Condensed Consolidating Statement of Cash Flows
(in thousands)
		Three Months Ended March 31, 2017
		Parent Guarantor (CPE Inc.)		Issuing Company (CPE Resources)		Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Eliminations		Consolidated
Net cash provided by (used in) operating
	activities	$	—	$	14,437	$	4,856	$	402	$	—	$	19,695
Investing activities
	Purchases of property, plant and equipment		—		(386)		(3,738)		—		—		(4,124)
Net cash provided by (used in) investing
	activities		—		(386)		(3,738)		—		—		(4,124)
Financing activities
	Repayment of senior notes		—		(62,094)		—		—		—		(62,094)
	Payment of debt refinancing costs		—		—		—		(402)		—		(402)
	Payment of debt restructuring costs		—		(40)		—		—		—		(40)
	Proceeds from issuance of common stock		—		68,850		—		—		—		68,850
	Cash paid for equity offering		—		(4,434)		—		—		—		(4,434)
	Other		—		—		(644)		—		—		(644)
Net cash provided by (used in) financing
	activities		—		2,282		(644)		(402)		—		1,236
Net increase (decrease) in cash,
	cash equivalents, and restricted cash		—		16,333		474		—		—		16,807
Cash, cash equivalents, and restricted cash
	at beginning of period		—		83,673		760		—		—		84,433
Cash, cash equivalents, and restricted cash
	at the end of period	$	—	$	100,006	$	1,234	$	—	$	—	$	101,240

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Organization and Business (Details)	3 Months Ended
	Mar. 31, 2018 Item
Organization and Business
Number of surface coal mines operated by entity	3
Number of major development projects	2
Percentage of electricity generated in the U.S. from the coal produced	2.00%

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Accounting Policies and Standards Update (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 02, 2018	Dec. 31, 2017
Accounting Standards Update 201707 [Abstract]
Cost of Goods Sold	$ 192,534	$ 170,269
Selling, general and administrative expenses	7,318	10,976
Operating income (loss)	(371)	(8,543)
Net periodic postretirement benefit income (cost), excluding service cost	1,617	1,592
Total other income (expense)	(7,576)	(11,591)
Accounting Standards Update 2014-09 [Abstract]
Accounts receivable	45,025			$ 50,075
Inventory, Net	70,347			72,904
Retained earnings	339,429			347,046
Accounting Standards Update 2017-07 [Member] | Scenario Previously Reported [Member]
Accounting Standards Update 201707 [Abstract]
Cost of Goods Sold		168,939
Selling, general and administrative expenses		10,714
Operating income (loss)		(6,951)
Net periodic postretirement benefit income (cost), excluding service cost		0
Total other income (expense)		(13,183)
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member]
Accounting Standards Update 201707 [Abstract]
Cost of Goods Sold		1,330
Selling, general and administrative expenses		262
Operating income (loss)		(1,592)
Net periodic postretirement benefit income (cost), excluding service cost		1,592
Total other income (expense)		$ 1,592
Accounting Standards Update 2014-09 [Member]
Accounting Standards Update 2014-09 [Abstract]
Accounts receivable			$ 50,856
Inventory, Net			72,244
Retained earnings			$ 347,167
Accounting Standards Update 2014-09 [Member] | Difference Between Revenue Guidance In Effect Before And After Topic 606 [Member]
Accounting Standards Update 201707 [Abstract]
Cost of Goods Sold	(660)
Accounting Standards Update 2014-09 [Abstract]
Accounts receivable	0			781
Inventory, Net	0			(660)
Retained earnings	$ 0			$ 121

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Revenue (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 02, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax	$ 216,309	$ 195,728
Cost of product sold	192,534	170,269
Net income (loss)	$ (7,738)	$ (20,108)
Income (loss) per common share
Basic	$ (0.1)	$ (0.3)
Diluted	$ (0.1)	$ (0.3)
Accounts Receivable, Net, Current	$ 45,025			$ 50,075
Inventory, Net	70,347			72,904
Retained Earnings (Accumulated Deficit)	$ 339,429			347,046
Sales Channel Directly To Consumer [Member] | Owned and Operated Mines [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Performance Obligation Description Of Timing	P1Y
Accounting Standards Update 2014-09 [Member]
Income (loss) per common share
Accounts Receivable, Net, Current			$ 50,856
Inventory, Net			72,244
Retained Earnings (Accumulated Deficit)			$ 347,167
Minimum [Member] | Sales Channel Through Intermediary [Member] | Logistics and Related Activities [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Performance Obligation Description Of Timing	P1Y
Maximum [Member] | Sales Channel Through Intermediary [Member] | Logistics and Related Activities [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Performance Obligation Description Of Timing	P3Y
Balances without the adoption of ASC 606 | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax	$ 217,091
Cost of product sold	193,194
Net income (loss)	$ (7,617)
Income (loss) per common share
Basic	$ (0.1)
Diluted	$ (0.1)
Accounts Receivable, Net, Current	$ 45,025
Inventory, Net	70,347
Retained Earnings (Accumulated Deficit)	339,429
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax	(781)
Cost of product sold	(660)
Net income (loss)	$ (121)
Income (loss) per common share
Basic	$ 0
Diluted	$ 0
Accounts Receivable, Net, Current	$ 0			781
Inventory, Net	0			(660)
Retained Earnings (Accumulated Deficit)	$ 0			$ 121

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Revenue (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 216,309	$ 195,728
United States
Disaggregation Of Revenue [Line Items]
Revenue	138,232	170,866
South Korea
Disaggregation Of Revenue [Line Items]
Revenue	66,021	16,961
Other
Disaggregation Of Revenue [Line Items]
Revenue	$ 12,056	$ 7,901

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Revenue (Details 2) $ in Millions	Mar. 31, 2018 USD ($)
Owned and Operated Mines [Member] | Fixed Price Contract [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Remaining Performance Obligation	$ 777
Revenue Remaining Performance Obligation Percentage	80.00%
Logistics and Related Activities [Member] | Fixed Price Contract [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Remaining Performance Obligation	$ 102
Logistics and Related Activities [Member] | Indexed Price Contract [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue Remaining Performance Obligation	$ 280
Revenue Remaining Performance Obligation Percentage	30.00%

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Revenue (Details 3) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable	$ 45,025	$ 50,075
Trade accounts receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable	44,606	47,872
Other receivables
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable	$ 419	$ 2,203

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Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Item	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Reported segment | Item	2
Revenues Abstract
Consolidated revenue	$ 216,309	$ 195,728
Capital Expenditures
Capital Expenditures	6,213	4,993
Depreciation and depletion	(14,996)	(18,645)
Accretion	(1,706)	(1,821)
Debt restructuring costs		(40)
Derivative financial instruments
(Gain) loss on derivative financial instruments	0	(2,344)
Inclusion of cash amounts (received) paid	0	336
Total derivative financial instruments	0	(2,008)
Interest expense, net	(8,925)	(12,873)
(Income) loss from unconsolidated affiliates, net of tax	(272)	(326)
Non-cash throughput amortization expense and contract termination payments	(1,690)	(4,851)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(7,947)	(20,134)
Intersegment Elimination
Revenues Abstract
Consolidated revenue	(16,983)	(7,424)
Operating Segments [Member]
Capital Expenditures
Adjusted EBITDA	25,714	31,174
Owned and Operated Mines | Operating Segments [Member]
Revenues Abstract
Consolidated revenue	153,653	173,611
Capital Expenditures
Capital Expenditures	6,182	4,596
Adjusted EBITDA	18,616	33,738
Logistics and Related Activities | Operating Segments [Member]
Revenues Abstract
Consolidated revenue	79,636	28,248
Capital Expenditures
Capital Expenditures	0	0
Adjusted EBITDA	7,098	(2,564)
Corporate and Other | Operating Segments [Member]
Revenues Abstract
Consolidated revenue	3	1,293
Capital Expenditures
Capital Expenditures	31	397
Adjusted EBITDA	$ (6,072)	$ (10,744)

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Transportation Agreements (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Transportation Agreement Disclosure [Line Items]
Minimum payments term	2 years
Deferred assets for termination of contracts		$ 20.8		$ 22.4
Shipping Handling And Transportation Costs		52.3	$ 24.0
Amortization of transportation agreements		4.2	$ 10.6
Other Assets [Member]
Transportation Agreement Disclosure [Line Items]
Deferred assets for termination of contracts		5.5
Other prepaid and deferred charges
Transportation Agreement Disclosure [Line Items]
Deferred assets for termination of contracts		$ 15.3		$ 22.4

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Transportation Agreements (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Transportation Agreements [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Outstanding amount of long-term purchase commitment	$ 62,142	$ 45,708

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Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest expense, Net
Senior Notes	$ 6,461	$ 7,986
Credit facility unutilized fee	701	1,183
Federal coal lease obligations imputed interest	68	86
Amortization of deferred financing costs and original issue discount	1,919	1,986
Other	39	89
Subtotal	9,188	11,330
Premium on early retirement of debt	0	880
Write-off of deferred financing costs and original issue discount	0	702
Other	0	0
Total cost of early retirement of debt and refinancings	0	1,582
Total Interest Expense	$ 9,188	12,912
Senior 8.50 Percent Notes Due 2019 [Member]
Interest expense, Net
Write-off of deferred financing costs and original issue discount		700
Equity Offering [Line Items]
Interest Paid		$ 1,500

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Interes Expense (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Expense Debt Abstract
Net interest expense	$ 9,188	$ 12,912
InterestCostsIncurred	$ 9,188	$ 12,912

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Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income tax provision [(benefit)] for continuing operations
AMT Tax rate				20.00%
United States federal statutory income tax rate	21.00%
Statutory income tax rate		23.00%	37.00%
Effective tax rate (as a percent)		(0.80%)	(1.50%)
AMT value				$ 30

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Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Equity Method Investments [Line Items]
Distributions of income from unconsolidated affiliates	$ 1,000	$ 3,000
Equity Method Investments	$ 4,034	4,763
Venture Fuels Partnership
Schedule Of Equity Method Investments [Line Items]
Equity investment in Venture Fuels Partnership (as a percent)	50.00%
Distributions of income from unconsolidated affiliates	$ 1,000	3,000
Equity Method Investments	3,041	3,774
Other Investment [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 993	$ 989

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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Common stock, New shares issued	13,500
Numerator for calculation of diluted earnings (loss) per share
Net income (loss)		$ (7,738)	$ (20,108)
Denominator for basic income (loss) per share
Weighted-average shares outstanding		75,329	66,132
Denominator for diluted earnings (loss) per share		75,329	66,132
Basic earnings (loss) per share		$ (0.1)	$ (0.3)
Diluted earnings (loss) per share		$ (0.1)	$ (0.3)
Stock Compensation Plan [Member]
Anti-dilutive securities excluded from diluted earnings (loss) per share calculation
Anti-dilutive stock equivalents		4,227	2,993

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Fair Value of Financial Instruments (Details) - Recurring Basis - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Assets
Money market funds	$ 64,283	$ 49,102
Demand deposits	63,500	58,800
Transfer of assets from level 1 to level 2	0	0
Transfer of assets from level 2 to level 1	0	0
Transfer of liabilities from level 1 to level 2	0	0
Transfer of liabilities from level 2 to level 1	0	0
Transfer of assets into level 3	0	0
Transfer of assets out of level 3	0	0
Transfer of liabilities into level 3	0	0
Transfer of liabilities out of level 3	0	0
Level 1
Assets
Money market funds	$ 64,283	$ 49,102

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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
(Gain) loss on derivative financial instruments	$ 0	$ 2,344
WTI derivative financial instruments
Derivative [Line Items]
Derivative mark-to-market losses (gains)		$ 2,344

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Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventories
Materials and supplies	$ 69,903	$ 68,461
Less: Obsolescence allowance	(1,059)	(1,094)
Material and supplies, net	68,844	67,367
Coal inventory	1,503	5,537
Inventories, net	$ 70,347	$ 72,904

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Senior Notes and Equity (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended
	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Equity Offering [Line Items]
Common Stock Shares Issued	13.5
Net proceeds of common stock issued	$ 64,700
Write-off of deferred financing costs and original issue discount		$ 0	$ 702
Debt Instrument [Line Items]
Principal		346,774		$ 346,774
Unamortized discount and debt issuance costs		13,480		14,475
Unamortized Deferred Gain Forgiven Debt		(72,967)		(72,967)
Carrying Value		406,261		405,266
Fair Value		352,823		361,746
Senior 8.50 Percent Notes Due 2019
Equity Offering [Line Items]
Redemption price percentage of principal amount			101.417%
Interest paid			$ 1,500
Principal amount with premium of notes redeemed			63,000
Total Redemption costs			64,500
Write-off of deferred financing costs and original issue discount			700
Senior 8.50 Percent Notes Due 2019
Debt Instrument [Line Items]
Principal			$ 62,100
Interest rate (as a percent)			8.50%
Senior 6.375 Percent Notes Due 2024
Debt Instrument [Line Items]
Principal		56,408		56,408
Unamortized discount and debt issuance costs		826		861
Unamortized Deferred Gain Forgiven Debt		0		0
Carrying Value		55,582		55,547
Fair Value		$ 45,761		$ 45,973
Interest rate (as a percent)		6.375%		6.375%
Senior 12.0 Percent Notes Due 2021
Debt Instrument [Line Items]
Principal		$ 290,366		$ 290,366
Unamortized discount and debt issuance costs		12,654		13,614
Unamortized Deferred Gain Forgiven Debt		(72,967)		(72,967)
Carrying Value		350,679		349,719
Fair Value		$ 307,062		$ 315,773
Interest rate (as a percent)		12.00%		12.00%

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Other Obligations (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Capital lease obligations
Future payments on capital equipment lease obligation payments
2018	$ 1,882
2019	1,698
2020	856
2021	27
Total	4,463
Less: interest	171
Total principal payments	4,292
Less: current portion	2,195
Capital equipment lease obligations, net of current portion	2,097
Federal Coal Lease Obligation [Member]
Other Obligations
2019	600
2020	600
2021	600
2022	600
Federal coal Lease obligations	$ 1,800

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Other Obligations (Details 1) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Jan. 31, 2017	Sep. 09, 2016	Feb. 11, 2013
Interest and Facility Fee Discussion
Reduction of letters of credit	$ (44.5)
Credit Agreement and the A/R Securitization Program
Line of Credit Facility [Line Items]
Borrowing capacity allowed	400.0
Total Liquidity	527.8
Interest and Facility Fee Discussion
Unamortized debt issuance costs	3.4	$ 4.4
A/R Securitization Program
Line of Credit Facility [Line Items]
Maximum amount under senior secured revolving credit facility			$ 70.0		$ 75.0
Letters of credit that can be issued	23.0
Borrowing capacity allowed	19.9
Interest and Facility Fee Discussion
Reduction of letters of credit	$ (3.1)	$ (1.1)
Senior Secured Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum amount under senior secured revolving credit facility				$ 400.0
Letters of credit that can be issued				$ 250.0

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Postretirement Medical Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Postretirement Medical Plan
Net periodic benefit cost	$ (1,421)	$ (1,368)
Post retirement medical plan
Postretirement Medical Plan
Service cost	197	223
Interest cost	220	230
Amortization of prior service cost	(1,837)	(1,821)
Net periodic benefit cost	$ (1,420)	$ (1,368)

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Equity-Based Compensation (Details) - LTIP - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	May 09, 2018	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pool of shares of common stock for issuance in connection with share-based awards		0
Additional shares requested	3,000,000
Vesting Period Change in Control Termination Without Cause		2 years
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Restricted stock and performance based share unit award activity
Non-vested shares at the beginning of the period, number (in shares)		2,813,000
Granted, number (in shares)		866,000
Vested, number (in shares)		(324,000)
Non-vested shares at the end of the period, number (in shares)		3,355,000	2,813,000
Weighted Average Grant-Date Fair Value (per share)
Non-vested shares at the beginning of the period (in dollars per share)		$ 3.75
Granted (in dollars per share)		3.5
Vested (in dollars per share)		7.96
Non-vested shares at the end of the period (in dollars per share)		$ 3.27	$ 3.75
Unrecognized compensation cost		$ 4.8
Weighted-average period over which unrecognized compensation cost recognized prior to vesting		2 years 2 months 12 days
Performance Based Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Restricted stock and performance based share unit award activity
Non-vested shares at the beginning of the period, number (in shares)		3,685,000
Granted, number (in shares)		1,153,000
Vested, number (in shares)		(530,000)
Non-vested shares at the end of the period, number (in shares)		4,308,000	3,685,000
Weighted Average Grant-Date Fair Value (per share)
Non-vested shares at the beginning of the period (in dollars per share)		$ 4.08
Granted (in dollars per share)		4.05	$ 5.85
Vested (in dollars per share)		9.66
Non-vested shares at the end of the period (in dollars per share)		$ 3.38	$ 4.08
Unrecognized compensation cost		$ 10.1
Weighted-average period over which unrecognized compensation cost recognized prior to vesting		2 years
Performance-Based Share Units
Percentage of target amount, low end of range		0.00%
Percentage of target amount, high end of range		200.00%
Assumptions
Risk-free interest rate		2.40%
Expected volatility		62.26%
Term		2 years 9 months 18 days
Fair value (per share)		$ 4.05

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Commitments and Contingencies (Details 1) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Equipment
Unrecorded Unconditional Purchase Obligation [Line Items]
Outstanding amount of long-term purchase commitment	$ 6,818	$ 4,191

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Commitments and Contingencies (Details 2)	Mar. 26, 2018 Item	Feb. 01, 2018 a	Sep. 20, 2017 Item	Aug. 22, 2017 Item	Jul. 17, 2017 Item	Oct. 21, 2016 Item	Mar. 15, 2016 Item	Nov. 25, 2015 Item	Sep. 15, 2015 Item
Antelope Mine [Member]
Commitment and Contingency [Line Items]
Acres related to estimated quantity of mineral rights under challenge | a		857
California [Member]
Commitment and Contingency [Line Items]
Complaints Filed					3
Northern Plains Resource Council Regulatory Challenge To Office Of Surface Minings Approval Process For Mine Plans Litigation [Member] | Antelope Mine [Member]
Commitment and Contingency [Line Items]
Number of different coal mines located in two different states for which approvals are challenged									4
Challenged Mine Plan Modifications									1
Northern Plains Resource Council Regulatory Challenge To Office Of Surface Minings Approval Process For Mine Plans Litigation [Member] | COLORADO [Member] | Antelope Mine [Member]
Commitment and Contingency [Line Items]
Number of different coal mines located in two different states for which approvals are challenged									1
Northern Plains Resource Council Regulatory Challenge To Office Of Surface Minings Approval Process For Mine Plans Litigation [Member] | WYOMING [Member] | Antelope Mine [Member]
Commitment and Contingency [Line Items]
Number of different coal mines located in two different states for which approvals are challenged									3
Wild Earth Guardians Regulatory Challenge to Office of Surface Minings Approval Process for Mine Plans Litigation [Member] | Antelope Mine [Member]
Commitment and Contingency [Line Items]
Administrative Record Documents						3
Notices of Supplemental Authority			1	1
Wild Earth Guardians Regulatory Challenge to Office of Surface Minings Approval Process for Mine Plans Litigation [Member] | WYOMING [Member] | Antelope Mine [Member]
Commitment and Contingency [Line Items]
Number of Mines included in OSM motion to sever complaint and transfer								2
BLM Approval of Revised Resource Managment Plans [Member]
Commitment and Contingency [Line Items]
Lease Planning Areas							2
Claims Filed	3

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Commitments and Contingencies (Details 3) $ in Millions	Mar. 31, 2018 USD ($) Item	Mar. 31, 2017 Item	Jan. 31, 2017 USD ($)
Concentration Risk [Line Items]
Outstanding amount of self-funded bonds			$ 10.0
Outstanding amount of surety bonds	$ 413.6
Collateral posted in the form of letters of credit	23.0
Reduction of letters of credit	$ (44.5)
Customer Concentration Risk [Member] | Revenues
Concentration Risk [Line Items]
Number or major customers | Item	0	1

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income (Loss) (AOCI) by component, net of tax
Beginning balance, January 1	$ 13,807
Ending balance, March 31	11,969
Post retirement medical plan | Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss) (AOCI) by component, net of tax
Beginning balance, January 1	13,807	$ 21,884
Other comprehensive income (loss) before reclassifications	(422)	0
Amounts reclassified from accumulated other comprehensive income (loss)	(1,415)	(1,821)
Net current period other comprehensive income (loss)	(1,837)	(1,821)
Ending balance, March 31	$ 11,969	$ 20,063

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Accumulated Other Comprehensive Income (Loss) (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income	$ (1,617)	$ (1,592)
Post retirement medical plan | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Statement Of Income Or Comprehensive Income	(1,837)	(1,821)
Tax expense (benefit)	422	0
Amounts reclassified from AOCI	$ (1,415)	$ (1,821)

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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 127,796	$ 100,515	$ 107,948
Restricted cash in other current assets	725	725
Total cash, cash equivalents, and restricted cash shown in the statment of cash flows	128,521	101,240	$ 108,673	$ 84,433
Supplemental Cash Flow Information [Abstract]
Interest paid	2,835	4,893
Income taxes paid (refunded)	(24)	(257)
Noncash Investing and Financing Items [Abstract]
Capital expenditures included in accounts payable	851	$ 869
Assets acquired under federal coal lease	$ 2,356

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Supplemental Guarantor/Non-Guarantor Financial Information (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	$ 216,309	$ 195,728
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	192,534	170,269
Depreciation and depletion	14,996	18,645
Accretion	1,706	1,821
(Gain) loss on derivative financial instruments	0	2,344
Selling, general and administrative expenses	7,318	10,976
Debt restructuring costs		40
Other operating costs	126	176
Total costs and expenses	216,680	204,271
Operating income (loss)	(371)	(8,543)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	1,617	1,592
Interest income	263	39
Interest expense	(9,188)	(12,912)
Other, net	(268)	(310)
Other income (expense)	(7,576)	(11,591)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(7,947)	(20,134)
Income tax benefit (expense)	(63)	(300)
Income (loss) from unconsolidated affiliates, net of tax	272	326
Net income (loss)	(7,738)	(20,108)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837)	(1,821)
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	(1,837)	(1,821)
Total comprehensive income (loss)	(9,575)	(21,929)
Eliminations
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	(1,789)	(1,806)
Costs and expenses
Selling, general and administrative expenses	(1,789)	(1,806)
Total costs and expenses	(1,789)	(1,806)
Operating income (loss)	0
Other income (expense)
Income (loss) from consolidated affiliates, net of tax	1,150	17,958
Net income (loss)	1,150	17,958
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	3,674	3,642
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	3,674	3,642
Total comprehensive income (loss)	4,824	21,600
Parent Guarantor (CPE Inc.) | Reportable Legal Entities [Member]
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	1,789	1,806
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	0	0
Depreciation and depletion	0	0
Accretion	0	0
(Gain) loss on derivative financial instruments		0
Selling, general and administrative expenses	0	0
Debt restructuring costs		0
Other operating costs	0	0
Total costs and expenses	0	0
Operating income (loss)	1,789	1,806
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	0	0
Interest income	2	1
Interest expense	0	(41)
Other, net	0	0
Other income (expense)	2	(40)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	1,791	1,766
Income tax benefit (expense)	(63)	(300)
Income (loss) from unconsolidated affiliates, net of tax	0	0
Income (loss) from consolidated affiliates, net of tax	(9,467)	(21,574)
Net income (loss)	(7,738)	(20,108)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837)	(1,821)
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	(1,837)	(1,821)
Total comprehensive income (loss)	(9,575)	(21,929)
Issuers | Reportable Legal Entities [Member]
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	0	0
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	4	0
Depreciation and depletion	270	193
Accretion	0	0
(Gain) loss on derivative financial instruments		0
Selling, general and administrative expenses	9,107	12,782
Debt restructuring costs		40
Other operating costs	0	0
Total costs and expenses	9,381	13,015
Operating income (loss)	(9,381)	(13,015)
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	268	262
Interest income	261	38
Interest expense	(8,862)	(12,548)
Other, net	(147)	(60)
Other income (expense)	(8,480)	(12,308)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(17,861)	(25,323)
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated affiliates, net of tax	6	2
Income (loss) from consolidated affiliates, net of tax	8,389	3,745
Net income (loss)	(9,467)	(21,576)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837)	(1,821)
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	(1,837)	(1,821)
Total comprehensive income (loss)	(11,304)	(23,397)
Guarantor Subsidiaries | Reportable Legal Entities [Member]
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	216,309	195,728
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	192,529	170,269
Depreciation and depletion	14,726	18,452
Accretion	1,706	1,821
(Gain) loss on derivative financial instruments		2,344
Selling, general and administrative expenses	0	0
Debt restructuring costs		0
Other operating costs	126	176
Total costs and expenses	209,087	193,062
Operating income (loss)	7,222	2,666
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	1,349	1,330
Interest income	0	0
Interest expense	(108)	(134)
Other, net	(268)	(310)
Other income (expense)	973	886
Income (loss) before income tax provision and earnings from unconsolidated affiliates	8,195	3,552
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated affiliates, net of tax	266	324
Income (loss) from consolidated affiliates, net of tax	(72)	(129)
Net income (loss)	8,389	3,747
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	(1,837)	(1,821)
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	(1,837)	(1,821)
Total comprehensive income (loss)	6,552	1,926
Non-Guarantor Subsidiaries | Reportable Legal Entities [Member]
Supplemental Condensed Consolidating Statement of Operations and Comprehensive Income
Revenue	0	0
Costs and expenses
Cost of product sold (exclusive of depreciation, depletion, and accretion)	1	0
Depreciation and depletion	0	0
Accretion	0	0
(Gain) loss on derivative financial instruments		0
Selling, general and administrative expenses	0	0
Debt restructuring costs		0
Other operating costs	0	0
Total costs and expenses	1	0
Operating income (loss)	(1)	0
Other income (expense)
Net periodic postretirement benefit income (cost), excluding service cost	0	0
Interest income	0	0
Interest expense	(218)	(189)
Other, net	147	60
Other income (expense)	(71)	(129)
Income (loss) before income tax provision and earnings from unconsolidated affiliates	(72)	(129)
Income tax benefit (expense)	0	0
Income (loss) from unconsolidated affiliates, net of tax	0	0
Income (loss) from consolidated affiliates, net of tax	0	0
Net income (loss)	(72)	(129)
Other comprehensive income (loss)
Postretirement medical plan amortization of prior service costs	0	0
Income tax on postretirement medical and pension changes	0	0
Other comprehensive income (loss)	0	0
Total comprehensive income (loss)	$ (72)	$ (129)

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Supplemental Guarantor/Non-Guarantor Financial Information (Details 2) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Current assets
Cash and cash equivalents	$ 127,796	$ 107,948	$ 100,515
Accounts receivable	45,025	50,075
Due from related parties	0	122
Inventories, net	70,347	72,904
Income tax receivable	232	256
Other prepaid and deferred charges	23,769	36,964
Other assets	802	1,765
Total current assets	267,971	270,034
Noncurrent assets
Property, plant and equipment, net	1,354,999	1,365,755
Goodwill	2,280	2,280
Income tax receivable	29,454	29,454
Other assets	34,431	31,178
Total assets	1,689,135	1,698,701
Current liabilities
Accounts payable	25,590	29,832
Royalties and production taxes	54,775	54,327
Accrued expenses	37,919	32,818
Due to related parties	71	0
Current portion of federal coal lease obligations	379	0
Other liabilities	2,195	2,435
Total current liabilities	120,929	119,412
Noncurrent liabilities
Senior notes	406,261	405,266
Federal coal lease obligations, net of current portion	1,404	0
Asset retirement obligations, net of current portion	100,817	99,297
Accumulated postretirement medical benefit obligation, net of current portion	25,303	24,958
Royalties And Production Taxes Noncurrent	28,592	21,896
Other liabilities	6,996	20,063
Total liabilities	690,302	690,892
Commitments and Contingencies (Note 17)
Total equity	998,833	1,007,809
Total liabilities and equity	1,689,135	1,698,701
Eliminations
Current assets
Due from related parties	(71,825)	(69,272)
Total current assets	(71,825)	(69,272)
Noncurrent assets
Other assets	(2,284,988)	(2,328,424)
Total assets	(2,356,813)	(2,397,696)
Current liabilities
Due to related parties	(71,825)	(69,272)
Total current liabilities	(71,825)	(69,272)
Noncurrent liabilities
Total liabilities	(71,825)	(69,272)
Total equity	(2,284,988)	(2,328,424)
Total liabilities and equity	(2,356,813)	(2,397,696)
Parent Guarantor (CPE Inc.) | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	0	0
Accounts receivable	0	0
Due from related parties	0	0
Inventories, net	0	0
Income tax receivable	232	256
Other prepaid and deferred charges	85	283
Other assets	0	0
Total current assets	317	539
Noncurrent assets
Property, plant and equipment, net	0	0
Goodwill	0	0
Income tax receivable	29,454	29,454
Other assets	1,032,742	1,036,162
Total assets	1,062,513	1,066,155
Current liabilities
Accounts payable	2	1
Royalties and production taxes	0	0
Accrued expenses	8,812	3,160
Due to related parties	54,866	44,039
Current portion of federal coal lease obligations	0
Other liabilities	0	0
Total current liabilities	63,680	47,200
Noncurrent liabilities
Senior notes	0	0
Federal coal lease obligations, net of current portion	0
Asset retirement obligations, net of current portion	0	0
Accumulated postretirement medical benefit obligation, net of current portion	0	0
Royalties And Production Taxes Noncurrent	0	0
Other liabilities	0	11,146
Total liabilities	63,680	58,346
Total equity	998,833	1,007,809
Total liabilities and equity	1,062,513	1,066,155
Issuers | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	127,684	107,818
Accounts receivable	0	0
Due from related parties	69,760	46,350
Inventories, net	0	0
Income tax receivable	0	0
Other prepaid and deferred charges	0	0
Other assets	0	0
Total current assets	197,444	154,168
Noncurrent assets
Property, plant and equipment, net	3,240	3,480
Goodwill	0	0
Income tax receivable	0	0
Other assets	1,248,668	1,289,487
Total assets	1,449,352	1,447,135
Current liabilities
Accounts payable	25	24
Royalties and production taxes	0	0
Accrued expenses	10,301	5,659
Due to related parties	71	71
Current portion of federal coal lease obligations	0
Other liabilities	0	0
Total current liabilities	10,397	5,754
Noncurrent liabilities
Senior notes	406,261	405,266
Federal coal lease obligations, net of current portion	0
Asset retirement obligations, net of current portion	0	0
Accumulated postretirement medical benefit obligation, net of current portion	0	0
Royalties And Production Taxes Noncurrent	0	0
Other liabilities	0	0
Total liabilities	416,658	411,020
Total equity	1,032,694	1,036,115
Total liabilities and equity	1,449,352	1,447,135
Guarantor Subsidiaries | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	112	130
Accounts receivable	20,541	17,359
Due from related parties	2,065	23,044
Inventories, net	70,347	72,904
Income tax receivable	0	0
Other prepaid and deferred charges	23,684	36,681
Other assets	802	1,765
Total current assets	117,551	151,883
Noncurrent assets
Property, plant and equipment, net	1,351,759	1,362,275
Goodwill	2,280	2,280
Income tax receivable	0	0
Other assets	37,710	33,612
Total assets	1,509,300	1,550,050
Current liabilities
Accounts payable	25,503	29,748
Royalties and production taxes	54,775	54,327
Accrued expenses	18,806	23,999
Due to related parties	0	0
Current portion of federal coal lease obligations	379
Other liabilities	2,195	2,435
Total current liabilities	101,658	110,509
Noncurrent liabilities
Senior notes	0	0
Federal coal lease obligations, net of current portion	1,404
Asset retirement obligations, net of current portion	100,817	99,297
Accumulated postretirement medical benefit obligation, net of current portion	25,303	24,958
Royalties And Production Taxes Noncurrent	28,592	21,896
Other liabilities	6,996	8,917
Total liabilities	264,770	265,577
Total equity	1,244,530	1,284,473
Total liabilities and equity	1,509,300	1,550,050
Non-Guarantor Subsidiaries | Reportable Legal Entities [Member]
Current assets
Cash and cash equivalents	0	0
Accounts receivable	24,484	32,716
Due from related parties	0	0
Inventories, net	0	0
Income tax receivable	0	0
Other prepaid and deferred charges	0	0
Other assets	0	0
Total current assets	24,484	32,716
Noncurrent assets
Property, plant and equipment, net	0	0
Goodwill	0	0
Income tax receivable	0	0
Other assets	299	341
Total assets	24,783	33,057
Current liabilities
Accounts payable	60	59
Royalties and production taxes	0	0
Accrued expenses	0	0
Due to related parties	16,959	25,162
Current portion of federal coal lease obligations	0
Other liabilities	0	0
Total current liabilities	17,019	25,221
Noncurrent liabilities
Senior notes	0	0
Federal coal lease obligations, net of current portion	0
Asset retirement obligations, net of current portion	0	0
Accumulated postretirement medical benefit obligation, net of current portion	0	0
Royalties And Production Taxes Noncurrent	0	0
Other liabilities	0	0
Total liabilities	17,019	25,221
Total equity	7,764	7,836
Total liabilities and equity	$ 24,783	$ 33,057

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Supplemental Guarantor/Non-Guarantor Financial Information (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from continuing operations
Net cash provided by (used in) operating activities	$ 24,076	$ 19,695
Investing activities
Purchases of property, plant and equipment	(2,646)	(4,124)
Investment in development projects	(360)	0
Other	0	0
Net cash provided by (used in) investing activities	(3,006)	(4,124)
Financing activities
Repayment of senior notes	0	(62,094)
Principal payments on federal coal leases	574	0
Payment of debt refinancing costs	0	(402)
Payment of debt restructuring costs	0	(40)
Proceeds from issuance of common stock	0	68,850
Cash paid for equity offering	0	(4,434)
Other	(648)	(644)
Net cash provided by (used in) financing activities	(1,222)	1,236
Net increase (decrease) in cash, cash equivalents, and restricted cash	19,848	16,807
Cash, cash equivalents, and restricted cash at beginning of period	108,673	84,433
Cash, cash equivalents, and restricted cash at end of period	128,521	101,240
Parent Guarantor (CPE Inc.) | Reportable Legal Entities [Member]
Cash flows from continuing operations
Net cash provided by (used in) operating activities	0	0
Investing activities
Purchases of property, plant and equipment	0	0
Investment in development projects	0
Net cash provided by (used in) investing activities	0	0
Financing activities
Repayment of senior notes		0
Principal payments on federal coal leases	0
Payment of debt refinancing costs		0
Payment of debt restructuring costs		0
Proceeds from issuance of common stock		0
Cash paid for equity offering		0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0	0
Cash, cash equivalents, and restricted cash at end of period	0	0
Issuers | Reportable Legal Entities [Member]
Cash flows from continuing operations
Net cash provided by (used in) operating activities	19,898	14,437
Investing activities
Purchases of property, plant and equipment	(31)	(386)
Investment in development projects	0
Net cash provided by (used in) investing activities	(31)	(386)
Financing activities
Repayment of senior notes		(62,094)
Principal payments on federal coal leases	0
Payment of debt refinancing costs		0
Payment of debt restructuring costs		(40)
Proceeds from issuance of common stock		68,850
Cash paid for equity offering		(4,434)
Other	0	0
Net cash provided by (used in) financing activities	0	2,282
Net increase (decrease) in cash, cash equivalents, and restricted cash	19,867	16,333
Cash, cash equivalents, and restricted cash at beginning of period	107,818	83,673
Cash, cash equivalents, and restricted cash at end of period	127,684	100,006
Guarantor Subsidiaries | Reportable Legal Entities [Member]
Cash flows from continuing operations
Net cash provided by (used in) operating activities	4,178	4,856
Investing activities
Purchases of property, plant and equipment	(2,615)	(3,738)
Investment in development projects	(360)
Net cash provided by (used in) investing activities	(2,975)	(3,738)
Financing activities
Repayment of senior notes		0
Principal payments on federal coal leases	574
Payment of debt refinancing costs		0
Payment of debt restructuring costs		0
Proceeds from issuance of common stock		0
Cash paid for equity offering		0
Other	(648)	(644)
Net cash provided by (used in) financing activities	(1,222)	(644)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(19)	474
Cash, cash equivalents, and restricted cash at beginning of period	856	760
Cash, cash equivalents, and restricted cash at end of period	836	1,234
Non-Guarantor Subsidiaries | Reportable Legal Entities [Member]
Cash flows from continuing operations
Net cash provided by (used in) operating activities	0	402
Investing activities
Purchases of property, plant and equipment	0	0
Investment in development projects	0
Net cash provided by (used in) investing activities	0	0
Financing activities
Repayment of senior notes		0
Principal payments on federal coal leases	0
Payment of debt refinancing costs		(402)
Payment of debt restructuring costs		0
Proceeds from issuance of common stock		0
Cash paid for equity offering		0
Other	0	0
Net cash provided by (used in) financing activities	0	(402)
Net increase (decrease) in cash, cash equivalents, and restricted cash	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0	0
Cash, cash equivalents, and restricted cash at end of period	$ 0	$ 0