10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended March 31, 2019

OR

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

For the transition period from ________________to________________

Commission File No.:  0-26823

ALLIANCE RESOURCE PARTNERS, L.P.

(Exact name of registrant as specified in its charter)

Delaware	73-1564280
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

1717 South Boulder Avenue, Suite 400, Tulsa, Oklahoma 74119

(Address of principal executive offices and zip code)

(918) 295-7600

(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   [   ] No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).  [X ] Yes   [   ] 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.

Large Accelerated Filer [X]	Accelerated Filer [   ]	Non-Accelerated Filer [   ]	Smaller Reporting Company [   ]
Emerging Growth Company [   ]

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. [   ]

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

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common units representing limited partner interests	ARLP	NASDAQ Global Select Market

As of May 6, 2019, 128,391,191 common units are outstanding.

TABLE OF CONTENTS

		Page
ITEM 1.	Financial Statements (Unaudited)
	ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES
	Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018	1
	Condensed Consolidated Statements of Income for the three months ended March 31, 2019 and 2018	2
	Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2019 and 2018	3
	Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2019 and 2018	4
	Notes to Condensed Consolidated Financial Statements	5
	1.     Organization and Presentation	5
	2.     New Accounting Standards	6
	3.     Acquisition	7
	4.     Contingencies	8
	5.     Inventories	9
	6.     Leases	9
	7.     Fair Value Measurements	10
	8.     Long-Term Debt	11
	9.     Variable Interest Entities	12
	10.   Investments	14
	11.   Partners' Capital	15
	12.   Revenue from Contracts with Customers	16
	13.   Net Income of ARLP per Limited Partner Unit	17
	14.   Workers' Compensation and Pneumoconiosis	18
	15.   Compensation Plans	19
	16.   Components of Pension Plan Net Periodic Benefit Cost	20
	17.   Segment Information	21
	18.   Subsequent Events	23
ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	24
ITEM 3.	Quantitative and Qualitative Disclosures about Market Risk	34
ITEM 4.	Controls and Procedures	35
	Forward-Looking Statements	36
PART II
OTHER INFORMATION
ITEM 1.	Legal Proceedings	38
ITEM 1A.	Risk Factors	38
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	38
ITEM 3.	Defaults Upon Senior Securities	38
ITEM 4.	Mine Safety Disclosures	39
ITEM 5.	Other Information	39
ITEM 6.	Exhibits	40

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PART I

FINANCIAL INFORMATION

ITEM 1.    FINANCIAL STATEMENTS

ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except unit data)

(Unaudited)

	March 31,		December 31,
	2019		2018
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	30,192	$	244,150
Trade receivables		194,538		174,914
Other receivables		2,108		395
Due from affiliates		16		17
Inventories, net		85,440		59,206
Advance royalties, net		1,630		1,274
Prepaid expenses and other assets		15,811		20,730
Total current assets		329,735		500,686
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost		3,474,573		2,925,808
Less accumulated depreciation, depletion and amortization		(1,579,588)		(1,513,450)
Total property, plant and equipment, net		1,894,985		1,412,358
OTHER ASSETS:
Advance royalties, net		53,499		42,923
Equity method investments		28,770		161,309
Equity securities		—		122,094
Goodwill		136,399		136,399
Operating lease right-of-use assets		22,508		—
Other long-term assets		19,234		18,979
Total other assets		260,410		481,704
TOTAL ASSETS	$	2,485,130	$	2,394,748
LIABILITIES AND PARTNERS' CAPITAL
CURRENT LIABILITIES:
Accounts payable	$	112,684	$	96,397
Due to affiliates		66		816
Accrued taxes other than income taxes		18,484		16,762
Accrued payroll and related expenses		38,896		43,113
Accrued interest		12,509		5,022
Workers' compensation and pneumoconiosis benefits		11,268		11,137
Current finance lease obligations		40,894		46,722
Current operating lease obligations		6,911		—
Other current liabilities		17,429		18,902
Current maturities, long-term debt, net		90,000		92,000
Total current liabilities		349,141		330,871
LONG-TERM LIABILITIES:
Long-term debt, excluding current maturities, net		414,771		564,004
Pneumoconiosis benefits		72,922		68,828
Accrued pension benefit		41,917		43,135
Workers' compensation		40,428		41,669
Asset retirement obligations		131,905		127,655
Long-term finance lease obligations		9,082		10,595
Long-term operating lease obligations		15,462		—
Other liabilities		21,393		20,304
Total long-term liabilities		747,880		876,190
Total liabilities		1,097,021		1,207,061
PARTNERS' CAPITAL:
Alliance Resource Partners, L.P. ("ARLP") Partners' Capital:
Limited Partners - Common Unitholders 128,391,191 and 128,095,511 units outstanding, respectively		1,426,360		1,229,268
Accumulated other comprehensive loss		(50,455)		(46,871)
Total ARLP Partners' Capital		1,375,905		1,182,397
Noncontrolling interest		12,204		5,290
Total Partners' Capital		1,388,109		1,187,687
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$	2,485,130	$	2,394,748

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except unit and per unit data)

(Unaudited)

	Three Months Ended
	March 31,
	2019		2018
SALES AND OPERATING REVENUES:
Coal sales	$	476,016	$	423,610
Royalty revenues		10,728		—
Transportation revenues		30,238		19,785
Other sales and operating revenues		9,620		13,727
Total revenues		526,602		457,122
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)		302,728		277,238
Transportation expenses		30,238		19,785
Outside coal purchases		—		1,374
General and administrative		17,812		16,651
Depreciation, depletion and amortization		71,139		61,848
Settlement gain		—		(80,000)
Total operating expenses		421,917		296,896
INCOME FROM OPERATIONS		104,685		160,226
Interest expense (net of interest capitalized for the three months ended March 31, 2019 and 2018 of $254 and $265, respectively)		(11,422)		(10,858)
Interest income		91		65
Equity method investment income		324		3,736
Equity securities income		12,906		3,724
Acquisition gain		177,043		—
Other expense		(129)		(847)
INCOME BEFORE INCOME TAXES		283,498		156,046
INCOME TAX BENEFIT		(106)		(10)
NET INCOME		283,604		156,056
LESS:  NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST		(7,176)		(148)
NET INCOME ATTRIBUTABLE TO ALLIANCE RESOURCE PARTNERS, L.P. ("NET INCOME OF ARLP")	$	276,428	$	155,908
GENERAL PARTNER'S INTEREST IN NET INCOME OF ARLP	$	—	$	1,560
LIMITED PARTNERS' INTEREST IN NET INCOME OF ARLP	$	276,428	$	154,348
BASIC AND DILUTED NET INCOME OF ARLP PER LIMITED PARTNER UNIT	$	2.12	$	1.16
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING – BASIC AND DILUTED		128,149,791		130,819,217

See notes to condensed consolidated financial statements.

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ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2019		2018
NET INCOME	$	283,604	$	156,056
OTHER COMPREHENSIVE INCOME (LOSS):
Defined benefit pension plan
Amortization of prior service cost (1)		47		47
Amortization of net actuarial loss (1)		979		969
Total defined benefit pension plan adjustments		1,026		1,016
Pneumoconiosis benefits
Net actuarial loss		(3,465)		—
Amortization of net actuarial loss (gain) (1)		(1,145)		1
Total pneumoconiosis benefits adjustments		(4,610)		1
OTHER COMPREHENSIVE INCOME (LOSS)		(3,584)		1,017
COMPREHENSIVE INCOME		280,020		157,073
Less: Comprehensive income attributable to noncontrolling interest		(7,176)		(148)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP	$	272,844	$	156,925

(1) Amortization of prior service cost and net actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 14 and 16 for additional details).

See notes to condensed consolidated financial statements.

3

ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended
	March 31,
	2019		2018
CASH FLOWS FROM OPERATING ACTIVITIES	$	143,706	$	224,178
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant and equipment:
Capital expenditures		(84,043)		(51,525)
Increase (decrease) in accounts payable and accrued liabilities		6,470		(15)
Proceeds from sale of property, plant and equipment		103		7
Contributions to equity method investments		—		(11,400)
Distributions received from investments in excess of cumulative earnings		2,260		736
Payment for acquisition of business, net of cash acquired		(175,060)		—
Cash received from redemption of equity securities		134,288		—
Net cash used in investing activities		(115,982)		(62,197)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under securitization facility		108,000		37,600
Payments under securitization facility		(110,000)		(70,000)
Borrowings under revolving credit facilities		—		70,000
Payments under revolving credit facilities		(150,000)		(100,000)
Payments on finance lease obligations		(7,341)		(6,974)
Payments for purchases of units under unit repurchase program		(5,251)		—
Net settlement of withholding taxes on issuance of units in deferred compensation plans		(7,817)		(2,081)
Cash contribution by General Partner		—		41
Distributions paid to Partners		(69,011)		(68,396)
Other		(262)		(163)
Net cash used in financing activities		(241,682)		(139,973)
NET CHANGE IN CASH AND CASH EQUIVALENTS		(213,958)		22,008
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD		244,150		6,756
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	30,192	$	28,764
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	$	3,240	$	2,995
NON-CASH INVESTING AND FINANCING ACTIVITY:
Accounts payable for purchase of property, plant and equipment	$	21,055	$	15,621
Assets acquired by finance lease	$	—	$	835
Right-of-use assets acquired by operating lease	$	25,179	$	—
Market value of common units issued under deferred compensation plans before tax withholding requirements	$	17,415	$	6,142
Acquisition of business:
Fair value of assets assumed	$	484,303	$	—
Previously held equity-method investments		(307,322)		—
Cash paid, net of cash acquired		(175,060)		—
Fair value of liabilities assumed	$	1,921	$	—

See notes to condensed consolidated financial statements.

4

ALLIANCE RESOURCE PARTNERS, L.P. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.ORGANIZATION AND PRESENTATION

Significant Relationships Referenced in Notes to Condensed Consolidated Financial Statements

· References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

· References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

· References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner. 

· References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

· References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land-holding company for the mining operations of Alliance Resource Operating Partners, L.P.

· References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for the coal mining operations of Alliance Resource Operating Partners, L.P.

Organization

ARLP is a Delaware limited partnership listed on the NASDAQ Global Select Market under the ticker symbol "ARLP."  ARLP was formed in May 1999 and completed its initial public offering on August 19, 1999 when it acquired substantially all of the coal production and marketing assets of Alliance Resource Holdings, Inc., a Delaware corporation, and its subsidiaries.  We are managed by our general partner, MGP, a Delaware limited liability company which holds a non-economic general partner interest in ARLP. 

AllDale I & II Acquisition

On January 3, 2019 (the "Acquisition Date"), we acquired all of the limited partner interests not owned by Cavalier Minerals JV, LLC ("Cavalier Minerals") in AllDale Minerals LP ("AllDale I") and AllDale Minerals II, LP ("AllDale II", and collectively with AllDale I, "AllDale I & II") and the general partner interests in AllDale I & II (the "Acquisition").  As a result of the Acquisition and our previous investments held through Cavalier Minerals, we now control approximately 43,000 net royalty acres in premier oil & gas resource plays.   The Acquisition provides us with diversified exposure to industry leading operators and is consistent with our general business strategy to pursue accretive acquisitions. See Note 3 – Acquisition for more information.

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of March 31, 2019 and December 31, 2018 and the results of our operations, comprehensive income and cash flows for the three months ended March 31, 2019 and 2018.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all of the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 and particularly as it relates to the simplification transactions completed by the Partnership on May 31, 2018 ("Simplification Transactions").

5

For the periods presented prior to the Simplification Transactions, completed on May 31, 2018, MGP's previous interests in both Alliance Coal and the Intermediate Partnership are reported as part of the general partner's interest in the ARLP Partnership's condensed consolidated financial statements. 

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2019.

Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

Leases

We lease buildings and equipment under operating lease agreements that provide for the payment of minimum rentals.  We also have noncancelable lease agreements with third parties for land and equipment under finance lease obligations.  Some of our arrangements within these agreements have both lease and non-lease components, which are generally accounted for separately.  We have elected a practical expedient to account for lease and non-lease components as a single lease component for leases of buildings and office equipment.  Our leases have lease terms of one year to 20 years, some of which include automatic renewals up to ten years which are likely to be exercised, and some of which include options to terminate the lease within one year.  We also hold numerous mineral reserve leases with both related parties as well as third parties, none of which are accounted for as an operating lease or as a finance lease. 

We review each agreement to determine if an arrangement within the agreement contains a lease at the inception of an arrangement.  Once an arrangement is determined to contain either an operating or finance lease with a term greater than 12 months, we recognize a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying asset for the lease term based on the present value of lease payments over the lease term. The lease term includes all noncancelable periods defined in the lease as well as periods covered by options to extend the lease that we are reasonably certain to exercise.  As an implicit borrowing rate cannot be determined under most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

Expenses related to leases determined to be operating leases will be recognized on a straight-line basis over the lease term including any reasonably assured renewal periods, while those determined to be finance leases will be recognized following a front-loaded expense profile in which interest and amortization are presented separately in the income statement.  The determination of whether a lease is accounted for as a finance lease or an operating lease requires management to make estimates primarily about the fair value of the asset and its estimated economic useful life. 

2.NEW ACCOUNTING STANDARDS

New Accounting Standards Issued and Adopted

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842) ("ASU 2016-02").  ASU 2016-02 requires lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet and disclose key information about lease arrangements. Leases are now classified as either finance or operating, with the resulting classification affecting the pattern of expense recognition in the income statement.  We elected to use the modified retrospective transition method which allows a cumulative effect adjustment on the balance sheet upon adoption. The adoption of the standard resulted in the recognition of approximately $25.0 million in additional net lease assets and respective lease liabilities as of January 1, 2019. 

As part of our transition there are a number of practical expedients available in the new standard.  We elected a package of practical expedients that, among other things, allows us to not reassess the lease classification of expired or existing leases. In addition to the package of practical expedients, we also elected to use a practical expedient allowing us to use hindsight in determining the lease term for existing leases.

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New Accounting Standards Issued and Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13").  ASU 2016-13 changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking "expected loss" model that generally will result in earlier recognition of allowances for losses.  The new standard will require disclosure of significantly more information related to these items.  ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for the fiscal year beginning after December 15, 2018, including interim periods.  We do not have a history of credit losses on our financial instruments, accordingly we do not anticipate ASU 2016-13 will have a material impact on our condensed consolidated financial statements.    

3.ACQUISITION

On the Acquisition Date,  we acquired all of the limited partner interests not owned by Cavalier Minerals in AllDale I & II and the general partner interests in AllDale I & II for $176.0 million, which was funded with cash on hand and borrowings under the Revolving Credit Facility discussed in Note 8 – Long-Term Debt.  As a result of the Acquisition and our previous investments held through Cavalier Minerals, we now control approximately 43,000 net royalty acres strategically positioned in the core of the Anadarko (SCOOP/STACK), Permian (Delaware and Midland), Williston (Bakken) and Appalachian basins. The Acquisition provides us with diversified exposure to industry leading operators and is consistent with our general business strategy to pursue accretive acquisitions. 

Because the underlying mineral interests held by AllDale I & II include royalty interests in producing properties, we have determined that the Acquisition should be accounted for as a business combination and the underlying assets and liabilities of AllDale I & II should be recorded at their Acquisition Date fair value on our condensed consolidated balance sheet.

The total fair value of the cash paid in the Acquisition and our previous investments were as follows:

	As of January 3, 2019
	(in thousands)
Cash	$	175,960
Previously held investments		307,322
Total	$	483,282

Prior to the Acquisition Date, we accounted for our investments in AllDale I & II, held through Cavalier Minerals, as equity method investments. The combined fair value of our equity method investments on the Acquisition Date was $307.3 million.  We re-measured our equity method investments, which had an aggregate carrying value of $130.3 million immediately prior to the Acquisition using an income approach primarily comprised of a discounted cash flow model.  The re-measurement resulted in a gain of $177.0 million which is recorded in the Acquisition gain line item in our condensed consolidated statements of income. The assumptions used in the determination of the fair value measurement include estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions are not observable in active markets and therefore the re-measurement of our equity method investments represents a Level 3 fair value measurement.

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The following table summarizes the fair value allocation of assets acquired and liabilities assumed as of the Acquisition Date:

	As of January 3, 2019
	(in thousands)
Cash and cash equivalents	$	900
Mineral interests		473,701
Receivables		10,602
Accounts payable		(1,921)
Net assets acquired	$	483,282

We determined the fair value of the mineral interests using an income approach. The income approach primarily includes the development of an entity-wide value using discounted expected cash flows based on estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions used are not observable in active markets, therefore the fair value measurement of the mineral interests represents a Level 3 fair value measurement.  AllDale I & II's carrying value of the receivables and accounts payable represent their fair value given their short-term nature.

Our previous equity method investments in AllDale I & II were held through Cavalier Minerals.  Bluegrass Minerals continues to hold a 4% membership interest (the "Bluegrass Interest") as well as a profits interest in Cavalier Minerals as it did before the Acquisition.  This Bluegrass Interest represents an indirect noncontrolling interest in AllDale I & II.  The Acquisition Date fair value of the Bluegrass Interest was $12.3 million.  The fair value was determined using estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions used are not observable in active markets, therefore the fair value measurement represents a Level 3 fair value measurement.

The amounts of revenue and earnings, exclusive of the acquisition gain, of AllDale I & II included in our condensed consolidated statements of income from the Acquisition Date through March 31, 2019 are as follows:

	(in thousands)
Revenue	$	10,728
Net income		4,081

The following represents the pro forma revenues and net income for the three months ended March 31, 2018 as if AllDale I & II had been included in our consolidated results since January 1, 2018.  These amounts have been calculated after applying our accounting policies.  Pro forma information is not necessary for the three months ended March 31, 2019 as the Acquisition occurred at the beginning of the year.  Additionally, our results have been adjusted to remove the effect of our past equity method investments in AllDale I & II.

	Three Months Ended
	March 31,
	2018
	(in thousands)
Total revenues
As reported	$	457,122
Pro forma		464,881
Net income
As reported	$	156,056
Pro forma		155,583

4.CONTINGENCIES

Various lawsuits, claims and regulatory proceedings incidental to our business are pending against the ARLP Partnership.  We record accruals for potential losses related to these matters when, in management's opinion, such losses are probable and reasonably estimable.  Based on known facts and circumstances, we believe the ultimate outcome of

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these outstanding lawsuits, claims and regulatory proceedings will not have a material adverse effect on our financial condition, results of operations or liquidity.  However, if the results of these matters were different from management's current opinion and in amounts greater than our accruals, then they could have a material adverse effect.

5.INVENTORIES

Inventories consist of the following:

	March 31,		December 31,
	2019		2018
	(in thousands)
Coal	$	47,265	$	20,929
Supplies (net of reserve for obsolescence of $5,041 and $5,453, respectively)		38,175		38,277
Total inventories, net	$	85,440	$	59,206

6.LEASES

The components of lease expense were as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Finance lease cost:
Amortization of right-of-use assets	$	4,521
Interest on lease liabilities		714
Operating lease cost		3,009
Short-term lease cost		190
Variable lease cost		332
Total lease cost	$	8,766

Supplemental cash flow information related to leases was as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,966
Operating cash flows for finance leases	$	714
Financing cash flows for finance leases	$	7,341
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	25,179

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Supplemental balance sheet information related to leases was as follows:

	March 31,		December 31,
	2019		2018
	(in thousands)
Finance leases:
Property and equipment finance lease assets, gross	$	141,019	$	141,019
Accumulated depreciation		(79,097)		(74,576)
Property and equipment finance lease assets, net	$	61,922	$	66,443

	March 31,
	2019
Weighted average remaining lease term
Operating leases		11.1 years
Finance leases		1 year
Weighted average discount rate
Operating leases		6.0	%
Finance leases		5.2	%

Maturities of lease liabilities as of March 31, 2019 were as follows:

	Operating leases		Finance leases
	(in thousands)
2019	$	6,120	$	40,754
2020		3,788		8,748
2021		2,236		913
2022		2,172		913
2023		1,995		140
Thereafter		14,864		560
Total lease payments		31,175		52,028
Less imputed interest		(8,802)		(2,052)
Total	$	22,373	$	49,976

7.FAIR VALUE MEASUREMENTS

The following table summarizes our fair value measurements within the hierarchy:

	March 31, 2019						December 31, 2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	541,274	$	—	$	—	$	669,864	$	—
Total	$	—	$	541,274	$	—	$	—	$	669,864	$	—

The carrying amounts for cash equivalents, accounts receivable, accounts payable, accrued and other liabilities, due from affiliates and due to affiliates approximate fair value due to the short maturity of those instruments.

The estimated fair value of our long-term debt, including current maturities, is based on interest rates that we believe are currently available to us in active markets for issuance of debt with similar terms and remaining maturities (See Note 8 – Long-Term Debt).  The fair value of debt, which is based upon these interest rates, is classified as a Level 2 measurement under the fair value hierarchy.

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8.LONG-TERM DEBT

Long-term debt consists of the following:

					Unamortized Discount and
	Principal				Debt Issuance Costs
	March 31,		December 31,		March 31,		December 31,
	2019		2018		2019		2018
	(in thousands)
Revolving credit facility	$	25,000	$	175,000	$	(4,665)	$	(5,203)
Senior notes		400,000		400,000		(5,564)		(5,793)
Securitization facility		90,000		92,000		—		—
		515,000		667,000		(10,229)		(10,996)
Less current maturities		(90,000)		(92,000)		—		—
Total long-term debt	$	425,000	$	575,000	$	(10,229)	$	(10,996)

Credit Facility.  On January 27, 2017, our Intermediate Partnership entered into a Fourth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $494.75 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of May 23, 2021. 

The Credit Agreement is guaranteed by all of the material direct and indirect subsidiaries of our Intermediate Partnership, and is secured by substantially all of the Intermediate Partnership's assets.  Borrowings under the Revolving Credit Facility bear interest, at the option of the Intermediate Partnership, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 4.85% as of March 31, 2019.  At March 31, 2019, we had $9.3 million of letters of credit outstanding with $460.5 million available for borrowing under the Revolving Credit Facility. We currently incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments. 

The Credit Agreement contains various restrictions affecting our Intermediate Partnership and its subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, in each case subject to various exceptions, and the payment of cash distributions by our Intermediate Partnership if such payment would result in a certain fixed charge coverage ratio (as defined in the Credit Agreement).  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0 and (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0, in each case, during the four most recently ended fiscal quarters.  The debt to cash flow ratio and cash flow to interest expense ratio were 0.81 to 1.0 and 16.6 to 1.0, respectively, for the trailing twelve months ended March 31, 2019.  We remain in compliance with the covenants of the Credit Agreement as of March 31, 2019. 

Senior Notes.  On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation(as co-issuer), a wholly owned subsidiary of the Intermediate Partnership("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem up to 35% of the aggregate principal amount of the Senior Notes with the net cash proceeds of one or more equity offerings at a redemption price equal to 107.5% of the principal amount redeemed, plus accrued and unpaid interest, if any, to the redemption date.  The issuers of the Senior Notes may also redeem all or a part of the notes at any time on or after May 1, 2020, at redemption prices set forth in the indenture governing the Senior Notes.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem the Senior Notes at a redemption price equal to the principal amount of the Senior Notes plus a "make-whole" premium, plus accrued and unpaid interest, if any, to the redemption date. 

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Accounts Receivable Securitization.  On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  It was renewed in January 2019 and matures in January 2020. At March 31, 2019, we had $90.0 million outstanding balance under the Securitization Facility. 

Cavalier Credit Agreement.  On October 6, 2015, Cavalier Minerals (see Note 9 – Variable Interest Entities) entered into a credit agreement (the "Cavalier Credit Agreement") with Mineral Lending, LLC ("Mineral Lending") for a $100.0 million line of credit (the "Cavalier Credit Facility").  The commitment under the Cavalier Credit Facility is reduced by any distributions received from Cavalier Minerals' investment in AllDale II. As of March 31, 2019, the commitment under the Cavalier Credit Facility was $68.2 million.  Mineral Lending is an entity owned by (a) Alliance Resource Holdings II, Inc. ("ARH II"), an entity owned by Joseph W. Craft III, the Chairman, President and Chief Executive Officer of MGP ("Mr. Craft") and Kathleen S. Craft, (b) an entity owned by an individual who is an officer and director of ARH II ("ARH Officer") and (c) charitable foundations established by Mr. Craft and Kathleen S. Craft.  There is no commitment fee under the facility.  Mineral Lending's obligation to make the line of credit available terminates no later than October 6, 2019.  Borrowings under the Cavalier Credit Facility bear interest at a one month LIBOR rate plus 6% with interest payable quarterly, and mature on September 30, 2024, at which time all amounts then outstanding are required to be repaid. The Cavalier Credit Agreement requires repayment of the principal balance beginning in 2018, in quarterly payments of an amount equal to the greater of $1.3 million initially, escalated to $2.5 million after two years, or fifty percent of Cavalier Minerals' excess cash flow. To secure payment of the facility, Cavalier Minerals pledged all of its partnership interests, owned or later acquired, in AllDale I & II.  Cavalier Minerals may prepay the Cavalier Credit Facility at any time in whole or in part subject to terms and conditions described in the Cavalier Credit Agreement.  As of March 31, 2019, Cavalier Minerals had not drawn on the Cavalier Credit Facility.

9.VARIABLE INTEREST ENTITIES

Cavalier Minerals

On November 10, 2014, our subsidiary, Alliance Minerals, and Bluegrass Minerals Management, LLC ("Bluegrass Minerals") entered into a limited liability company agreement (the "Cavalier Agreement") to create Cavalier Minerals, which was formed to indirectly acquire oil & gas mineral interests through its ownership in AllDale I & II.  Alliance Minerals' ownership interest in Cavalier Minerals is 96%.  Bluegrass Minerals owns a 4% membership interest in Cavalier Minerals and a profits interest which entitles it to receive distributions equal to 25% of all distributions (including in liquidation) after all members have recovered their investment.  Distributions with respect to Bluegrass Minerals' profits interest will be offset by all distributions received by Bluegrass Minerals from the former general partners of AllDale I & II.    Bluegrass Minerals was Cavalier Minerals' managing member prior to the Acquisition (see Note 3 – Acquisition).  In conjunction with the Acquisition, we became the managing member in Cavalier Minerals.  Total contributions to and cumulative distributions from Cavalier Minerals are as follows: 

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		57,385		2,391

We have concluded that Cavalier Minerals is a variable interest entity ("VIE") which we consolidate as the primary beneficiary because we are the managing member and a substantial equity owner in Cavalier Minerals.  Bluegrass Minerals' equity ownership of Cavalier Minerals is accounted for as noncontrolling ownership interest in our condensed consolidated balance sheets.  In addition, earnings attributable to Bluegrass Minerals are recognized as noncontrolling interest in our condensed consolidated statements of income.

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AllDale I & II

As a result of the Acquisition, we now own 100% of the general partner interests and, including the limited partner interests we hold indirectly through our ownership in Cavalier Minerals, approximately 97% of the limited partner interests in AllDale I & II.  See Note 3 – Acquisition for more information on the Acquisition.  As the general partner of AllDale I & II, we are entitled to receive 20.0% of all distributions from AllDale I & II with the remaining 80.0% allocated to limited partners based upon ownership percentages.

Since AllDale I & II are structured as limited partnerships with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale I & II are VIEs.  We consolidate AllDale I & II as the primary beneficiary because we have the power to direct the activities that most significantly impact AllDale I & II's economic performance in addition to substantial equity ownership.

The following table presents the carrying amounts and classification of AllDale I & II's assets and liabilities included in our condensed consolidated balance sheets:

	March 31,
	2019
Assets (liabilities):	(in thousands)
Cash and cash equivalents	$	3,338
Trade receivables		7,474
Other receivables		1,415
Total property, plant and equipment, net		468,815
Other long-term assets		213
Accounts payable		(1,357)
Due to affiliates		(45)

AllDale III

In February 2017, Alliance Minerals committed to directly invest $30.0 million in AllDale Minerals III, LP ("AllDale III") which was created for similar investment purposes as AllDale I & II.  Alliance Minerals completed funding of this commitment in 2018.Alliance Minerals' limited partner interest in AllDale III at March 31, 2019 was 13.9%.

The AllDale III Partnership Agreement includes a 25% profits interest for the general partner, subject to a return hurdle equal to the greater of 125% of cumulative capital contributions and a 10% internal rate of return, and following an 80/20 "catch-up" provision for the general partner.  AllDale III distributed $0.5 million and $0.4 million to Alliance Minerals during the three months ended March 31, 2019 and 2018, respectively.

Since AllDale III is structured as a limited partnership with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale III is a VIE.We are not the primary beneficiary of AllDale III as we do not have the power to direct the activities that most significantly impact AllDale III's economic performance.  We account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.

WKY CoalPlay

On November 17, 2014, SGP Land, LLC ("SGP Land"), an indirect, wholly owned subsidiary of ARH II, and two limited liability companies ("Craft Companies") owned by irrevocable trusts established by Mr. Craft, entered into a limited liability company agreement to form WKY CoalPlay, LLC ("WKY CoalPlay").  WKY CoalPlay was formed, in part, to purchase and lease coal reserves.  WKY CoalPlay is managed by the ARH Officer discussed in Note 8 – Long-Term Debt, who is also a trustee of the irrevocable trusts owning the Craft Companies.  In December 2014 and February 2015, we entered into various coal reserve leases with WKY CoalPlay.  During the three months ended March 31, 2019, we paid $10.8 million of advanced royalties to WKY CoalPlay.   

We have concluded that WKY CoalPlay is a VIE because of our ability to exercise options to acquire reserves under lease with WKY CoalPlay, which is not within the control of the equity holders and, if it occurs, could potentially limit the expected residual return to the owners of WKY CoalPlay.  We do not have any economic or governance rights

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related to WKY CoalPlay and our options that provide us with a variable interest in WKY CoalPlay's reserve assets do not give us any rights that constitute power to direct the primary activities that most significantly impact WKY CoalPlay's economic performance.  SGP Land has the sole ability to replace the manager of WKY CoalPlay at its discretion and therefore has power to direct the activities of WKY CoalPlay.  Consequently, we concluded that SGP Land is the primary beneficiary of WKY CoalPlay.

10.INVESTMENTS

AllDale III

As discussed in Note 9 – Variable Interest Entities, we account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.  The changes in our equity method investment in AllDale III for each of the periods presented were as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	28,974	$	14,182
Contributions		—		11,400
Equity method investment income		324		42
Distributions received		(528)		(375)
Ending balance	$	28,770	$	25,249

Kodiak

On July 19, 2017, Alliance Minerals purchased $100 million of Series A-1 Preferred Interests from Kodiak Gas Services, LLC ("Kodiak"), a privately-held company providing large-scale, high-utilization gas compression assets to customers operating primarily in the Permian Basin.  This structured investment provided us with a quarterly cash or payment-in-kind return.  We accounted for our ownership interests in Kodiak as equity securities without readily determinable fair values.  On February 8, 2019, Kodiak redeemed our preferred interest for $135.0 million in cash resulting in an $11.5 million gain due to an early redemption premium. The gain is included in the Equity securities income line item.  We no longer hold any ownership interests in Kodiak. 

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11.PARTNERS' CAPITAL

Distributions

Distributions paid or declared during 2018 and 2019 were as follows:

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2018	$	0.5100	$	68,396
May 15, 2018		0.5150		69,047
August 14, 2018		0.5200		69,239
November 14, 2018		0.5250		69,220
Total	$	2.0700	$	275,902
February 14, 2019	$	0.5300	$	69,011
May 15, 2019 (1)		0.5350		—
Total	$	1.0650	$	69,011

(1) On April 26, 2019, we declared this quarterly distribution payable on May 15, 2019 to all unitholders of record as of May 8, 2019. 

Unit Repurchase Program

In May 2018, the MGP board of directors approved the establishment of a unit repurchase program authorizing us to repurchase and retire up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  During the three months ended March 31, 2019, we repurchased and retired 300,970 units for $5.3 million.  Since inception of the program, we have repurchased and retired 3,985,045 units at an average unit price of $19.03 for an aggregate purchase price of $75.9 million.  Total units repurchased includes the repurchase and retirement of 35 units representing fractional units as part of the Simplification Transactions which are not part of the unit repurchase program.

Change in Partners' Capital

The following tables present the quarterly change in Partners' Capital for the three months ended March 31, 2019 and 2018:

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Loss		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2019	128,095,511	$	1,229,268	$	(46,871)	$	5,290	$	1,187,687
Comprehensive income:
Net income	—		276,428		—		7,176		283,604
Actuarially determined long-term liability adjustments	—		—		(3,584)		—		(3,584)
Total comprehensive income									280,020
Settlement of deferred compensation plans	596,650		(7,817)		—		—		(7,817)
Purchase of units under unit repurchase program	(300,970)		(5,251)		—		—		(5,251)
Common unit-based compensation	—		2,743		—		—		2,743
Distributions on deferred common unit-based compensation	—		(1,280)		—		—		(1,280)
Distributions from consolidated company to noncontrolling interest	—		—		—		(262)		(262)
Distributions to Partners	—		(67,731)		—		—		(67,731)
Balance at March 31, 2019	128,391,191	$	1,426,360	$	(50,455)	$	12,204	$	1,388,109

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						Accumulated
	Number of	Limited		General		Other
	Limited Partner	Partners'		Partner's		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Capital		Income(Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2018	130,704,217	$	1,183,219	$	14,859	$	(51,940)	$	5,348	$	1,151,486
Comprehensive income:
Net income	—		154,348		1,560		—		148		156,056
Actuarially determined long-term liability adjustments	—		—		—		1,017		—		1,017
Total comprehensive income											157,073
Settlement of deferred compensation plans	199,039		(2,081)		—		—		—		(2,081)
Simplification Transactions fees	—		(1)		—		—		—		(1)
Common unit-based compensation	—		3,006		—		—		—		3,006
Distributions on deferred common unit-based compensation	—		(1,062)		—		—		—		(1,062)
General Partner contribution	—		—		41		—		—		41
Distributions from consolidated company to noncontrolling interest	—		—		—		—		(162)		(162)
Distributions to Partners	—		(66,660)		(674)		—		—		(67,334)
Balance at March 31, 2018	130,903,256	$	1,270,769	$	15,786	$	(50,923)	$	5,334	$	1,240,966

12.REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table illustrates the disaggregation of our revenues by type, including a reconciliation to our segment presentation as presented in Note 17 – Segment Information, for the three months ended March 31, 2019 and 2018.

	Illinois						Other and
	Basin		Appalachia		Minerals		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Coal sales	$	317,270	$	157,453	$	—	$	5,290	$	(3,997)	$	476,016
Royalty revenues		—		—		10,728		—		—		10,728
Transportation revenues		29,238		1,000		—		—		—		30,238
Other sales and operating revenues		541		951		—		12,405		(4,277)		9,620
Total revenues	$	347,049	$	159,404	$	10,728	$	17,695	$	(8,274)	$	526,602
Three Months Ended March 31, 2018
Coal sales	$	276,065	$	145,289	$	—	$	7,711	$	(5,455)	$	423,610
Transportation revenues		18,271		1,514		—		—		—		19,785
Other sales and operating revenues		569		829		—		16,619		(4,290)		13,727
Total revenues	$	294,905	$	147,632	$	—	$	24,330	$	(9,745)	$	457,122

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The following table illustrates the amount of our transaction price for all current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied as of March 31, 2019 and disaggregated by segment and contract duration.

							2022 and
	2019		2020		2021		Thereafter		Total
	(in thousands)
Illinois Basin coal revenues	$	813,839	$	560,253	$	239,355	$	—	$	1,613,447
Appalachia coal revenues		491,491		256,782		41,545		14,687		804,505
Other and Corporate coal revenues		17,349		—		—		—		17,349
Elimination		(13,037)		—		—		—		(13,037)
Total coal revenues (1)	$	1,309,642	$	817,035	$	280,900	$	14,687	$	2,422,264

(1) Coal revenues consists of coal sales and transportation revenues. 

13.NET INCOME OF ARLP PER LIMITED PARTNER UNIT

We utilize the two-class method in calculating basic and diluted earnings per unit ("EPU").  Subsequent to the Simplification Transactions, net income of ARLP is only allocated to limited partners and participating securities under deferred compensation plans.  Prior to the Simplification Transactions, net income of ARLP was allocated to MGP, limited partners and participating securities under deferred compensation plans in accordance with their respective ownership percentages of the ARLP Partnership, after giving effect to any special income or expense allocations. 

Our participating securities under deferred compensation plans include rights to nonforfeitable distributions or distribution equivalents.  Our participating securities are outstanding awards under our Long-Term Incentive Plan ("LTIP") and phantom units in notional accounts under our Supplemental Executive Retirement Plan ("SERP") and the MGP Amended and Restated Deferred Compensation Plan for Directors ("Directors' Deferred Compensation Plan"). 

As a result of the Simplification Transactions, MGP no longer holds economic interests in the Intermediate Partnership or Alliance Coal.  We no longer make distributions or allocate income and losses to MGP in our calculation of EPU.

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The following is a reconciliation of net income of ARLP used for calculating basic and diluted earnings per unit and the weighted-average units used in computing EPU for the three months ended March 31, 2019 and 2018:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands, except per unit data)
Net income of ARLP	$	276,428	$	155,908
Adjustments:
General partner's equity ownership (1)		—		(1,560)
Limited partners' interest in net income of ARLP		276,428		154,348
Less:
Distributions to participating securities		(1,105)		(1,271)
Undistributed earnings attributable to participating securities		(3,522)		(1,548)
Net income of ARLP available to limited partners	$	271,801	$	151,529
Weighted-average limited partner units outstanding – basic and diluted		128,150		130,819
Basic and diluted net income of ARLP per limited partner unit (2)	$	2.12	$	1.16

(1) Amounts for the three months ended March 31, 2019 reflect the impact of the Simplification Transactions which ended net income allocations and quarterly cash distributions to MGP after May 31, 2018.  Prior to the Simplification Transactions, MGP maintained a 1.0001% general partner interest in the Intermediate Partnership and a 0.001% managing member interest in Alliance Coal and thus received quarterly distributions and income and loss allocations during this time period. 

(2) Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,365 and 1,532 for the three months ended March 31, 2019 and 2018 respectively, were considered anti-dilutive under the treasury stock method.    

14.WORKERS' COMPENSATION AND PNEUMOCONIOSIS

The changes in the workers' compensation liability, including current and long-term liability balances, for each of the periods presented were as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	49,539	$	54,439
Accruals increase		1,961		2,641
Payments		(3,473)		(2,797)
Interest accretion		401		363
Ending balance	$	48,428	$	54,646

We limit our exposure to traumatic injury claims by purchasing a high deductible insurance policy that starts paying benefits after deductibles for a claim have been met.  The deductible level may vary by claim year.  Our workers' compensation liability above is presented on a gross basis and does not include our expected receivables on our insurance policy.  Our receivables for traumatic injury claims under this policy as of March 31, 2019 are $8.1 million and are included in Other long-term assets on our condensed consolidated balance sheet.

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Certain of our mine operating entities are liable under state statutes and the Federal Coal Mine Health and Safety Act of 1969, as amended, to pay pneumoconiosis, or black lung, benefits to eligible employees and former employees and their dependents.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Service cost	$	645	$	630
Interest cost (1)		760		635
Net amortization (1)		(1,145)		1
Net periodic benefit cost	$	260	$	1,266

(1) Interest cost and net amortization is included in the Other expense line item within our condensed consolidated statements of income.

15.COMPENSATION PLANS

Long-Term Incentive Plan

We maintain the LTIP for certain employees and officers of MGP and its affiliates who perform services for us.  The LTIP awards are grants of non-vested "phantom" or notional units, also referred to as "restricted units", which upon satisfaction of time and performance-based vesting requirements, entitle the LTIP participant to receive ARLP common units.  Annual grant levels and vesting provisions for designated participants are recommended by the Chairman, President and Chief Executive Officer of MGP, subject to review and approval of the compensation committee of the MGP board of directors (the "Compensation Committee").  Vesting of all grants outstanding is subject to the satisfaction of certain financial tests, which management currently believes is probable.  Grants issued to LTIP participants are expected to cliff vest on January 1st of the third year following issuance of the grants.  We account for forfeitures of non-vested LTIP grants as they occur.  We will settle the non-vested LTIP grants by delivery of ARLP common units, except for the portion of the grants that will satisfy employee tax withholding obligations of LTIP participants.  As provided under the distribution equivalent rights ("DERs") provisions of the LTIP and the terms of the LTIP awards, all non-vested grants include contingent rights to receive quarterly distributions in cash or, at the discretion of the Compensation Committee, phantom units in lieu of cash credited to a bookkeeping account with value, equal to the cash distributions we make to unitholders during the vesting period. 

A summary of non-vested LTIP grants as of and for the three months ended March 31, 2019 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2019	1,828,080	$	17.18	$	31,699
Granted	586,644		19.93
Vested (1)	(885,381)		12.38
Non-vested grants at March 31, 2019	1,529,343		21.01		31,137

(1) During the three months ended March 31, 2019, we issued 596,650 unrestricted common units to the LTIP participants.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.

LTIP expense was $2.4 million and $2.7 million for the three months ended March 31, 2019 and 2018, respectively.  The total obligation associated with the LTIP as of March 31, 2019 was $12.3 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets. As of March 31, 2019, there was $19.8 million in total unrecognized compensation expense related to the non-vested LTIP grants that are expected to vest.  That expense is expected to be recognized over a weighted-average period of 1.8 years.

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After consideration of the January 1, 2019 vesting and subsequent issuance of 596,650 common units, approximately 1.9 million units remain available under the LTIP for issuance in the future, assuming all grants issued in 2019, 2018 and 2017 and currently outstanding are settled with common units without reduction for tax withholding, no future forfeitures occur and DERs continue being paid in cash versus additional phantom units.   

Supplemental Executive Retirement Plan and Directors' Deferred Compensation Plan

We utilize the SERP to provide deferred compensation benefits for certain officers and key employees. All allocations made to participants under the SERP are made in the form of "phantom" ARLP units and SERP distributions will be settled in the form of ARLP common units.  The SERP is administered by the Compensation Committee. 

Our directors participate in the Directors' Deferred Compensation Plan. Pursuant to the Directors' Deferred Compensation Plan, for amounts deferred either automatically or at the election of the director, a notional account is established and credited with notional common units of ARLP, described in the Directors' Deferred Compensation Plan as "phantom" units.  Distributions from the Directors' Deferred Compensation Plan will be settled in the form of ARLP common units.

For both the SERP and Directors' Deferred Compensation Plan, when quarterly cash distributions are made with respect to ARLP common units, an amount equal to such quarterly distribution is credited to each participant's notional account as additional phantom units.  All grants of phantom units under the SERP and Directors' Deferred Compensation Plan vest immediately.

A summary of SERP and Directors' Deferred Compensation Plan activity as of and for the three months ended March 31, 2019 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2019	635,837	$	27.34	$	11,025
Granted	16,817		18.94
Issued	(115,484)		25.20
Phantom units outstanding as of March 31, 2019	537,170		27.54		10,937

Total SERP and Directors' Deferred Compensation Plan expense was $0.4 million for each of the three months ended March 31, 2019 and 2018.  As of March 31, 2019, the total obligation associated with the SERP and Directors' Deferred Compensation Plan was $14.8 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.  During the three months ended March 31, 2019, we provided 115,484 ARLP common units to a director under the Directors' Deferred Compensation Plan.

16.COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

Eligible employees at certain of our mining operations participate in a defined benefit plan (the "Pension Plan") that we sponsor.  The Pension Plan is currently closed to new applicants and participants in the Pension Plan are no longer

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receiving benefit accruals for service.  The benefit formula for the Pension Plan is a fixed dollar unit based on years of service.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Interest cost	$	1,216	$	1,116
Expected return on plan assets		(1,232)		(1,436)
Amortization of prior service cost		47		47
Amortization of net loss		979		969
Net periodic benefit cost (1)	$	1,010	$	696

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

During the three months ended March 31, 2019, we made contribution payments of $1.2 million to the Pension Plan for the 2018 plan year.  In April 2019, we made a contribution payment of $1.1 million for the 2019 plan year.

17.SEGMENT INFORMATION

We operate in the United States as a diversified natural resource company that generates income from the production and marketing of coal to major domestic and international utilities and industrial users as well as income from oil & gas mineral interests.  We aggregate multiple operating segments into three reportable segments, Illinois Basin, Appalachia, and Minerals.  We also have an "all other" category referred to as Other and Corporate.  Our two coal reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues.  The two coal segments include eight mining complexes operating in Illinois, Indiana, Kentucky, Maryland and West Virginia.  We also have a coal loading terminal in Indiana on the Ohio River included in Other and Corporate.  The Minerals reportable segment aggregates our oil & gas mineral interests which are located primarily in the Anadarko (SCOOP/STACK), Permian (Delaware and Midland), Williston (Bakken) and Appalachian basins.  We have no operations within our Minerals reportable segment other than receiving royalties for our oil & gas mineral interests. 

As a result of the Acquisition discussed in Note 3 – Acquisitions, we now control the underlying oil & gas mineral interests held by AllDale I & II.  This control over the oil & gas mineral interests held by AllDale I & II reflects a strategic change in how we manage our business and how resources are allocated by our chief operating decision maker.   Due to this strategic change, we have restructured our reportable segments in the first quarter of 2019 to include our oil & gas mineral interests within a new Minerals reportable segment.  Prior periods have been recast to include our oil & gas minerals interests in the Minerals segment.

The Illinois Basin reportable segment includes currently operating mining complexes (a) Webster County Coal, LLC's Dotiki mining complex, (b) Gibson County Coal, LLC's mining complex, which includes the Gibson North and Gibson South mines, (c) Warrior Coal, LLC's mining complex, (d) River View Coal, LLC's mining complex and (e) Hamilton County Coal, LLC's mining complex.  The Gibson North mine had been idled since the fourth quarter of 2015 in response to market conditions but resumed production in May 2018.

The Illinois Basin reportable segment also includes White County Coal, LLC's Pattiki mining complex, Hopkins County Coal, LLC's mining complex, which includes the Elk Creek mine, the Pleasant View surface mineable reserves and the Fies underground project, Sebree Mining, LLC's mining complex, which includes the Onton mine, Steamport, LLC and certain reserves, CR Services, LLC, CR Machine Shop, LLC, certain properties and equipment of Alliance Resource Properties, ARP Sebree, LLC, ARP Sebree South, LLC and UC Coal, LLC and its subsidiaries, UC Mining, LLC and UC Processing, LLC.   

The Appalachia reportable segment includes currently operating mining complexes (a) Mettiki mining complex, (b) Tunnel Ridge, LLC mining complex and (c) MC Mining, LLC mining complex. The Mettiki mining complex includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant.  The Appalachia reportable segment also includes the Penn Ridge property.

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The Minerals reportable segment includes AllDale I & II, Alliance Royalty, LLC, AllRoy GP, LLC, CavMM, LLC, and Alliance Minerals' equity interests in both AllDale III (Note 10 – Investments) and Cavalier Minerals.

Other and Corporate includes marketing and administrative activities, ASI and its subsidiary, Matrix Design Group, LLC and its subsidiaries Matrix Design International, LLC and Matrix Design Africa (PTY) LTD ("Matrix Design"), Alliance Design Group, LLC ("Alliance Design") (collectively, the Matrix Design entities and Alliance Design are referred to as the "Matrix Group"), ASI's ownership of aircraft, the Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") dock activities, Alliance Coal's coal brokerage activity, Mid-America Carbonates, LLC ("MAC"), Alliance Minerals' equity investment in Kodiak which was redeemed in February 2019 by Kodiak (see Note 10 – Investments), certain of Alliance Resource Properties' land and mineral interest activities, Pontiki Coal, LLC's prior workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC ("Wildcat Insurance"), which assists the ARLP Partnership with its insurance requirements, and AROP Funding and Alliance Finance (both discussed in Note 8 – Long-Term Debt). 

Reportable segment results as of and for the three months ended March 31, 2019 and 2018 are presented below.

	Illinois						Other and		Elimination
	Basin		Appalachia		Minerals		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Revenues - Outside	$	343,052		159,404		10,728		13,418		—	$	526,602
Revenues - Intercompany		3,997		—		—		4,277		(8,274)		—
Total revenues (2)		347,049		159,404		10,728		17,695		(8,274)		526,602
Segment Adjusted EBITDA Expense (3)		195,840		99,749		1,827		11,474		(6,033)		302,857
Segment Adjusted EBITDA (4)		121,971		58,655		9,132		19,127		(2,241)		206,644
Total assets		1,422,086		468,904		510,076		462,696		(378,632)		2,485,130
Capital expenditures (5)		47,928		33,346		—		2,769		—		84,043
Three Months Ended March 31, 2018
Revenues - Outside	$	289,518	$	147,565	$	—	$	20,039	$	—	$	457,122
Revenues - Intercompany		5,387		67		—		4,291		(9,745)		—
Total revenues (2)		294,905		147,632		—		24,330		(9,745)		457,122
Segment Adjusted EBITDA Expense (3)		181,803		92,498		—		12,798		(7,640)		279,459
Segment Adjusted EBITDA (4)		94,830		53,621		3,588		15,256		(2,105)		165,190
Total assets		1,425,798		463,857		158,675		363,632		(168,548)		2,243,414
Capital expenditures		37,448		13,376		—		701		—		51,525

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of sales from the Matrix Group and MAC to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the Matrix Group revenues, Mt. Vernon transloading revenues, administrative service revenues from affiliates, MAC revenues, Wildcat Insurance revenues and brokerage coal sales.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as these expenses are passed through to our customers and consequently we do not realize any gain or loss on transportation revenues. 

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The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to Operating expenses (excluding depreciation, depletion and amortization):

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Segment Adjusted EBITDA Expense	$	302,857	$	279,459
Outside coal purchases		—		(1,374)
Other expense		(129)		(847)
Operating expenses (excluding depreciation, depletion and amortization)	$	302,728	$	277,238

(4) Segment Adjusted EBITDA is defined as net income attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses, settlement gain, debt extinguishment loss, asset impairments, and acquisition gains.  Management therefore is able to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  Consolidated Segment Adjusted EBITDA is reconciled to net income as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	206,644	$	165,190
General and administrative		(17,812)		(16,651)
Depreciation, depletion and amortization		(71,139)		(61,848)
Settlement gain		—		80,000
Interest expense, net		(11,331)		(10,793)
Acquisition gain		177,043		—
Income tax benefit		106		10
Acquisition gain attributable to noncontrolling interest		(7,083)		—
Net income attributable to ARLP	$	276,428	$	155,908
Noncontrolling interest		7,176		148
Net income	$	283,604	$	156,056

(5) Capital Expenditures shown exclude the Acquisition on January 3, 2019 (Note 3 – Acquisitions).

18.SUBSEQUENT EVENTS

Other than those events described in Notes 11 and 16, there were no subsequent events.

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ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Significant relationships referenced in this management's discussion and analysis of financial condition and results of operations include the following:

· References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

· References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

· References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner. 

· References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

· References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land-holding company for the mining operations of Alliance Resource Operating Partners, L.P.

· References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for the mining operations of Alliance Resource Operating Partners, L.P.

Summary

We operate in the United States as a diversified natural resource company that generates income from the production and marketing of coal to major domestic and international utilities and industrial users as well as income from oil & gas mineral interests.  We began coal mining operations in 1971 and, since then, have grown through acquisitions and internal development in strategic producing regions to become the second largest coal producer in the eastern United States.  As is customary in the coal industry, we have entered into long-term coal supply agreements with many of our customers.  In 2014, we began acquiring oil & gas mineral interests in premier oil & gas producing regions across the United States.

We have three reportable segments, Illinois Basin, Appalachia and Minerals.  We also have an "all other" category referred to as Other and Corporate.  The two coal reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues. The two coal mining segments include eight underground mining complexes in Illinois, Indiana, Kentucky, Maryland and West Virginia.  We also have a coal loading terminal in Indiana on the Ohio River included in Other and Corporate.  The Minerals segment includes our oil & gas mineral interests which are located primarily in the Anadarko (SCOOP/STACK), Permian (Delaware and Midland), Williston (Bakken) and Appalachian basins.   We have no operations within our Minerals reportable segment other than receiving royalties for our oil & gas mineral interests.

On January 3, 2019 (the "Acquisition Date"), we acquired all of the limited partner interests not owned by Cavalier Minerals JV, LLC ("Cavalier Minerals") in AllDale Minerals LP ("AllDale I") and AllDale Minerals II, LP ("AllDale II", and collectively with AllDale I, "AllDale I & II") and the general partner interests in AllDale I & II for $176.0 million (the "Acquisition").  As a result of the Acquisition and our previous investments held through Cavalier Minerals, we now control approximately 43,000 net royalty acres in premier oil & gas resource plays.  The Acquisition provides us with diversified exposure to industry leading operators and is consistent with our general business strategy to pursue accretive acquisitions.  Please read “Item 1. Financial Statements (Unaudited) - Note 3 – Acquisition” of this Quarterly Report on Form 10-Q for more information on the Acquisition.

As a result of the Acquisition, we now control the underlying oil & gas mineral interests held by AllDale I & II.  This control over the oil & gas mineral interests held by AllDale I & II reflects a strategic change in how we manage our business and how resources are allocated by our chief operating decision maker.   Due to this strategic change we have restructured our reportable segments in the first quarter of 2019 to include our oil & gas mineral interests within a new Minerals reportable segment.  Prior periods have been recast to include our oil & gas minerals interests in the Minerals segment.

· Illinois Basin reportable segment includes currently operating mining complexes (a) Webster County Coal, LLC's Dotiki mining complex ("Dotiki"), (b) Gibson County Coal, LLC's mining complex, which includes the Gibson North and Gibson South mines, (c) Warrior Coal, LLC's mining complex, (d) River View Coal, LLC's mining

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complex ("River View") and (e) Hamilton County Coal, LLC's mining complex ("Hamilton").  The Gibson North mine had been idled since the fourth quarter of 2015 in response to market conditions but resumed production in May 2018. 

The Illinois Basin reportable segment also includes White County Coal, LLC's Pattiki mining complex ("Pattiki"), Hopkins County Coal, LLC's mining complex, which includes the Elk Creek mine, the Pleasant View surface mineable reserves and the Fies underground project, Sebree Mining, LLC's mining complex, which includes the Onton mine, Steamport, LLC and certain reserves, CR Services, LLC, CR Machine Shop, LLC, certain properties and equipment of Alliance Resource Properties, ARP Sebree, LLC, ARP Sebree South, LLC and UC Coal, LLC and its subsidiaries, UC Mining, LLC and UC Processing, LLC (collectively "UC Coal").   

· Appalachia reportable segment includes currently operating mining complexes (a) Mettiki mining complex ("Mettiki"), (b) Tunnel Ridge, LLC mining complex ("Tunnel Ridge"), and (c) MC Mining, LLC mining complex ("MC Mining").  Mettiki includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant.  The Appalachia reportable segment also includes the Penn Ridge property.

· Minerals reportable segment includes AllDale I & II; Alliance Royalty, LLC; AllRoy GP, LLC; CavMM, LLC; and Alliance Minerals, LLC's ("Alliance Minerals") equity interests in AllDale Minerals III, LP ("AllDale III") and Cavalier Minerals.  Please read "Item 1 - Financial Statements (Unaudited) - Note 10 – Investments" and "Note 9 – Variable Interest Entities" of this Quarterly Report on Form 10-Q for more information on Alliance Minerals and Cavalier Minerals.

· Other and Corporate includes marketing and administrative activities, Alliance Service, Inc. ("ASI") and its subsidiary, Matrix Design Group, LLC and its subsidiaries Matrix Design International, LLC and Matrix Design Africa (PTY) LTD ("Matrix Design"), Alliance Design Group, LLC (collectively along with Matrix Design, the "Matrix Group"), ASI's ownership of aircraft, the Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") dock activities, Alliance Coal's coal brokerage activity, Mid-America Carbonates, LLC's manufacturing and sales (primarily to our mines) of rock dust, Alliance Minerals' equity investment in Kodiak Gas Services, LLC ("Kodiak") which was redeemed in February 2019 by Kodiak (see Note 10 – Investments) certain of Alliance Resource Properties' land and mineral interest activities, Pontiki Coal, LLC's legacy workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC, which assists the ARLP Partnership with its insurance requirements, AROP Funding, LLC ("AROP Funding")and Alliance Resource Finance Corporation ("Alliance Finance").  Please read "Item 1. Financial Statements (Unaudited) – Note 8. Long-term Debt" "and Note 10. Investments" of this Quarterly Report on Form 10-Q for more information on AROP Funding and the Kodiak redemption, respectively.

Three Months Ended March 31, 2019 Compared to Three Months Ended March 31, 2018

We reported net income attributable to ARLP of $276.4 million for the three months ended March 31, 2019 ("2019 Quarter") compared to $155.9 million for the three months ended March 31, 2018 ("2018 Quarter").  The increase of $120.5 million was primarily due to higher revenues, and gains related to the Acquisition and the redemption of our preferred equity interest in Kodiak.  Increased coal sales volumes, improved coal sales prices and the addition of royalty revenues in the 2019 Quarter drove total revenues higher to $526.6 million compared to $457.1 million in the 2018 Quarter.

	Three Months Ended March 31,
	2019		2018		2019		2018
	(in thousands)				(per ton sold)
Tons sold		10,321		9,398		N/A		N/A
Tons produced		11,323		10,482		N/A		N/A
Coal sales	$	476,016	$	423,610	$	46.12	$	45.07
Coal - Segment Adjusted EBITDA Expense (1) (2)	$	301,030	$	279,459	$	29.17	$	29.74

(1) For a  definition of Segment Adjusted EBITDA Expense and related reconciliation to comparable generally accepted accounting principles ("GAAP") financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA Expense" to GAAP "Operating Expenses."

(2) Coal - Segment Adjusted EBITDA Expense is defined as consolidated Segment Adjusted EBITDA Expense excluding our Minerals segment.

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Coal sales.  Coal sales increased $52.4 million or 12.4% to $476.0 million for the 2019 Quarter from $423.6 million for the 2018 Quarter.  The increase was attributable to a volume variance of $41.6 million resulting from increased tons sold and a price variance of $10.8 million due to higher average coal sales prices.  For the 2019 Quarter, a strong performance at our Tunnel Ridge mine, increased volumes from our River View mine due to the addition of two production units in the second half of 2018 and increased volumes resulting from the resumption of operations in the second quarter of 2018 at our Gibson North mine drove total coal sales volumes up 9.8% to 10.3 million tons and production volumes higher by 8.0% to 11.3 million tons, both as compared to the 2018 Quarter.  Average coal sales prices increased $1.05 per ton sold in the 2019 Quarter to $46.12 compared to $45.07 per ton sold in the 2018 Quarter, primarily as a result of higher export sales prices compared to the 2018 Quarter.    

Royalty revenues.  As a result of the Acquisition on January 3, 2019, we obtained control of AllDale I & II and thus began consolidation of AllDale I & II in our financial statements.  As a result of the consolidation, in the 2019 Quarter we began recording royalty revenues from AllDale I & II.  Prior to 2019, our investments in AllDale I & II were accounted for as equity method investments. AllDale I & II contributed royalty revenues of $10.7 million in the 2019 Quarter.  Please read "Item 1. Financial Statements (Unaudited) - Note 3 – Acquisition" of this Quarterly Report on Form 10-Q for more information on the Acquisition.

Coal - Segment Adjusted EBITDA Expense.  Segment Adjusted EBITDA Expense, excluding our Minerals segment, increased 7.7% to $301.0 million for the 2019 Quarter from $279.5 million for the 2018 Quarter primarily as a result of increased coal sales volumes.  On a per ton basis, Segment Adjusted EBITDA Expense, excluding our Minerals segment, decreased to $29.17 per ton sold compared to $29.74 per ton sold in the 2018 Quarter due to increased volumes from our lower cost mines. The most significant variances by category are discussed below:

· Workers' compensation expenses per ton produced decreased to $0.31 per ton in the 2019 Quarter from $0.45 per ton in the 2018 Quarter.  The decrease of $0.14 per ton produced resulted from decreased accruals at various operations; and

· Production taxes and royalty expenses incurred as a percentage of coal sales prices and volumes decreased $0.42 per produced ton sold in the 2019 Quarter compared to the 2018 Quarter primarily as a result of a favorable state production mix and a lower federal excise tax rate in 2019.    

Segment Adjusted EBITDA Expense decreases above were partially offset by the following increases:

· Labor and benefit expenses per ton produced, excluding workers' compensation, increased 2.9% to $8.93 per ton in the 2019 Quarter from $8.68 per ton in the 2018 Quarter.  The increase of $0.25 per ton was primarily due to additional labor expenses at our Gibson North and River View mines in addition to difficult mining conditions at our Dotiki mine; and

· Material and supplies expenses per ton produced increased 6.1% to $11.02 per ton in the 2019 Quarter from $10.39 per ton in the 2018 Quarter.  The increase of $0.63 per ton produced resulted primarily from increases of $0.58 per ton in longwall subsidence expense and $0.42 per ton for roof support, partially offset by decreases of $0.23 per ton for power and fuel used in the mining process and $0.15 per ton for other outside services.

Other sales and operating revenues.  Other sales and operating revenues were principally comprised of Mt. Vernon transloading revenues, Matrix Design sales and other outside services.  Other sales and operating revenues decreased to $9.6 million in the 2019 Quarter from $13.7 million in the 2018 Quarter.  The decrease of $4.1 million was primarily due to reduced mining technology product sales from Matrix Design and transloading revenues from Mt. Vernon.

Depreciation, depletion and amortization.  Depreciation, depletion and amortization expense increased to $71.1 million in the 2019 Quarter from $61.8 million in the 2018 Quarter.  The increase of $9.3 million resulted primarily from increased coal sales volumes mentioned above and depletion beginning in the 2019 Quarter, attributable to production from our AllDale I & II oil & gas mineral assets.

Settlement gain.  During the 2018 Quarter, we finalized an agreement with a customer and certain of its affiliates to settle litigation we initiated in 2015.  The agreement provided for a $93.0 million cash payment to us in the 2018 Quarter, future conditional coal supply commitments, continued export transloading capacity for our Appalachian mines and the

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acquisition of certain coal reserves near our Tunnel Ridge operation.  A settlement gain of $80.0 million was recorded in the 2018 Quarter reflecting the cash payment received net of $13.0 million of combined legal fees paid and associated incentive compensation accruals.

Equity method investment income.  Equity method investment income decreased to $0.3 million in the 2019 Quarter from $3.7 million in the 2018 Quarter as a result of the Acquisition and related consolidation of AllDale I & II in the 2019 Quarter.  Prior to 2019, our investments in AllDale I & II were accounted for as equity method investments.    

Equity securities income.  Equity securities income increased $9.2 million to $12.9 million in the 2019 Quarter compared to $3.7 million in the 2018 Quarter as a result of the redemption of our preferred interest in Kodiak for $135.0 million in the 2019 Quarter, which included an $11.5 million gain due to an early redemption premium.  We no longer hold any ownership interests in Kodiak.

Acquisition gain.  We were required to re-measure Cavalier Minerals' equity method investments in AllDale I & II to fair value as a result of the Acquisition.  The re-measurement resulted in a gain of $177.0 million in the 2019 Quarter.

Transportation revenues and expenses.  Transportation revenues and expenses were $30.2 million and $19.8 million for the 2019 and 2018 Quarters, respectively.  The increase of $10.4 million was primarily attributable to an increase in average third-party transportation rates in the 2019 Quarter, partially offset by decreased tonnage for which we arrange third-party transportation at certain mines.  The cost of third-party transportation services are passed through to our customers and we recognize transportation revenue equal to transportation expense when title to the coal passes to the customer.

Net income attributable to noncontrolling interest. Net income attributable to noncontrolling interest increased to $7.2 million in the 2019 Quarter from  $0.1 million in the 2018 Quarter as a result of allocating $7.1 million of the acquisition gain discussed above to noncontrolling interest related to Bluegrass Minerals' equity interest in Cavalier Minerals.

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Segment Adjusted EBITDA.  Our 2019 Quarter Segment Adjusted EBITDA increased $41.4 million, or 25.1%, to $206.6 million from the 2018 Quarter Segment Adjusted EBITDA of $165.2 million.  Segment Adjusted EBITDA, tons sold, coal sales, other sales and operating revenues,royalty revenues and BOE volume and Segment Adjusted EBITDA Expense by segment are as follows:

	Three Months Ended
	March 31,
	2019		2018		Increase (Decrease)
	(in thousands)
Segment Adjusted EBITDA
Coal - Illinois Basin	$	121,971	$	94,830	$	27,141	28.6	%
Coal - Appalachia		58,655		53,621		5,034	9.4	%
Minerals		9,132		3,588		5,544	(1)
Other and Corporate		19,127		15,256		3,871	25.4	%
Elimination		(2,241)		(2,105)		(136)	(6.5)	%
Total Segment Adjusted EBITDA (2)	$	206,644	$	165,190	$	41,454	25.1	%
Tons sold
Coal - Illinois Basin		7,673		7,008		665	9.5	%
Coal - Appalachia		2,648		2,390		258	10.8	%
Other and Corporate		136		181		(45)	(24.9)	%
Elimination		(136)		(181)		45	24.9	%
Total tons sold		10,321		9,398		923	9.8	%
Coal sales
Coal - Illinois Basin	$	317,270	$	276,065	$	41,205	14.9	%
Coal - Appalachia		157,453		145,289		12,164	8.4	%
Other and Corporate		5,290		7,711		(2,421)	(31.4)	%
Elimination		(3,997)		(5,455)		1,458	26.7	%
Total coal sales	$	476,016	$	423,610	$	52,406	12.4	%
Other sales and operating revenues
Coal - Illinois Basin	$	541	$	569	$	(28)	(4.9)	%
Coal - Appalachia		951		829		122	14.7	%
Other and Corporate		12,405		16,619		(4,214)	(25.4)	%
Elimination		(4,277)		(4,290)		13	0.3	%
Total other sales and operating revenues	$	9,620	$	13,727	$	(4,107)	(29.9)	%
Royalty revenues and BOE volume
Volume - BOE (3)		252		—		252	(1)
Royalty revenues excluding lease bonuses	$	10,393	$	—	$	10,393	(1)
Lease bonuses		335		—		335	(1)
Total royalty revenues	$	10,728	$	—	$	10,728	(1)
Segment Adjusted EBITDA Expense
Coal - Illinois Basin	$	195,840	$	181,803	$	14,037	7.7	%
Coal - Appalachia		99,749		92,498		7,251	7.8	%
Minerals		1,827		—		1,827	(1)
Other and Corporate		11,474		12,798		(1,324)	(10.3)	%
Elimination		(6,033)		(7,640)		1,607	21.0	%
Total Segment Adjusted EBITDA Expense	$	302,857	$	279,459	$	23,398	8.4	%

(1) Percentage change not meaningful.

(2) For a definition of Segment Adjusted EBITDA and related reconciliation to comparable GAAP financial measures, please see below under "—Reconciliation of non-GAAP "Segment Adjusted EBITDA" to GAAP "net income." 

(3) Barrels of oil equivalent ("BOE") is calculated on a 6:1 basis (6,000 cubic feet of natural gas to one barrel of oil).

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Illinois Basin – Segment Adjusted EBITDA increased 28.6% to $122.0 million in the 2019 Quarter from $94.8 million in the 2018 Quarter.  The increase of $27.2 million was primarily attributable to higher coal sales, which increased 14.9% to $317.3 million in the 2019 Quarter from $276.1 million in the 2018 Quarter, partially offset by increased operating expenses.  The increase of $41.2 million in coal sales reflects higher coal sales volumes and prices.  The resumption of operations at our Gibson North mine in the second quarter of 2018 and the addition of two production units at the River View mine in the second half of 2018 drove Illinois Basin coal sales volumes in the 2019 Quarter higher by 9.5% to 7.7 million tons compared to 7.0 million tons sold in the 2018 Quarter. Coal sales price per ton sold in the 2019 Quarter increased 5.0% due to higher export sales prices compared to the 2018 Quarter.  Segment Adjusted EBITDA Expense increased 7.7% to $195.8 million in the 2019 Quarter from $181.8 million in the 2018 Quarter due to increased sales volumes.  Segment Adjusted EBITDA Expense per ton decreased $0.42 per ton sold to $25.52 from $25.94 per ton sold in the 2018 Quarter, primarily due to increased sales of lower-cost production from our River View and Gibson North mines and improved recoveries from our Hamilton mine in the 2019 Quarter.

Appalachia – Segment Adjusted EBITDA increased 9.4% to $58.7 million for the 2019 Quarter from $53.6 million in the 2018 Quarter.  The increase of $5.1 million was primarily attributable to higher coal sales, which increased 8.4% to $157.5 million in the 2019 Quarter from $145.3 million in the 2018 Quarter, partially offset by increased operating expenses.  The increase of $12.2 million in coal sales reflects higher coal sales volumes of 2.6 million tons sold in the 2019 Quarter compared to 2.4 million tons sold in the 2018 Quarter due primarily to strong sales performance at our Tunnel Ridge longwall operation in the 2019 Quarter.  Segment Adjusted EBITDA Expense increased 7.8% to $99.7 million in the 2019 Quarter from $92.5 million in the 2018 Quarter due to increased sales volumes.  Segment Adjusted EBITDA Expense per ton decreased $1.03 per ton sold to $37.67 compared to $38.70 per ton sold in the 2018 Quarter, primarily due to increased volumes and improved recoveries from the Tunnel Ridge mine in the 2019 Quarter.

Minerals  – Segment Adjusted EBITDA increased to $9.1 million for the 2019 Quarter from $3.6 million in the 2018 Quarter.  The increase of $5.5 million primarily resulted from the Acquisition in the 2019 Quarter. 

Other and Corporate – Segment Adjusted EBITDA increased by $3.8 million to $19.1 million in the 2019 Quarter compared to $15.3 million in the 2018 Quarter.  The increase was primarily attributable to higher equity securities income in the 2019 Quarter as a result of the redemption of our preferred interest in Kodiak, which included an $11.5 million gain due to an early redemption premium, partially offset by reduced mining technology product sales from Matrix Group and transloading revenues from Mt. Vernon.

Reconciliation of non-GAAP "Segment Adjusted EBITDA" to GAAP "net income" and reconciliation of non-GAAP "Segment Adjusted EBITDA Expense" to GAAP "Operating Expenses"

Segment Adjusted EBITDA (a non-GAAP financial measure) is defined as net income attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses, settlement gain and acquisition gain.  Segment Adjusted EBITDA is a key component of consolidated EBITDA, which is used as a supplemental financial measure by management and by external users of our financial statements such as investors, commercial banks, research analysts and others.  We believe that the presentation of EBITDA provides useful information to investors regarding our performance and results of operations because EBITDA, when used in conjunction with related GAAP financial measures, (i) provides additional information about our core operating performance and ability to generate and distribute cash flow, (ii) provides investors with the financial analytical framework upon which we base financial, operational, compensation and planning decisions and (iii) presents a measurement that investors, rating agencies and debt holders have indicated is useful in assessing us and our results of operations.

Segment Adjusted EBITDA is also used as a supplemental financial measure by our management for reasons similar to those stated in the previous explanation of EBITDA.  In addition, the exclusion of corporate general and administrative expenses from consolidated Segment Adjusted EBITDA allows management to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.

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The following is a reconciliation of consolidated Segment Adjusted EBITDA to net income, the most comparable GAAP financial measure:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	206,644	$	165,190
General and administrative		(17,812)		(16,651)
Depreciation, depletion and amortization		(71,139)		(61,848)
Settlement gain		—		80,000
Interest expense, net		(11,331)		(10,793)
Acquisition gain		177,043		—
Income tax benefit		106		10
Acquisition gain attributable to noncontrolling interest		(7,083)		—
Net income attributable to ARLP	$	276,428	$	155,908
Noncontrolling interest		7,176		148
Net income	$	283,604	$	156,056

Segment Adjusted EBITDA Expense (a non-GAAP financial measure) includes operating expenses, coal purchases and other income.  Transportation expenses are excluded as these expenses are passed through to our customers and, consequently, we do not realize any gain or loss on transportation revenues.  Segment Adjusted EBITDA Expense is used as a supplemental financial measure by our management to assess the operating performance of our segments.  Segment Adjusted EBITDA Expense is a key component of Segment Adjusted EBITDA in addition to coal sales, royalty revenues and other sales and operating revenues.  The exclusion of corporate general and administrative expenses from Segment Adjusted EBITDA Expense allows management to focus solely on the evaluation of segment operating performance as it primarily relates to our operating expenses. 

The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expense, the most comparable GAAP financial measure:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Segment Adjusted EBITDA Expense	$	302,857	$	279,459
Outside coal purchases		—		(1,374)
Other expense		(129)		(847)
Operating expenses (excluding depreciation, depletion and amortization)	$	302,728	$	277,238

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Liquidity and Capital Resources

Liquidity

We have historically satisfied our working capital requirements and funded our capital expenditures, investments and debt service obligations with cash generated from operations, cash provided by the issuance of debt or equity, borrowings under credit and securitization facilities and sale-leaseback transactions.  We believe that existing cash balances, future cash flows from operations and investments, borrowings under credit facilities and cash provided from the issuance of debt or equity will be sufficient to meet our working capital requirements, capital expenditures and additional investments, debt payments, commitments and distribution payments.  Nevertheless, our ability to satisfy our working capital requirements, to fund planned capital expenditures, to service our debt obligations or to pay distributions will depend upon our future operating performance and access to and cost of financing sources, which will be affected by prevailing economic conditions generally and in the coal and oil & gas industries specifically, as well as other financial and business factors, some of which are beyond our control.  Based on our recent operating results, current cash position, current unitholder distributions, anticipated future cash flows and sources of financing that we expect to have available, we do not anticipate any constraints to our liquidity at this time.  However, to the extent operating cash flow or access to and cost of financing sources are materially different than expected, future liquidity may be adversely affected.  Please read "Item 1A. Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2018. 

In May 2018, the MGP board of directors approved the establishment of a unit repurchase program authorizing us to repurchase up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions.  The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  Please read "Part II - Item 2. Unregistered Sales of Equity Securities and Use of Proceeds" of this Quarterly Report on Form 10-Q for more information on unit repurchase program.

On January 3, 2019, we acquired all of the limited partner interests in AllDale I & II not owned by Cavalier Minerals and the general partner interests in AllDale I & II for $176.0 million, which was funded with cash on hand and borrowings under our revolving credit facility.  On February 8, 2019, Kodiak redeemed our preferred equity interest for $135.0 million in cash.For more information on these transactions, please read "Item 1. Financial Statements (Unaudited) – Note 3.  Acquisition" and "–  Note 10. Investments" of this Quarterly Report on Form 10-Q.

Mine Development Project

We have begun development activity for MC Mining's Excel Mine No. 5 and currently anticipate deploying total capital of approximately $45.0 million to $50.0 million over the next 12 to 18 months,  including $40.0 million to $45.0 million in 2019, which we expect to fund with cash from operations or borrowings under our credit facilities.  We anticipate the new mine will enable us to access an additional 15 million tons of coal reserves with an expected mine life of approximately 12 years assuming the current level of production at MC Mining's Excel Mine No. 4 continues at the new mine.    We expect the development plan for the new Excel Mine No. 5 will provide a seamless transition from the current MC Mining operation as its reserves deplete in 2020.

Cash Flows

Cash provided by operating activities was $143.7 million for the 2019 Quarter compared to $224.2 million for the 2018 Quarter.  The decrease in cash provided by operating activities was primarily due to $93 million received in the 2018 Quarter for a one-time settlement related to litigation with a customer and certain of its affiliates initiated in 2015.  The decrease also resulted from unfavorable working capital changes related to payroll and related benefit accruals, trade receivables and prepaid expenses and other assets.  The decreases were partially offset by a favorable working capital change related to accounts payable. 

Net cash used in investing activities was $116.0 million for the 2019 Quarter compared to $62.2 million for the 2018 Quarter.    The increase in cash used in investing activities was primarily attributable to the Acquisition and increased capital expenditures for mine infrastructure and equipment at various mines. This increase was partially offset by cash received from the redemption of our equity securities and favorable changes in accounts payable related to property, plant and equipment purchases in the 2019 Quarter in addition to equity method investment contributions in the 2018 Quarter. 

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Net cash used in financing activities was $241.7 million for the 2019 Period compared to $140.0 million for the 2018 Period.  The increase in cash used in financing activities was primarily attributable to increased overall net payments on the securitization and revolving credit facilities and an increase in withholding taxes on issuance of units primarily under our long-term incentive plan in the 2019 Quarter compared to the 2018 Quarter as well as payments made to repurchase units in the 2019 Quarter.

Capital Expenditures

Capital expenditures increased to $84.0 million in the 2019 Quarter from $51.5 million in the 2018 Quarter.  See our discussion of "Cash Flows" above concerning the increase in capital expenditures.

We currently project average estimated annual maintenance capital expenditures over the five-year period beginning in January 2019 of approximately $5.57 per ton produced.  Our anticipated total capital expenditures (including investments) for the year ending December 31, 2019 are estimated in a range of $360.0 million to $400.0 million, which includes expenditures for maintenance capital at various mines.  Management anticipates funding remaining 2019 capital requirements with cash and cash equivalents ($30.2 million as of March 31, 2019), cash flows from operations and investments, borrowings under revolving credit and securitization facilities and cash provided from the issuance of debt or equity.  We will continue to have significant capital requirements over the long-term, which may require us to incur debt or seek additional equity capital.  The availability and cost of additional capital will depend upon prevailing market conditions, the market price of our common units and several other factors over which we have limited control, as well as our financial condition and results of operations.

Debt Obligations

Credit Agreement.On January 27, 2017, our Intermediate Partnership entered into a Fourth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $494.75 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of May 23, 2021.

The Credit Agreement is guaranteed by all of the material direct and indirect subsidiaries of our Intermediate Partnership, and is secured by substantially all of the Intermediate Partnership's assets.  Borrowings under the Revolving Credit Facility bear interest, at the option of the Intermediate Partnership, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 4.85% as of March 31, 2019.  At March 31, 2019, we had $9.3 million of letters of credit outstanding with $460.5 million available for borrowing under the Revolving Credit Facility. We currently incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments. 

The Credit Agreement contains various restrictions affecting our Intermediate Partnership and its subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, in each case subject to various exceptions, and the payment of cash distributions by our Intermediate Partnership if such payment would result in a certain fixed charge coverage ratio (as defined in the Credit Agreement).  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0 and (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0, in each case, during the four most recently ended fiscal quarters.  The debt to cash flow ratio and cash flow to interest expense ratio were 0.81 to 1.0 and 16.6 to 1.0, respectively, for the trailing twelve months ended March 31, 2019.  We remain in compliance with the covenants of the Credit Agreement as of March 31, 2019.

Senior Notes.On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation (as co-issuer), a wholly owned subsidiary of the Intermediate Partnership ("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.  The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The

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indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem up to 35% of the aggregate principal amount of the Senior Notes with the net cash proceeds of one or more equity offerings at a redemption price equal to 107.5% of the principal amount redeemed, plus accrued and unpaid interest, if any, to the redemption date.  The issuers of the Senior Notes may also redeem all or a part of the notes at any time on or after May 1, 2020, at redemption prices set forth in the indenture governing the Senior Notes.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem the Senior Notes at a redemption price equal to the principal amount of the Senior Notes plus a "make-whole" premium, plus accrued and unpaid interest, if any, to the redemption date.

Accounts Receivable Securitization.    On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  It was renewed in January 2019 and matures in January 2020. At March 31, 2019, we had $90.0 million outstanding balance under the Securitization Facility.

Cavalier Credit Agreement.  On October 6, 2015, Cavalier Minerals (see Note 9 – Variable Interest Entities) entered into a credit agreement (the "Cavalier Credit Agreement") with Mineral Lending, LLC ("Mineral Lending") for a $100.0 million line of credit (the "Cavalier Credit Facility").  The commitment under the Cavalier Credit Facility is reduced by any distributions received from Cavalier Minerals' investment in AllDale II. As of March 31, 2019, the commitment under the Cavalier Credit Facility was $68.2 million.  Mineral Lending is an entity owned by (a) Alliance Resource Holdings II, Inc. ("ARH II"), an entity owned by Joseph W. Craft III, the Chairman, President and Executive Officer of MGP ("Mr. Craft") and Kathleen S. Craft, (b) an entity owned by an individual who is an officer and director of ARH II and (c) charitable foundations established by Mr. Craft and Kathleen S. Craft.  There is no commitment fee under the facility.  Mineral Lending's obligation to make the line of credit available terminates no later than October 6, 2019.  Borrowings under the Cavalier Credit Facility bear interest at a one month LIBOR rate plus 6% with interest payable quarterly, and mature on September 30, 2024, at which time all amounts then outstanding are required to be repaid. The Cavalier Credit Agreement requires repayment of the principal balance beginning in 2018, in quarterly payments of an amount equal to the greater of $1.3 million initially, escalated to $2.5 million after two years, or fifty percent of Cavalier Minerals' excess cash flow. To secure payment of the facility, Cavalier Minerals pledged all of its partnership interests, owned or later acquired, in AllDale I & II.  Cavalier Minerals may prepay the Cavalier Credit Facility at any time in whole or in part subject to terms and conditions described in the Cavalier Credit Agreement.  As of March 31, 2019, Cavalier Minerals had not drawn on the Cavalier Credit Facility. 

Other.  We also have an agreement with a bank to provide additional letters of credit in an amount of $5.0 million to maintain surety bonds to secure certain asset retirement obligations and our obligations for workers' compensation benefits.  At March 31, 2019, we had $5.0 million in letters of credit outstanding under this agreement.

Related-Party Transactions

We have related-party transactions with MGP, ARH II and their respective affiliates. These related-party transactions relate principally to mineral leases with charitable foundations established by Mr. Craft and Kathleen S. Craft and agreements relating to the use of aircraft.   We also have transactions with (a) WKY CoalPlay, LLC ("WKY CoalPlay") regarding three mineral leases, (b) Bluegrass Minerals Management, LLC ("Bluegrass Minerals") through its noncontrolling ownership interest in Cavalier Minerals and (c) AllDale III to support its acquisition of oil & gas mineral interests.    For more information regarding WKY CoalPlay, Bluegrass Minerals and AllDale III, please read "Item 1. Financial Statements (Unaudited) – Note 9. Variable Interest Entities," "– Note 10. Investments" and "– Note 18. Subsequent Events" of this Quarterly Report on Form 10-Q.  Please read our Annual Report on Form 10-K for the year ended December 31, 2018, "Item 8. Financial Statements and Supplementary Data – Note 18. Related-Party Transactions" for additional information concerning related-party transactions.

Prior to the Acquisition and Kodiak redemption, we also had transactions with AllDale I & II to support their  acquisition of oil & gas mineral interests, and Kodiak to support its gas compression services.  For more information

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regarding the Acquisition and Kodiak redemption, please read "Item 1. Financial Statements (Unaudited) – Note 3.  Acquisition" and "– Note 10.  Investments" of this Quarterly Report on Form 10-Q.

New Accounting Standards

See "Item 1. Financial Statements (Unaudited) – Note 2. New Accounting Standards" of this Quarterly Report on Form 10-Q for a discussion of new accounting standards.

ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Commodity Price Risk

We have significant long-term coal supply agreements.  Most of the long-term coal supply agreements are subject to price adjustment provisions, which periodically permit an increase or decrease in the contract price typically to reflect changes in specified indices or changes in production costs resulting from regulatory changes, or both.

Our results of operations are highly dependent upon the prices we receive for our coal.  The short-term coal contracts favored by some of our customers leave us more exposed to risks of declining price periods.  Also, a significant decline in oil & gas prices would have a significant impact on our royalty revenues.

We have exposure to coal, oil & gas sales prices and price risk for supplies that are used directly or indirectly in the normal course of coal and oil & gas production such as steel, electricity and other supplies. We manage our risk for these items through strategic sourcing contracts for normal quantities required by our operations.  Historically, we have not utilized any commodity price-hedges or other derivatives related to either our sales price or supply cost risks.

Credit Risk

Most of our coal is sold to United States electric utilities or into the international markets through brokered transactions.  Therefore, our credit risk is primarily with domestic electric power generators and reputable global brokerage firms.  Our policy is to independently evaluate each customer's creditworthiness prior to entering into transactions and to constantly monitor outstanding accounts receivable against established credit limits. When deemed appropriate by our credit management department, we will take steps to reduce our credit exposure to customers that do not meet our credit standards or whose credit has deteriorated. These steps may include obtaining letters of credit or cash collateral, requiring prepayment for shipments or establishing customer trust accounts held for our benefit in the event of a failure to pay.

Exchange Rate Risk

Almost all of our transactions are denominated in United States dollars, and as a result, we do not have material exposure to currency exchange-rate risks.However, because coal is sold internationally in United States dollars, general economic conditions in foreign markets and changes in foreign currency exchange rates may provide our foreign competitors with a competitive advantage. If our competitors' currencies decline against the United States dollar or against foreign purchasers' local currencies, those competitors may be able to offer lower prices for coal to these purchasers. Furthermore, if the currencies of overseas purchasers were to significantly decline in value in comparison to the United States dollar, those purchasers may seek decreased prices for the coal we sell to them. Consequently, currency fluctuations could adversely affect the competitiveness of our coal in international markets.

Interest Rate Risk

Borrowings under the Revolving Credit Facility, Securitization Facility and Cavalier Credit Agreement are at variable rates and, as a result, we have interest rate exposure.  Historically, our earnings have not been materially affected by changes in interest rates and  we have not utilized interest rate derivative instruments related to our outstanding debt.  We had $25.0 million in borrowings under the Revolving Credit Facility and $90.0 million in borrowings under the Securitization Facility at March 31, 2019. 

There were no other changes in our quantitative and qualitative disclosures about market risk as set forth in our Annual Report on Form 10-K for the year ended December 31, 2018.

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ITEM 4.CONTROLS AND PROCEDURES

We maintain controls and procedures designed to provide reasonable assurance that information required to be disclosed in the reports we file with the Securities and Exchange Commission ("SEC") is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure.  As required by Rule 13a-15(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), we have evaluated, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) of the Exchange Act) as of March 31, 2019.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that these controls and procedures are effective as of March 31, 2019.

During the quarterly period ended March 31, 2019, other than the changes that have resulted or may result from the Acquisition as discussed below, there have not been any changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) identified in connection with this evaluation that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

On January 3, 2019 (the "Acquisition Date"), we acquired all of the limited partner interests in AllDale Minerals, LP and AllDale Minerals II, LP (collectively, "AllDale I & II") not owned by Cavalier Minerals JV, LLC and the general partner interests in AllDale I & II (the "Acquisition") as described in "Item 1. Financial Statements (Unaudited) – Note 3. Acquisition" of this Quarterly Report on Form 10-Q.  As of the Acquisition Date, we now own 100% of the general partner interests and, including the limited partner interests we hold indirectly through our ownership in Cavalier Minerals, approximately 97% of the limited partner interests in AllDale I & II.  In addition, we assumed control and began accounting for AllDale I & II on a consolidated basis.  At this time, we continue to evaluate the business and internal controls and processes of AllDale I & II and are making various changes to their management and organizational structures based on our business plan.  We are in the process of implementing our internal control structure over the acquired businesses.  We expect to complete the evaluation and integration of the internal controls and processes of AllDale I & II in the first quarter of 2020.

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FORWARD-LOOKING STATEMENTS

Certain statements and information in this Quarterly Report on Form 10-Q may constitute "forward-looking statements."  These statements are based on our beliefs as well as assumptions made by, and information currently available to, us.  When used in this document, the words "anticipate," "believe," "continue," "estimate," "expect," "forecast," "may," "project," "will," and similar expressions identify forward-looking statements.  Without limiting the foregoing, all statements relating to our future outlook, anticipated capital expenditures, future cash flows and borrowings and sources of funding are forward-looking statements. These statements reflect our current views with respect to future events and are subject to numerous assumptions that we believe are reasonable, but are open to a wide range of uncertainties and business risks, and actual results may differ materially from those discussed in these statements.  Among the factors that could cause actual results to differ from those in the forward-looking statements are:

· changes in coal prices, which could affect our operating results and cash flows;

· changes in competition in domestic and international coal markets and our ability to respond to such changes;

· legislation, regulations, and court decisions and interpretations thereof, both domestic and foreign, including those relating to the environment and the release of greenhouse gases, mining, miner health and safety and health care;

· deregulation of the electric utility industry or the effects of any adverse change in the coal industry, electric utility industry, or general economic conditions;

· risks associated with the expansion of our operations and properties;

· dependence on significant customer contracts, including renewing existing contracts upon expiration;

· adjustments made in price, volume or terms to existing coal supply agreements;

· changing global economic conditions or in industries in which our customers operate;

· recent action and the possibility of future action on trade made by United States and foreign governments;

· the effect of new tariffs and other trade measures;

· liquidity constraints, including those resulting from any future unavailability of financing;

· customer bankruptcies, cancellations or breaches to existing contracts, or other failures to perform;

· customer delays, failure to take coal under contracts or defaults in making payments;

· fluctuations in coal demand, prices and availability;

· changes in oil & gas prices, which could, among other things, affect our investments in oil & gas mineral interests;

· our productivity levels and margins earned on our coal sales;

· decline in or change in the coal industry's share of electricity generation, including as a result of environmental concerns related to coal mining and combustion and the cost and perceived benefits of other sources of electricity, such as natural gas, nuclear energy and renewable fuels;

· changes in raw material costs;

· changes in the availability of skilled labor;

· our ability to maintain satisfactory relations with our employees;

· increases in labor costs including costs of health insurance and taxes resulting from the Affordable Care Act, adverse changes in work rules, or cash payments or projections associated with post-mine reclamation and workers' compensation claims;

· increases in transportation costs and risk of transportation delays or interruptions;

· operational interruptions due to geologic, permitting, labor, weather-related or other factors;

· risks associated with major mine-related accidents, mine fires, mine floods or other interruptions;

· results of litigation, including claims not yet asserted;

· foreign currency fluctuations that could adversely affect the competitiveness of our coal abroad;

· difficulty maintaining our surety bonds for mine reclamation as well as workers' compensation and black lung benefits;

· difficulty in making accurate assumptions and projections regarding post-mine reclamation as well as pension, black lung benefits and other post-retirement benefit liabilities;

· uncertainties in estimating and replacing our coal reserves;

· uncertainties in estimating and replacing our oil & gas reserves;

· uncertainties in the amount of oil & gas production due to the level of drilling and completion activity by the operators of our oil & gas properties;

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· a loss or reduction of benefits from certain tax deductions and credits;

· difficulty obtaining commercial property insurance, and risks associated with our participation in the commercial insurance property program;

· difficulty in making accurate assumptions and projections regarding future revenues and costs associated with equity investments in companies we do not control; and

· other factors, including those discussed in "Item 1A. Risk Factors" and "Item 3. Legal Proceedings" in our Annual Report on Form 10-K for the year ended December 31, 2018.

If one or more of these or other risks or uncertainties materialize, or should underlying assumptions prove incorrect, our actual results may differ materially from those described in any forward-looking statement.  When considering forward-looking statements, you should also keep in mind the risk factors described in "Item 1A. Risk Factors" below.  These risk factors could also cause our actual results to differ materially from those contained in any forward-looking statement.  We disclaim any obligation to update the above list or to announce publicly the result of any revisions to any of the forward-looking statements to reflect future events or developments.

You should consider the information above when reading or considering any forward-looking statements contained in:

· this Quarterly Report on Form 10-Q;

· other reports filed by us with the SEC;

· our press releases;

· our website http://www.arlp.com; and

· written or oral statements made by us or any of our officers or other authorized persons acting on our behalf.

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PART II 

OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

The information in Note 4. Contingencies to the Unaudited Condensed Consolidated Financial Statements included in "Part I. Item 1. Financial Statements (Unaudited)" of this Quarterly Report on Form 10-Q herein is hereby incorporated by reference. See also "Item 3. Legal Proceedings" of our Annual Report on Form 10-K for the year ended December 31, 2018.

ITEM 1A.RISK FACTORS

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the factors discussed in Part I, Item 1A "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2018 which could materially affect our business, financial condition or future results.  The risks described in our Annual Report on Form 10-K and this Quarterly Report on Form 10-Q are not our only risks.  Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial based on current knowledge and factual circumstances, if such knowledge or facts change, also may materially adversely affect our business, financial condition and/or operating results in the future.  We do not believe there have been any material changes to the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2018.

ITEM 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

On May 31, 2018, ARLP announced that the MGP board of directors approved the establishment of a unit repurchase program authorizing ARLP to repurchase up to $100 million of its outstanding limited partner common units.  The unit repurchase program is intended to enhance ARLP’s ability to achieve its goal of creating long-term value for its unitholders and provides another means, along with quarterly cash distributions, of returning cash to unitholders. The program has no time limit and ARLP may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate ARLP to repurchase any dollar amount or number of units, and repurchases may be commenced or suspended from time to time without prior notice. 

The table below represents all unit repurchases for the three months ended March 31, 2019:

Period	Total Number of Units Purchased		Average Price Paid per Unit	Total Number of Units Purchased as Part of Publicly Announced Program		Maximum Dollar Value that May Yet Be Used to Repurchase Units Under the Publicly Announced Program
						(in thousands)
January 1 through January 31, 2019	300,970	$	17.45	300,970	$	24,153

During the three months ended March 31, 2019, we repurchased and retired 300,970 units for $5.3 million.  Since inception of the program, we have repurchased and retired 3,985,010 units at an average unit price of $19.03 for an aggregate purchase price of $75.8 million.  The remaining authorized amount for unit repurchases under this program was $24.2 million. 

ITEM 3.DEFAULTS UPON SENIOR SECURITIES

None.

38

ITEM 4.MINE SAFETY DISCLOSURES

Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K (17 CFR 229.104) is included in Exhibit 95.1 to this Quarterly Report on Form 10-Q.

ITEM 5.OTHER INFORMATION

None.

39

ITEM 6.EXHIBITS

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	SEC File No. and Film No.	Exhibit	Filing Date	Filed Herewith*
3.1	Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 17990766	3.2	07/28/2017
3.2	Amendment No. 1 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	10-K	000-26823 18634634	3.9	02/23/2018
3.3	Amendment No. 2 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 18883834	3.3	06/06/2018
3.4	Amendment No. 3 to Fourth Amended and Restated Agreement of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 18883834	3.4	06/06/2018
3.5	Amended and Restated Agreement of Limited Partnership of Alliance Resource Operating Partners, L.P.	10-K	000-26823 583595	3.2	03/29/2000
3.6	Amendment No. 1 to Amended and Restated Agreement of Limited Partnership of Alliance Resource Operating Partners, L.P.	8-K	000-26823 18883834	3.5	06/06/2018
3.7	Amended and RestatedCertificate of Limited Partnership of Alliance Resource Partners, L.P.	8-K	000-26823 17990766	3.6	07/28/2017
3.8	Certificate of Limited Partnership of Alliance Resource Operating Partners, L.P.	S-1/A	333-78845 99669102	3.8	07/23/1999
3.9	Certificate of Formation of Alliance Resource Management GP, LLC	S-1/A	333-78845 99669102	3.7	07/23/1999
3.10	Third Amended and Restated Operating Agreement of Alliance Resource Management GP, LLC	8-K	000-26823 18883834	3.7	06/06/2018
3.11	Certificate of Formation of MGP II, LLC	8-K	000-26823 17990766	3.5	07/28/2017

40

		Incorporated by Reference
Exhibit Number	Exhibit Description	Form	SEC File No. and Film No.	Exhibit	Filing Date	Filed Herewith*
3.12	Amended and Restated Operating Agreement of MGP II, LLC	8-K	000-26823 17990766	3.4	07/28/2017
31.1	Certification of Joseph W. Craft III, President and Chief Executive Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated May 6, 2019, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated May 6, 2019, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Joseph W. Craft III, President and Chief Executive Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated May 6, 2019, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of Alliance Resource Partners, L.P., dated May 6, 2019, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
95.1	Federal Mine Safety and Health Act Information
101	Interactive Data File (Form 10-Q for the quarter ended March 31, 2019 filed in XBRL).

*    Or furnished, in the case of Exhibits 32.1 and 32.2.

41

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized, in Tulsa, Oklahoma, on May 6, 2019.

ALLIANCE RESOURCE PARTNERS, L.P.
By:	Alliance Resource Management GP, LLC
	its general partner
	/s/ Joseph W. Craft, III
	Joseph W. Craft, III
	President, Chief Executive Officer
	and Chairman, duly authorized to sign on behalf of the registrant.
	/s/ Robert J. Fouch
	Robert J. Fouch
	Vice President, Controller and
	Chief Accounting Officer

42

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Joseph W. Craft III certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alliance Resource Partners, L.P.;

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 we 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 conclusion 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 quarterly period ended March 31, 2019 that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

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.

 Date: May 6, 2019

/s/ Joseph W. Craft III

Joseph W. Craft III

President, Chief Executive

Officer and Chairman

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Brian L. Cantrell, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alliance Resource Partners, L.P.;

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 we 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 conclusion 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 quarterly period ended March 31, 2019 that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;

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.

 Date: May 6, 2019

Ay 9, 2017

/s/ Brian L. Cantrell

Brian L. Cantrell

Senior Vice President and

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Alliance Resource Partners, L.P. (the “Partnership”) on Form 10-Q for the three months ended March 31, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Joseph W. Craft III, President and Chief Executive Officer of Alliance Resource Management GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Partnership.

ay
	By:	/s/ Joseph W. Craft III
	Joseph W. Craft III
	President, Chief Executive Officer and Chairman
	of Alliance Resource Management GP, LLC
	(the general partner of Alliance Resource Partners, L.P.)

        Date: May 6, 2019

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document.  A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained by the Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Alliance Resource Partners, L.P. (the “Partnership”) on Form 10-Q for the three months ended March 31, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Brian L. Cantrell, Senior Vice President and Chief Financial Officer of Alliance Resource Management GP, LLC, the general partner of the Partnership, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Partnership.

By:	/s/ Brian L. Cantrell
Brian L. Cantrell
Senior Vice President and
Chief Financial Officer
of Alliance Resource Management GP, LLC
(the general partner of Alliance Resource Partners, L.P.)

        Date: May 6, 2019

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document.  A signed original of this written statement required by Section 906 has been provided to the Partnership and will be retained by the Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

EX-95.1

EXHIBIT 95.1

Federal Mine Safety and Health Act Information

Our mining operations are subject to extensive and stringent compliance standards established pursuant to the Federal Mine Safety and Health Act of 1977, as amended by the Federal Mine Improvement and New Emergency Response Act of 2006 (as amended, the "Mine Act").  MSHA monitors and rigorously enforces compliance with these standards, and our mining operations are inspected frequently.  Citations and orders are issued by MSHA under Section 104 of the Mine Act for violations of the Mine Act or any mandatory health or safety standard, rule, order or regulation promulgated under the Mine Act.  A Section 104(a) "Significant and Substantial" or "S&S" citation is generally issued in a situation where the conditions created by the violation do not cause imminent danger, but in the opinion of the MSHA inspector could significantly and substantially contribute to the cause and effect of a mine safety or health hazard.  During the three months ended March 31, 2019, our mines were subject to 1,729 MSHA inspection days with an average of only 0.10 S&S citations written per inspection day.

The Mine Act has been construed as authorizing MSHA to issue citations and orders pursuant to the legal doctrine of strict liability, or liability without regard to fault.  If, in the opinion of an MSHA inspector, a condition exists that violates the Mine Act or regulations promulgated thereunder, then a citation or order will be issued regardless of whether we had any knowledge of, or fault in, the existence of that condition.  Many of the Mine Act standards include one or more subjective elements, so that issuance of a citation often depends on the opinions or experience of the MSHA inspector involved and the frequency of citations will vary from inspector to inspector.

If we disagree with the assertions of an MSHA inspector, we may exercise our right to challenge those findings by "contesting" the citation or order pursuant to the procedures established by the Mine Act and its regulations.  During the three months ended March 31, 2019, our operating subsidiaries contested approximately 26.0% of all citations and 54.1% of S&S citations issued by MSHA inspectors.  These contest proceedings frequently result in the dismissal or modification of previously issued citations, substantial reductions in the penalty amounts originally assessed by MSHA, or both.

The Dodd-Frank Wall Street Reform and Consumer Protection Act ("Dodd-Frank Act")  requires issuers to include in periodic reports filed with the SEC certain information relating to citations or orders for violations of standards under the Mine Act.  The following tables include information required by the Dodd-Frank Act for the three months ended March 31, 2019.    The mine data retrieval system maintained by MSHA may show information that is different than what is provided herein.  Any such difference may be attributed to the need to update that information on MSHA’s system and/or other factors.

EXHIBIT 95.1

						Total Dollar Value of
	Section 104(a)	Section	Section 104(d)	Section	Section	MSHA Assessments
Subsidiary Name / MSHA	S&S	104(b)	Citations and	110(b)(2)	107(a)	Proposed
Identification Number (1)	Citations(2)	Orders (3)	Orders (4)	Violations (5)	Orders (6)	(in thousands) (7)
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	51	-	-	-	-	$	70.8
1511935	-	-	-	-	-	$	-
Warrior Coal, LLC (KY)
1505230	-	-	-	-	-	$	-
1512083	-	-	-	-	-	$	-
1513514	-	-	-	-	-	$	-
1516460	-	-	-	-	-	$	-
1517216	20	-	-	-	-	$	37.2
1517232	-	-	-	-	-	$	-
1517678	-	-	-	-	-	$	-
1517740	-	-	-	-	-	$	-
1517758	-	-	-	-	-	$	-
1514335	-	-	-	-	-	$	0.1
Hopkins County Coal, LLC (KY)
1502013	-	-	-	-	-	$	-
1517377	-	-	-	-	-	$	-
1517515	-	-	-	-	-	$	-
1518826	-	-	-	-	-	$	-
1517378	-	-	-	-	-	$	-
River View Coal, LLC (KY)
1503178	4	-	-	-	-	$	1.1
1519374	28	-	-	-	-	$	55.7
White County Coal, LLC (IL)
1102662	-	-	-	-	-	$	-
1103058	-	-	-	-	-	$	-
Hamilton County Coal, LLC (IL)
1103242	-	-	-	-	-	$	-
1103203	15	-	-	-	-	$	21.2
Gibson County Coal, LLC (IN)
1202388	20	-	-	-	-	$	71.5
1202215	18	-	1	-	-	$	18.8
1202494	-	-	-	-	-	$	-
Sebree Mining, LLC (KY)
1519264	-	-	-	-	-	$	-
1518547	-	-	-	-	-	$	-
1517044	-	-	-	-	-	$	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	-	-	-	-	$	-
1517733	-	-	-	-	-	$	-
1519515	4	-	-	-	-	$	14.8
1519838	1	-	-	-	-	$	-
Mettiki Coal, LLC (MD)
1800621	-	-	-	-	-	$	-
1800671	2	-	-	-	-	$	0.7
1800761	-	-	-	-	-	$	-
Mettiki Coal (WV), LLC
4609028	6	-	-	-	-	$	11.7
Tunnel Ridge, LLC (PA/WV)
4608864	-	-	-	-	-	$	9.5
Other
4403236	-	-	-	-	-	$	-
4403255	-	-	-	-	-	$	-
4406630	-	-	-	-	-	$	-
4406867	-	-	-	-	-	$	-
1502709	-	-	-	-	-	$	-
Mid-America Carbonates, LLC (IL)
1103176	-	-	-	-	-	$	0.5

EXHIBIT 95.1

	Total	Received Notice	Legal	Legal	Legal
	Number of	of Pattern of	Actions	Actions	Actions
	Mining	Violations Under	Pending as of	Initiated	Resolved
Subsidiary Name / MSHA	Related	Section 104(e)	Last Day of	During	During
Identification Number (1)	Fatalities	(yes/no) (8)	Period	Period	Period
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	-	No	6	4	2
1511935	-	No	-	-	-
Warrior Coal, LLC (KY)
1505230	-	No	-	-	-
1512083	-	No	-	-	-
1513514	-	No	-	-	-
1516460	-	No	-	-	-
1517216	-	No	6	6	3
1517232	-	No	-	-	-
1517678	-	No	-	-	-
1517740	-	No	-	-	-
1517758	-	No	-	-	-
1514335	-	No	-	-	-
Hopkins County Coal, LLC (KY)
1502013	-	No	-	-	-
1517377	-	No	-	-	-
1517515	-	No	-	-	-
1518826	-	No	-	-	-
1517378	-	No	-	-	-
River View Coal, LLC (KY)
1503178	-	No	-	-	2
1519374	-	No	1	1	4
White County Coal, LLC (IL)
1102662	-	No	-	-	-
1103058	-	No	-	-	-
Hamilton County Coal, LLC (IL)
1103242	-	No	-	-	-
1103203	- (9)	No	2	2	2
Gibson County Coal, LLC (IN)
1202388	-	No	5	2	4
1202215	-	No	3	2	-
1202494	-	No	-	-	-
Sebree Mining, LLC (KY)
1519264	-	No	-	-	-
1518547	-	No	-	-	-
1517044	-	No	-	-	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	No	-	-	-
1517733	-	No	-	-	-
1519515	-	No	3	3	1
1519838	-	No	-	-	-
Mettiki Coal, LLC (MD)
1800621	-	No	-	-	-
1800671	-	No	-	-	-
1800761	-	No	-	-	-
Mettiki Coal (WV), LLC
4609028	-	No	-	-	-
Tunnel Ridge, LLC (PA/WV)
4608864	-	No	-	-	-
Other
4403236	-	No	-	-	-
4403255	-	No	-	-	-
4406630	-	No	-	-	-
4406867	-	No	-	-	-
Mid-America Carbonates, LLC (IL)
1103176	-	No	1	1	-

EXHIBIT 95.1

The number of legal actions pending before the Federal Mine Safety and Health Review Commission as of March 31, 2019 that fall into each of the following categories is as follows:

				Complaints of	Applications
	Contests of	Contests of	Complaints	Discharge/	for	Appeals of
Subsidiary Name / MSHA	Citations	Proposed	for	Discrimination	Temporary	Judges
Identification Number (1)	and Orders	Penalties	Compensation	/Interference	Relief	Rulings
Illinois Basin Operations
Webster County Coal, LLC (KY)
1502132	-	6	-	-	-	-
1511935	-	-	-	-	-	-
Warrior Coal, LLC (KY)
1505230	-	-	-	-	-	-
1512083	-	-	-	-	-	-
1513514	-	-	-	-	-	-
1516460	-	-	-	-	-	-
1517216	-	6	-	-	-	-
1517232	-	-	-	-	-	-
1517678	-	-	-	-	-	-
1517740	-	-	-	-	-	-
1517758	-	-	-	-	-	-
1514335	-	-	-	-	-	-
Hopkins County Coal, LLC (KY)
1502013	-	-	-	-	-	-
1517377	-	-	-	-	-	-
1517515	-	-	-	-	-	-
1518826	-	-	-	-	-	-
1517378	-	-	-	-	-	-
River View Coal, LLC (KY)
1503178	-	-	-	-	-	-
1519374	-	1	-	-	-	-
White County Coal, LLC (IL)
1102662	-	-	-	-	-	-
1103058	-	-	-	-	-	-
Hamilton County Coal, LLC (IL)
1103242	-	-	-	-	-	-
1103203	-	2	-	-	-	-
Gibson County Coal, LLC (IN)
1202388	-	5	-	-	-	-
1202215	-	3	-	-	-	-
1202494	-	-	-	-	-	-
Sebree Mining, LLC (KY)
1519264	-	-	-	-	-	-
1518547	-	-	-	-	-	-
1517044	-	-	-	-	-	-
Appalachia Operations
MC Mining, LLC (KY)
1508079	-	-	-	-	-	-
1517733	-	-	-	-	-	-
1519515	-	3	-	-	-	-
1519838	-	-	-	-	-	-
Mettiki Coal, LLC (MD)
1800621	-	-	-	-	-	-
1800671	-	-	-	-	-	-
1800761	-	-	-	-	-	-
Mettiki Coal (WV), LLC
4609028	-	-	-	-	-	-
Tunnel Ridge, LLC (PA/WV)
4608864	-	-	-	-	-	-
Other
4403236	-	-	-	-	-	-
4403255	-	-	-	-	-	-
4406630	-	-	-	-	-	-
4406867	-	-	-	-	-	-
Mid-America Carbonates, LLC (IL)
1103176	-	1	-	-	-	-

EXHIBIT 95.1

(1) The statistics reported for each of our subsidiaries listed above are segregated into specific MSHA identification numbers. 

(2) Mine Act section 104(a) S&S citations shown above are for alleged violations of mandatory health or safety standards that could significantly and substantially contribute to a coal mine health and safety hazard.  It should be noted that, for purposes of this table, S&S citations that are included in another column, such as Section 104(d) citations, are not also included as Section 104(a) S&S citations in this column.    

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

(4) Mine Act section 104(d) citations and orders are for an alleged unwarrantable failure (i.e., aggravated conduct constituting more than ordinary negligence) to comply with mandatory health or safety standards.

(5) Mine Act section 110(b)(2) violations are for an alleged "flagrant" failure (i.e., reckless or repeated) to make reasonable efforts to eliminate a known violation of a mandatory safety or health standard that substantially and proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

(6) Mine Act section 107(a) orders are for alleged conditions or practices which 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.

(7) Amounts shown include assessments proposed by MSHA during the three months ended March 31, 2019 on all citations and orders, including those citations and orders that are not required to be included within the above chart.

(8) Mine Act section 104(e) written notices are for an alleged pattern of violations of mandatory health or safety standards that could significantly and substantially contribute to a coal mine safety or health hazard.

(9) On January 5, 2019, an employee of a subcontractor died while working at the Hamilton County Coal mine.  Information provided by the local coroner has indicated the individual's death was due to natural causes.  The death is currently being reviewed by MSHA's Chargeability Committee.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 06, 2019
Document and Entity Information
Entity Registrant Name	ALLIANCE RESOURCE PARTNERS LP
Entity Central Index Key	0001086600
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Units Outstanding		128,391,191
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Small Business	false
Entity Emerging Growth Company	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 30,192	$ 244,150
Trade receivables	194,538	174,914
Other receivables	2,108	395
Due from affiliates	16	17
Inventories, net	85,440	59,206
Advance royalties, net	1,630	1,274
Prepaid expenses and other assets	15,811	20,730
Total current assets	329,735	500,686
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	3,474,573	2,925,808
Less accumulated depreciation, depletion and amortization	(1,579,588)	(1,513,450)
Total property, plant and equipment, net	1,894,985	1,412,358
OTHER ASSETS:
Advance royalties, net	53,499	42,923
Equity method investments	28,770	161,309
Equity securities		122,094
Goodwill	136,399	136,399
Operating lease right-of-use assets	22,508
Other long-term assets	19,234	18,979
Total other assets	260,410	481,704
TOTAL ASSETS	2,485,130	2,394,748
CURRENT LIABILITIES:
Accounts payable	112,684	96,397
Due to affiliates	66	816
Accrued taxes other than income taxes	18,484	16,762
Accrued payroll and related expenses	38,896	43,113
Accrued interest	12,509	5,022
Workers' compensation and pneumoconiosis benefits	11,268	11,137
Current finance lease obligations	40,894	46,722
Current operating lease obligations	6,911
Other current liabilities	17,429	18,902
Current maturities, long-term debt, net	90,000	92,000
Total current liabilities	349,141	330,871
LONG-TERM LIABILITIES:
Long-term debt, excluding current maturities, net	414,771	564,004
Pneumoconiosis benefits	72,922	68,828
Accrued pension benefit	41,917	43,135
Workers' compensation	40,428	41,669
Asset retirement obligations	131,905	127,655
Long-term finance lease obligations	9,082	10,595
Long-term operating lease obligations	15,462
Other liabilities	21,393	20,304
Total long-term liabilities	747,880	876,190
Total liabilities	1,097,021	1,207,061
Alliance Resource Partners, L.P. ("ARLP") Partners' Capital:
Limited Partners - Common Unitholders 128,391,191 and 128,095,511 units outstanding, respectively	1,426,360	1,229,268
Accumulated other comprehensive loss	(50,455)	(46,871)
Total ARLP Partners' Capital	1,375,905	1,182,397
Noncontrolling interest	12,204	5,290
Total Partners' Capital	1,388,109	1,187,687
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ 2,485,130	$ 2,394,748

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Mar. 31, 2019	Dec. 31, 2018
CONDENSED CONSOLIDATED BALANCE SHEETS
Common units outstanding	128,391,191	128,095,511

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
SALES AND OPERATING REVENUES:
Revenues	$ 526,602	$ 457,122
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	302,728	277,238
Outside coal purchases		1,374
General and administrative	17,812	16,651
Depreciation, depletion and amortization	71,139	61,848
Settlement gain		(80,000)
Total operating expenses	421,917	296,896
INCOME FROM OPERATIONS	104,685	160,226
Interest expense (net of interest capitalized for the three months ended March 31, 2019 and 2018 of $254 and $265, respectively)	(11,422)	(10,858)
Interest income	91	65
Equity method investment income	324	3,736
Equity securities income	12,906	3,724
Acquisition gain	177,043
Other expense	(129)	(847)
INCOME BEFORE INCOME TAXES	283,498	156,046
INCOME TAX BENEFIT	(106)	(10)
NET INCOME	283,604	156,056
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(7,176)	(148)
NET INCOME ATTRIBUTABLE TO ALLIANCE RESOURCE PARTNERS, L.P. ("NET INCOME OF ARLP")	276,428	155,908
GENERAL PARTNER'S INTEREST IN NET INCOME OF ARLP		1,560
LIMITED PARTNERS' INTEREST IN NET INCOME OF ARLP	$ 276,428	$ 154,348
BASIC AND DILUTED NET INCOME OF ARLP PER LIMITED PARTNER UNIT	$ 2.12	$ 1.16
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING – BASIC AND DILUTED	128,149,791	130,819,217
Coal sales
SALES AND OPERATING REVENUES:
Revenues	$ 476,016	$ 423,610
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	302,728	277,238
Royalties
SALES AND OPERATING REVENUES:
Revenues	10,728
Transportation revenues
SALES AND OPERATING REVENUES:
Revenues	30,238	19,785
EXPENSES:
Transportation expenses	30,238	19,785
Other sales and operating revenues
SALES AND OPERATING REVENUES:
Revenues	$ 9,620	$ 13,727

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Interest expense, interest capitalized	$ 254	$ 265

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
NET INCOME		$ 283,604	$ 156,056
OTHER COMPREHENSIVE INCOME (LOSS)
OTHER COMPREHENSIVE INCOME (LOSS)		(3,584)	1,017
COMPREHENSIVE INCOME		280,020	157,073
Less: Comprehensive income attributable to noncontrolling interest		(7,176)	(148)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP		272,844	156,925
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS)
Amortization of prior service cost	[1]	47	47
Amortization of net actuarial loss (gain)	[1]	979	969
Total adjustments		1,026	1,016
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS)
Amortization of net actuarial loss (gain)	[1]	(1,145)	1
Net actuarial loss	[1]	(3,465)
Total adjustments		$ (4,610)	$ 1

[1] Amortization of prior service cost and net actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 14 and 16 for additional details).

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
CASH FLOWS FROM OPERATING ACTIVITIES	$ 143,706	$ 224,178
Property, plant and equipment:
Capital expenditures	(84,043)	(51,525)
Increase (decrease) in accounts payable and accrued liabilities	6,470	(15)
Proceeds from sale of property, plant and equipment	103	7
Contributions to equity method investments		(11,400)
Distributions received from investments in excess of cumulative earnings	2,260	736
Payment for acquisition of business, net of cash acquired	(175,060)
Cash received from redemption of equity securities	134,288
Net cash used in investing activities	(115,982)	(62,197)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under securitization facility	108,000	37,600
Payments under securitization facility	(110,000)	(70,000)
Borrowings under revolving credit facilities		70,000
Payments under revolving credit facilities	(150,000)	(100,000)
Payments on finance lease obligations	(7,341)	(6,974)
Payments for purchases of units under unit repurchase program	(5,251)
Net settlement of withholding taxes on issuance of units in deferred compensation plans	(7,817)	(2,081)
Cash contributions by General Partners		41
Distributions paid to Partners	(69,011)	(68,396)	$ (275,902)
Other	(262)	(163)
Net cash used in financing activities	(241,682)	(139,973)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(213,958)	22,008
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	244,150	6,756	6,756
CASH AND CASH EQUIVALENTS AT END OF PERIOD	30,192	28,764	$ 244,150
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest	3,240	2,995
NON-CASH INVESTING AND FINANCING ACTIVITY:
Accounts payable for purchase of property, plant and equipment	21,055	15,621
Assets acquired by finance lease		835
Right-of-use assets acquired by operating lease	25,179
Market value of common units issued under deferred compensation plans before tax withholding requirements	17,415	$ 6,142
Acquisition of business
Fair value of assets assumed	484,303
Previously held equity-method investments	(307,322)
Cash paid, net of cash acquired	(175,060)
Fair value of liabilities assumed	$ 1,921

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ORGANIZATION AND PRESENTATION

3 Months Ended

Mar. 31, 2019

ORGANIZATION AND PRESENTATION

ORGANIZATION AND PRESENTATION

1.ORGANIZATION AND PRESENTATION

Significant Relationships Referenced in Notes to Condensed Consolidated Financial Statements

· References to "we," "us," "our" or "ARLP Partnership" mean the business and operations of Alliance Resource Partners, L.P., the parent company, as well as its consolidated subsidiaries.

· References to "ARLP" mean Alliance Resource Partners, L.P., individually as the parent company, and not on a consolidated basis.

· References to "MGP" mean Alliance Resource Management GP, LLC, ARLP's general partner. 

· References to "Intermediate Partnership" mean Alliance Resource Operating Partners, L.P., the intermediate partnership of Alliance Resource Partners, L.P.

· References to "Alliance Resource Properties" mean Alliance Resource Properties, LLC, the land-holding company for the mining operations of Alliance Resource Operating Partners, L.P.

· References to "Alliance Coal" mean Alliance Coal, LLC, the holding company for the coal mining operations of Alliance Resource Operating Partners, L.P.

Organization

ARLP is a Delaware limited partnership listed on the NASDAQ Global Select Market under the ticker symbol "ARLP."  ARLP was formed in May 1999 and completed its initial public offering on August 19, 1999 when it acquired substantially all of the coal production and marketing assets of Alliance Resource Holdings, Inc., a Delaware corporation, and its subsidiaries.  We are managed by our general partner, MGP, a Delaware limited liability company which holds a non-economic general partner interest in ARLP. 

AllDale I & II Acquisition

On January 3, 2019 (the "Acquisition Date"), we acquired all of the limited partner interests not owned by Cavalier Minerals JV, LLC ("Cavalier Minerals") in AllDale Minerals LP ("AllDale I") and AllDale Minerals II, LP ("AllDale II", and collectively with AllDale I, "AllDale I & II") and the general partner interests in AllDale I & II (the "Acquisition").  As a result of the Acquisition and our previous investments held through Cavalier Minerals, we now control approximately 43,000 net royalty acres in premier oil & gas resource plays.   The Acquisition provides us with diversified exposure to industry leading operators and is consistent with our general business strategy to pursue accretive acquisitions. See Note 3 – Acquisition for more information.

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of March 31, 2019 and December 31, 2018 and the results of our operations, comprehensive income and cash flows for the three months ended March 31, 2019 and 2018.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all of the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 and particularly as it relates to the simplification transactions completed by the Partnership on May 31, 2018 ("Simplification Transactions").

For the periods presented prior to the Simplification Transactions, completed on May 31, 2018, MGP's previous interests in both Alliance Coal and the Intermediate Partnership are reported as part of the general partner's interest in the ARLP Partnership's condensed consolidated financial statements. 

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2019.  

Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

Leases

We lease buildings and equipment under operating lease agreements that provide for the payment of minimum rentals.  We also have noncancelable lease agreements with third parties for land and equipment under finance lease obligations.  Some of our arrangements within these agreements have both lease and non-lease components, which are generally accounted for separately.  We have elected a practical expedient to account for lease and non-lease components as a single lease component for leases of buildings and office equipment.  Our leases have lease terms of one year to 20 years, some of which include automatic renewals up to ten years which are likely to be exercised, and some of which include options to terminate the lease within one year.  We also hold numerous mineral reserve leases with both related parties as well as third parties, none of which are accounted for as an operating lease or as a finance lease. 

We review each agreement to determine if an arrangement within the agreement contains a lease at the inception of an arrangement.  Once an arrangement is determined to contain either an operating or finance lease with a term greater than 12 months, we recognize a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying asset for the lease term based on the present value of lease payments over the lease term. The lease term includes all noncancelable periods defined in the lease as well as periods covered by options to extend the lease that we are reasonably certain to exercise.  As an implicit borrowing rate cannot be determined under most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

Expenses related to leases determined to be operating leases will be recognized on a straight-line basis over the lease term including any reasonably assured renewal periods, while those determined to be finance leases will be recognized following a front-loaded expense profile in which interest and amortization are presented separately in the income statement.  The determination of whether a lease is accounted for as a finance lease or an operating lease requires management to make estimates primarily about the fair value of the asset and its estimated economic useful life. 

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NEW ACCOUNTING STANDARDS

3 Months Ended

Mar. 31, 2019

NEW ACCOUNTING STANDARDS

NEW ACCOUNTING STANDARDS

2.NEW ACCOUNTING STANDARDS

New Accounting Standards Issued and Adopted

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842) ("ASU 2016-02").  ASU 2016-02 requires lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet and disclose key information about lease arrangements. Leases are now classified as either finance or operating, with the resulting classification affecting the pattern of expense recognition in the income statement.  We elected to use the modified retrospective transition method which allows a cumulative effect adjustment on the balance sheet upon adoption. The adoption of the standard resulted in the recognition of approximately $25.0 million in additional net lease assets and respective lease liabilities as of January 1, 2019. 

As part of our transition there are a number of practical expedients available in the new standard.  We elected a package of practical expedients that, among other things, allows us to not reassess the lease classification of expired or existing leases. In addition to the package of practical expedients, we also elected to use a practical expedient allowing us to use hindsight in determining the lease term for existing leases.

New Accounting Standards Issued and Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13").  ASU 2016-13 changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking "expected loss" model that generally will result in earlier recognition of allowances for losses.  The new standard will require disclosure of significantly more information related to these items.  ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for the fiscal year beginning after December 15, 2018, including interim periods.  We do not have a history of credit losses on our financial instruments, accordingly we do not anticipate ASU 2016-13 will have a material impact on our condensed consolidated financial statements.    

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ACQUISITION

3 Months Ended

Mar. 31, 2019

ACQUISITION

ACQUISITION

3.ACQUISITION

On the Acquisition Date,  we acquired all of the limited partner interests not owned by Cavalier Minerals in AllDale I & II and the general partner interests in AllDale I & II for $176.0 million, which was funded with cash on hand and borrowings under the Revolving Credit Facility discussed in Note 8 – Long-Term Debt.  As a result of the Acquisition and our previous investments held through Cavalier Minerals, we now control approximately 43,000 net royalty acres strategically positioned in the core of the Anadarko (SCOOP/STACK), Permian (Delaware and Midland), Williston (Bakken) and Appalachian basins. The Acquisition provides us with diversified exposure to industry leading operators and is consistent with our general business strategy to pursue accretive acquisitions. 

Because the underlying mineral interests held by AllDale I & II include royalty interests in producing properties, we have determined that the Acquisition should be accounted for as a business combination and the underlying assets and liabilities of AllDale I & II should be recorded at their Acquisition Date fair value on our condensed consolidated balance sheet.

The total fair value of the cash paid in the Acquisition and our previous investments were as follows:

	As of January 3, 2019
	(in thousands)
Cash	$	175,960
Previously held investments		307,322
Total	$	483,282

Prior to the Acquisition Date, we accounted for our investments in AllDale I & II, held through Cavalier Minerals, as equity method investments. The combined fair value of our equity method investments on the Acquisition Date was $307.3 million.  We re-measured our equity method investments, which had an aggregate carrying value of $130.3 million immediately prior to the Acquisition using an income approach primarily comprised of a discounted cash flow model.  The re-measurement resulted in a gain of $177.0 million which is recorded in the Acquisition gain line item in our condensed consolidated statements of income. The assumptions used in the determination of the fair value measurement include estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions are not observable in active markets and therefore the re-measurement of our equity method investments represents a Level 3 fair value measurement.

The following table summarizes the fair value allocation of assets acquired and liabilities assumed as of the Acquisition Date:

	As of January 3, 2019
	(in thousands)
Cash and cash equivalents	$	900
Mineral interests		473,701
Receivables		10,602
Accounts payable		(1,921)
Net assets acquired	$	483,282

We determined the fair value of the mineral interests using an income approach. The income approach primarily includes the development of an entity-wide value using discounted expected cash flows based on estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions used are not observable in active markets, therefore the fair value measurement of the mineral interests represents a Level 3 fair value measurement.  AllDale I & II's carrying value of the receivables and accounts payable represent their fair value given their short-term nature.

Our previous equity method investments in AllDale I & II were held through Cavalier Minerals.  Bluegrass Minerals continues to hold a 4% membership interest (the "Bluegrass Interest") as well as a profits interest in Cavalier Minerals as it did before the Acquisition.  This Bluegrass Interest represents an indirect noncontrolling interest in AllDale I & II.  The Acquisition Date fair value of the Bluegrass Interest was $12.3 million.  The fair value was determined using estimated production, projected cash flows, forward oil & gas prices and a risk adjusted discount rate. Certain assumptions used are not observable in active markets, therefore the fair value measurement represents a Level 3 fair value measurement.

The amounts of revenue and earnings, exclusive of the acquisition gain, of AllDale I & II included in our condensed consolidated statements of income from the Acquisition Date through March 31, 2019 are as follows:

	(in thousands)
Revenue	$	10,728
Net income		4,081

The following represents the pro forma revenues and net income for the three months ended March 31, 2018 as if AllDale I & II had been included in our consolidated results since January 1, 2018.  These amounts have been calculated after applying our accounting policies.  Pro forma information is not necessary for the three months ended March 31, 2019 as the Acquisition occurred at the beginning of the year.  Additionally, our results have been adjusted to remove the effect of our past equity method investments in AllDale I & II.

	Three Months Ended
	March 31,
	2018
	(in thousands)
Total revenues
As reported	$	457,122
Pro forma		464,881
Net income
As reported	$	156,056
Pro forma		155,583

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CONTINGENCIES

3 Months Ended

Mar. 31, 2019

CONTINGENCIES

CONTINGENCIES

4.CONTINGENCIES

Various lawsuits, claims and regulatory proceedings incidental to our business are pending against the ARLP Partnership.  We record accruals for potential losses related to these matters when, in management's opinion, such losses are probable and reasonably estimable.  Based on known facts and circumstances, we believe the ultimate outcome of these outstanding lawsuits, claims and regulatory proceedings will not have a material adverse effect on our financial condition, results of operations or liquidity.  However, if the results of these matters were different from management's current opinion and in amounts greater than our accruals, then they could have a material adverse effect.

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INVENTORIES

3 Months Ended

Mar. 31, 2019

INVENTORIES

INVENTORIES

5.INVENTORIES

Inventories consist of the following:

	March 31,		December 31,
	2019		2018
	(in thousands)
Coal	$	47,265	$	20,929
Supplies (net of reserve for obsolescence of $5,041 and $5,453, respectively)		38,175		38,277
Total inventories, net	$	85,440	$	59,206

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LEASES

3 Months Ended

Mar. 31, 2019

LEASES

LEASES

6.LEASES

The components of lease expense were as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Finance lease cost:
Amortization of right-of-use assets	$	4,521
Interest on lease liabilities		714
Operating lease cost		3,009
Short-term lease cost		190
Variable lease cost		332
Total lease cost	$	8,766

Supplemental cash flow information related to leases was as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,966
Operating cash flows for finance leases	$	714
Financing cash flows for finance leases	$	7,341
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	25,179

Supplemental balance sheet information related to leases was as follows:

	March 31,		December 31,
	2019		2018
	(in thousands)
Finance leases:
Property and equipment finance lease assets, gross	$	141,019	$	141,019
Accumulated depreciation		(79,097)		(74,576)
Property and equipment finance lease assets, net	$	61,922	$	66,443

	March 31,
	2019
Weighted average remaining lease term
Operating leases		11.1 years
Finance leases		1 year
Weighted average discount rate
Operating leases		6.0	%
Finance leases		5.2	%

Maturities of lease liabilities as of March 31, 2019 were as follows:

	Operating leases		Finance leases
	(in thousands)
2019	$	6,120	$	40,754
2020		3,788		8,748
2021		2,236		913
2022		2,172		913
2023		1,995		140
Thereafter		14,864		560
Total lease payments		31,175		52,028
Less imputed interest		(8,802)		(2,052)
Total	$	22,373	$	49,976

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2019

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

7.FAIR VALUE MEASUREMENTS

The following table summarizes our fair value measurements within the hierarchy:

	March 31, 2019						December 31, 2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	541,274	$	—	$	—	$	669,864	$	—
Total	$	—	$	541,274	$	—	$	—	$	669,864	$	—

The carrying amounts for cash equivalents, accounts receivable, accounts payable, accrued and other liabilities, due from affiliates and due to affiliates approximate fair value due to the short maturity of those instruments.

The estimated fair value of our long-term debt, including current maturities, is based on interest rates that we believe are currently available to us in active markets for issuance of debt with similar terms and remaining maturities (See Note 8 – Long-Term Debt).  The fair value of debt, which is based upon these interest rates, is classified as a Level 2 measurement under the fair value hierarchy.

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LONG-TERM DEBT

3 Months Ended

Mar. 31, 2019

LONG-TERM DEBT

LONG-TERM DEBT

8.LONG-TERM DEBT

Long-term debt consists of the following:

					Unamortized Discount and
	Principal				Debt Issuance Costs
	March 31,		December 31,		March 31,		December 31,
	2019		2018		2019		2018
	(in thousands)
Revolving credit facility	$	25,000	$	175,000	$	(4,665)	$	(5,203)
Senior notes		400,000		400,000		(5,564)		(5,793)
Securitization facility		90,000		92,000		—		—
		515,000		667,000		(10,229)		(10,996)
Less current maturities		(90,000)		(92,000)		—		—
Total long-term debt	$	425,000	$	575,000	$	(10,229)	$	(10,996)

Credit Facility.  On January 27, 2017, our Intermediate Partnership entered into a Fourth Amended and Restated Credit Agreement (the "Credit Agreement") with various financial institutions.  The Credit Agreement provides for a $494.75 million revolving credit facility, including a sublimit of $125 million for the issuance of letters of credit and a sublimit of $15.0 million for swingline borrowings (the "Revolving Credit Facility"), with a termination date of May 23, 2021. 

The Credit Agreement is guaranteed by all of the material direct and indirect subsidiaries of our Intermediate Partnership, and is secured by substantially all of the Intermediate Partnership's assets.  Borrowings under the Revolving Credit Facility bear interest, at the option of the Intermediate Partnership, at either (i) the Base Rate at the greater of three benchmarks or (ii) a Eurodollar Rate, plus margins for (i) or (ii), as applicable, that fluctuate depending upon the ratio of Consolidated Debt to Consolidated Cash Flow (each as defined in the Credit Agreement).  The Eurodollar Rate, with applicable margin, under the Revolving Credit Facility was 4.85% as of March 31, 2019.  At March 31, 2019, we had $9.3 million of letters of credit outstanding with $460.5 million available for borrowing under the Revolving Credit Facility. We currently incur an annual commitment fee of 0.35% on the undrawn portion of the Revolving Credit Facility.  We utilize the Revolving Credit Facility, as appropriate, for working capital requirements, capital expenditures and investments, scheduled debt payments and distribution payments. 

The Credit Agreement contains various restrictions affecting our Intermediate Partnership and its subsidiaries including, among other things, restrictions on incurrence of additional indebtedness and liens, sale of assets, investments, mergers and consolidations and transactions with affiliates, in each case subject to various exceptions, and the payment of cash distributions by our Intermediate Partnership if such payment would result in a certain fixed charge coverage ratio (as defined in the Credit Agreement).  The Credit Agreement requires the Intermediate Partnership to maintain (a) a debt to cash flow ratio of not more than 2.5 to 1.0 and (b) a cash flow to interest expense ratio of not less than 3.0 to 1.0, in each case, during the four most recently ended fiscal quarters.  The debt to cash flow ratio and cash flow to interest expense ratio were 0.81 to 1.0 and 16.6 to 1.0, respectively, for the trailing twelve months ended March 31, 2019.  We remain in compliance with the covenants of the Credit Agreement as of March 31, 2019. 

Senior Notes.  On April 24, 2017, the Intermediate Partnership and Alliance Resource Finance Corporation(as co-issuer), a wholly owned subsidiary of the Intermediate Partnership("Alliance Finance"), issued an aggregate principal amount of $400.0 million of senior unsecured notes due 2025 ("Senior Notes") in a private placement to qualified institutional buyers.The Senior Notes have a term of eight years, maturing on May 1, 2025 (the "Term") and accrue interest at an annual rate of 7.5%.  Interest is payable semi-annually in arrears on each May 1 and November 1.  The indenture governing the Senior Notes contains customary terms, events of default and covenants relating to, among other things, the incurrence of debt, the payment of distributions or similar restricted payments, undertaking transactions with affiliates and limitations on asset sales.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem up to 35% of the aggregate principal amount of the Senior Notes with the net cash proceeds of one or more equity offerings at a redemption price equal to 107.5% of the principal amount redeemed, plus accrued and unpaid interest, if any, to the redemption date.  The issuers of the Senior Notes may also redeem all or a part of the notes at any time on or after May 1, 2020, at redemption prices set forth in the indenture governing the Senior Notes.  At any time prior to May 1, 2020, the issuers of the Senior Notes may redeem the Senior Notes at a redemption price equal to the principal amount of the Senior Notes plus a "make-whole" premium, plus accrued and unpaid interest, if any, to the redemption date. 

Accounts Receivable Securitization.  On December 5, 2014, certain direct and indirect wholly owned subsidiaries of our Intermediate Partnership entered into a $100.0 million accounts receivable securitization facility ("Securitization Facility").  Under the Securitization Facility, certain subsidiaries sell trade receivables on an ongoing basis to our Intermediate Partnership, which then sells the trade receivables to AROP Funding, LLC ("AROP Funding"), a wholly owned bankruptcy-remote special purpose subsidiary of our Intermediate Partnership, which in turn borrows on a revolving basis up to $100.0 million secured by the trade receivables.  After the sale, Alliance Coal, as servicer of the assets, collects the receivables on behalf of AROP Funding.  The Securitization Facility bears interest based on a Eurodollar Rate.  It was renewed in January 2019 and matures in January 2020. At March 31, 2019, we had $90.0 million outstanding balance under the Securitization Facility. 

Cavalier Credit Agreement.  On October 6, 2015, Cavalier Minerals (see Note 9 – Variable Interest Entities) entered into a credit agreement (the "Cavalier Credit Agreement") with Mineral Lending, LLC ("Mineral Lending") for a $100.0 million line of credit (the "Cavalier Credit Facility").  The commitment under the Cavalier Credit Facility is reduced by any distributions received from Cavalier Minerals' investment in AllDale II. As of March 31, 2019, the commitment under the Cavalier Credit Facility was $68.2 million.  Mineral Lending is an entity owned by (a) Alliance Resource Holdings II, Inc. ("ARH II"), an entity owned by Joseph W. Craft III, the Chairman, President and Chief Executive Officer of MGP ("Mr. Craft") and Kathleen S. Craft, (b) an entity owned by an individual who is an officer and director of ARH II ("ARH Officer") and (c) charitable foundations established by Mr. Craft and Kathleen S. Craft.  There is no commitment fee under the facility.  Mineral Lending's obligation to make the line of credit available terminates no later than October 6, 2019.  Borrowings under the Cavalier Credit Facility bear interest at a one month LIBOR rate plus 6% with interest payable quarterly, and mature on September 30, 2024, at which time all amounts then outstanding are required to be repaid. The Cavalier Credit Agreement requires repayment of the principal balance beginning in 2018, in quarterly payments of an amount equal to the greater of $1.3 million initially, escalated to $2.5 million after two years, or fifty percent of Cavalier Minerals' excess cash flow. To secure payment of the facility, Cavalier Minerals pledged all of its partnership interests, owned or later acquired, in AllDale I & II.  Cavalier Minerals may prepay the Cavalier Credit Facility at any time in whole or in part subject to terms and conditions described in the Cavalier Credit Agreement.  As of March 31, 2019, Cavalier Minerals had not drawn on the Cavalier Credit Facility.

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VARIABLE INTEREST ENTITIES

3 Months Ended

Mar. 31, 2019

VARIABLE INTEREST ENTITIES

VARIABLE INTEREST ENTITIES

9.VARIABLE INTEREST ENTITIES

Cavalier Minerals 

On November 10, 2014, our subsidiary, Alliance Minerals, and Bluegrass Minerals Management, LLC ("Bluegrass Minerals") entered into a limited liability company agreement (the "Cavalier Agreement") to create Cavalier Minerals, which was formed to indirectly acquire oil & gas mineral interests through its ownership in AllDale I & II.  Alliance Minerals' ownership interest in Cavalier Minerals is 96%.  Bluegrass Minerals owns a 4% membership interest in Cavalier Minerals and a profits interest which entitles it to receive distributions equal to 25% of all distributions (including in liquidation) after all members have recovered their investment.  Distributions with respect to Bluegrass Minerals' profits interest will be offset by all distributions received by Bluegrass Minerals from the former general partners of AllDale I & II.    Bluegrass Minerals was Cavalier Minerals' managing member prior to the Acquisition (see Note 3 – Acquisition).  In conjunction with the Acquisition, we became the managing member in Cavalier Minerals.  Total contributions to and cumulative distributions from Cavalier Minerals are as follows: 

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		57,385		2,391

We have concluded that Cavalier Minerals is a variable interest entity ("VIE") which we consolidate as the primary beneficiary because we are the managing member and a substantial equity owner in Cavalier Minerals.  Bluegrass Minerals' equity ownership of Cavalier Minerals is accounted for as noncontrolling ownership interest in our condensed consolidated balance sheets.  In addition, earnings attributable to Bluegrass Minerals are recognized as noncontrolling interest in our condensed consolidated statements of income.

AllDale I & II

As a result of the Acquisition, we now own 100% of the general partner interests and, including the limited partner interests we hold indirectly through our ownership in Cavalier Minerals, approximately 97% of the limited partner interests in AllDale I & II.  See Note 3 – Acquisition for more information on the Acquisition.  As the general partner of AllDale I & II, we are entitled to receive 20.0% of all distributions from AllDale I & II with the remaining 80.0% allocated to limited partners based upon ownership percentages.

Since AllDale I & II are structured as limited partnerships with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale I & II are VIEs.  We consolidate AllDale I & II as the primary beneficiary because we have the power to direct the activities that most significantly impact AllDale I & II's economic performance in addition to substantial equity ownership.

The following table presents the carrying amounts and classification of AllDale I & II's assets and liabilities included in our condensed consolidated balance sheets:

	March 31,
	2019
Assets (liabilities):	(in thousands)
Cash and cash equivalents	$	3,338
Trade receivables		7,474
Other receivables		1,415
Total property, plant and equipment, net		468,815
Other long-term assets		213
Accounts payable		(1,357)
Due to affiliates		(45)

AllDale III

In February 2017, Alliance Minerals committed to directly invest $30.0 million in AllDale Minerals III, LP ("AllDale III") which was created for similar investment purposes as AllDale I & II.  Alliance Minerals completed funding of this commitment in 2018.Alliance Minerals' limited partner interest in AllDale III at March 31, 2019 was 13.9%.

The AllDale III Partnership Agreement includes a 25% profits interest for the general partner, subject to a return hurdle equal to the greater of 125% of cumulative capital contributions and a 10% internal rate of return, and following an 80/20 "catch-up" provision for the general partner.  AllDale III distributed $0.5 million and $0.4 million to Alliance Minerals during the three months ended March 31, 2019 and 2018, respectively.

Since AllDale III is structured as a limited partnership with the limited partners 1) not having the ability to remove the general partner and 2) not participating significantly in the operational decisions, we concluded that AllDale III is a VIE.We are not the primary beneficiary of AllDale III as we do not have the power to direct the activities that most significantly impact AllDale III's economic performance.  We account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.

WKY CoalPlay

On November 17, 2014, SGP Land, LLC ("SGP Land"), an indirect, wholly owned subsidiary of ARH II, and two limited liability companies ("Craft Companies") owned by irrevocable trusts established by Mr. Craft, entered into a limited liability company agreement to form WKY CoalPlay, LLC ("WKY CoalPlay").  WKY CoalPlay was formed, in part, to purchase and lease coal reserves.  WKY CoalPlay is managed by the ARH Officer discussed in Note 8 – Long-Term Debt, who is also a trustee of the irrevocable trusts owning the Craft Companies.  In December 2014 and February 2015, we entered into various coal reserve leases with WKY CoalPlay.  During the three months ended March 31, 2019, we paid $10.8 million of advanced royalties to WKY CoalPlay.   

We have concluded that WKY CoalPlay is a VIE because of our ability to exercise options to acquire reserves under lease with WKY CoalPlay, which is not within the control of the equity holders and, if it occurs, could potentially limit the expected residual return to the owners of WKY CoalPlay.  We do not have any economic or governance rights related to WKY CoalPlay and our options that provide us with a variable interest in WKY CoalPlay's reserve assets do not give us any rights that constitute power to direct the primary activities that most significantly impact WKY CoalPlay's economic performance.  SGP Land has the sole ability to replace the manager of WKY CoalPlay at its discretion and therefore has power to direct the activities of WKY CoalPlay.  Consequently, we concluded that SGP Land is the primary beneficiary of WKY CoalPlay.

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INVESTMENTS

3 Months Ended

Mar. 31, 2019

INVESTMENTS

INVESTMENTS

10.INVESTMENTS

AllDale III

As discussed in Note 9 – Variable Interest Entities, we account for our ownership interest in the income or loss of AllDale III as an equity method investment.  We record equity income or loss based on AllDale III's distribution structure.  The changes in our equity method investment in AllDale III for each of the periods presented were as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	28,974	$	14,182
Contributions		—		11,400
Equity method investment income		324		42
Distributions received		(528)		(375)
Ending balance	$	28,770	$	25,249

Kodiak

On July 19, 2017, Alliance Minerals purchased $100 million of Series A-1 Preferred Interests from Kodiak Gas Services, LLC ("Kodiak"), a privately-held company providing large-scale, high-utilization gas compression assets to customers operating primarily in the Permian Basin.  This structured investment provided us with a quarterly cash or payment-in-kind return.  We accounted for our ownership interests in Kodiak as equity securities without readily determinable fair values.  On February 8, 2019, Kodiak redeemed our preferred interest for $135.0 million in cash resulting in an $11.5 million gain due to an early redemption premium. The gain is included in the Equity securities income line item.  We no longer hold any ownership interests in Kodiak. 

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PARTNERS' CAPITAL

3 Months Ended

Mar. 31, 2019

PARTNERS' CAPITAL

PARTNERS' CAPITAL

11.PARTNERS' CAPITAL

Distributions

Distributions paid or declared during 2018 and 2019 were as follows:

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2018	$	0.5100	$	68,396
May 15, 2018		0.5150		69,047
August 14, 2018		0.5200		69,239
November 14, 2018		0.5250		69,220
Total	$	2.0700	$	275,902
February 14, 2019	$	0.5300	$	69,011
May 15, 2019 (1)		0.5350		—
Total	$	1.0650	$	69,011

(1) On April 26, 2019, we declared this quarterly distribution payable on May 15, 2019 to all unitholders of record as of May 8, 2019. 

Unit Repurchase Program

In May 2018, the MGP board of directors approved the establishment of a unit repurchase program authorizing us to repurchase and retire up to $100 million of ARLP common units.  The program has no time limit and we may repurchase units from time to time in the open market or in other privately negotiated transactions. The unit repurchase program authorization does not obligate us to repurchase any dollar amount or number of units.  During the three months ended March 31, 2019, we repurchased and retired 300,970 units for $5.3 million.  Since inception of the program, we have repurchased and retired 3,985,045 units at an average unit price of $19.03 for an aggregate purchase price of $75.9 million.  Total units repurchased includes the repurchase and retirement of 35 units representing fractional units as part of the Simplification Transactions which are not part of the unit repurchase program.

Change in Partners' Capital

The following tables present the quarterly change in Partners' Capital for the three months ended March 31, 2019 and 2018:

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Loss		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2019	128,095,511	$	1,229,268	$	(46,871)	$	5,290	$	1,187,687
Comprehensive income:
Net income	—		276,428		—		7,176		283,604
Actuarially determined long-term liability adjustments	—		—		(3,584)		—		(3,584)
Total comprehensive income									280,020
Settlement of deferred compensation plans	596,650		(7,817)		—		—		(7,817)
Purchase of units under unit repurchase program	(300,970)		(5,251)		—		—		(5,251)
Common unit-based compensation	—		2,743		—		—		2,743
Distributions on deferred common unit-based compensation	—		(1,280)		—		—		(1,280)
Distributions from consolidated company to noncontrolling interest	—		—		—		(262)		(262)
Distributions to Partners	—		(67,731)		—		—		(67,731)
Balance at March 31, 2019	128,391,191	$	1,426,360	$	(50,455)	$	12,204	$	1,388,109

						Accumulated
	Number of	Limited		General		Other
	Limited Partner	Partners'		Partner's		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Capital		Income(Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2018	130,704,217	$	1,183,219	$	14,859	$	(51,940)	$	5,348	$	1,151,486
Comprehensive income:
Net income	—		154,348		1,560		—		148		156,056
Actuarially determined long-term liability adjustments	—		—		—		1,017		—		1,017
Total comprehensive income											157,073
Settlement of deferred compensation plans	199,039		(2,081)		—		—		—		(2,081)
Simplification Transactions fees	—		(1)		—		—		—		(1)
Common unit-based compensation	—		3,006		—		—		—		3,006
Distributions on deferred common unit-based compensation	—		(1,062)		—		—		—		(1,062)
General Partner contribution	—		—		41		—		—		41
Distributions from consolidated company to noncontrolling interest	—		—		—		—		(162)		(162)
Distributions to Partners	—		(66,660)		(674)		—		—		(67,334)
Balance at March 31, 2018	130,903,256	$	1,270,769	$	15,786	$	(50,923)	$	5,334	$	1,240,966

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REVENUE FROM CONTRACTS WITH CUSTOMERS

3 Months Ended

Mar. 31, 2019

REVENUE FROM CONTRACTS WITH CUSTOMERS

REVENUE FROM CONTRACTS WITH CUSTOMERS

12.REVENUE FROM CONTRACTS WITH CUSTOMERS

The following table illustrates the disaggregation of our revenues by type, including a reconciliation to our segment presentation as presented in Note 17 – Segment Information, for the three months ended March 31, 2019 and 2018.

	Illinois						Other and
	Basin		Appalachia		Minerals		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Coal sales	$	317,270	$	157,453	$	—	$	5,290	$	(3,997)	$	476,016
Royalty revenues		—		—		10,728		—		—		10,728
Transportation revenues		29,238		1,000		—		—		—		30,238
Other sales and operating revenues		541		951		—		12,405		(4,277)		9,620
Total revenues	$	347,049	$	159,404	$	10,728	$	17,695	$	(8,274)	$	526,602
Three Months Ended March 31, 2018
Coal sales	$	276,065	$	145,289	$	—	$	7,711	$	(5,455)	$	423,610
Transportation revenues		18,271		1,514		—		—		—		19,785
Other sales and operating revenues		569		829		—		16,619		(4,290)		13,727
Total revenues	$	294,905	$	147,632	$	—	$	24,330	$	(9,745)	$	457,122

The following table illustrates the amount of our transaction price for all current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied as of March 31, 2019 and disaggregated by segment and contract duration.

							2022 and
	2019		2020		2021		Thereafter		Total
	(in thousands)
Illinois Basin coal revenues	$	813,839	$	560,253	$	239,355	$	—	$	1,613,447
Appalachia coal revenues		491,491		256,782		41,545		14,687		804,505
Other and Corporate coal revenues		17,349		—		—		—		17,349
Elimination		(13,037)		—		—		—		(13,037)
Total coal revenues (1)	$	1,309,642	$	817,035	$	280,900	$	14,687	$	2,422,264

(1) Coal revenues consists of coal sales and transportation revenues. 

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NET INCOME OF ARLP PER LIMITED PARTNER UNIT

3 Months Ended

Mar. 31, 2019

NET INCOME OF ARLP PER LIMITED PARTNER UNIT

NET INCOME OF ARLP PER LIMITED PARTNER UNIT

13.NET INCOME OF ARLP PER LIMITED PARTNER UNIT

We utilize the two-class method in calculating basic and diluted earnings per unit ("EPU").  Subsequent to the Simplification Transactions, net income of ARLP is only allocated to limited partners and participating securities under deferred compensation plans.  Prior to the Simplification Transactions, net income of ARLP was allocated to MGP, limited partners and participating securities under deferred compensation plans in accordance with their respective ownership percentages of the ARLP Partnership, after giving effect to any special income or expense allocations. 

Our participating securities under deferred compensation plans include rights to nonforfeitable distributions or distribution equivalents.  Our participating securities are outstanding awards under our Long-Term Incentive Plan ("LTIP") and phantom units in notional accounts under our Supplemental Executive Retirement Plan ("SERP") and the MGP Amended and Restated Deferred Compensation Plan for Directors ("Directors' Deferred Compensation Plan"). 

As a result of the Simplification Transactions, MGP no longer holds economic interests in the Intermediate Partnership or Alliance Coal.  We no longer make distributions or allocate income and losses to MGP in our calculation of EPU.

The following is a reconciliation of net income of ARLP used for calculating basic and diluted earnings per unit and the weighted-average units used in computing EPU for the three months ended March 31, 2019 and 2018:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands, except per unit data)
Net income of ARLP	$	276,428	$	155,908
Adjustments:
General partner's equity ownership (1)		—		(1,560)
Limited partners' interest in net income of ARLP		276,428		154,348
Less:
Distributions to participating securities		(1,105)		(1,271)
Undistributed earnings attributable to participating securities		(3,522)		(1,548)
Net income of ARLP available to limited partners	$	271,801	$	151,529
Weighted-average limited partner units outstanding – basic and diluted		128,150		130,819
Basic and diluted net income of ARLP per limited partner unit (2)	$	2.12	$	1.16

(1) Amounts for the three months ended March 31, 2019 reflect the impact of the Simplification Transactions which ended net income allocations and quarterly cash distributions to MGP after May 31, 2018.  Prior to the Simplification Transactions, MGP maintained a 1.0001% general partner interest in the Intermediate Partnership and a 0.001% managing member interest in Alliance Coal and thus received quarterly distributions and income and loss allocations during this time period. 

(2) Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,365 and 1,532 for the three months ended March 31, 2019 and 2018 respectively, were considered anti-dilutive under the treasury stock method.     

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS

3 Months Ended

Mar. 31, 2019

WORKERS' COMPENSATION AND PNEUMOCONIOSIS

WORKERS' COMPENSATION AND PNEUMOCONIOSIS

14.WORKERS' COMPENSATION AND PNEUMOCONIOSIS

The changes in the workers' compensation liability, including current and long-term liability balances, for each of the periods presented were as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	49,539	$	54,439
Accruals increase		1,961		2,641
Payments		(3,473)		(2,797)
Interest accretion		401		363
Ending balance	$	48,428	$	54,646

We limit our exposure to traumatic injury claims by purchasing a high deductible insurance policy that starts paying benefits after deductibles for a claim have been met.  The deductible level may vary by claim year.  Our workers' compensation liability above is presented on a gross basis and does not include our expected receivables on our insurance policy.  Our receivables for traumatic injury claims under this policy as of March 31, 2019 are $8.1 million and are included in Other long-term assets on our condensed consolidated balance sheet.

Certain of our mine operating entities are liable under state statutes and the Federal Coal Mine Health and Safety Act of 1969, as amended, to pay pneumoconiosis, or black lung, benefits to eligible employees and former employees and their dependents.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Service cost	$	645	$	630
Interest cost (1)		760		635
Net amortization (1)		(1,145)		1
Net periodic benefit cost	$	260	$	1,266

(1) Interest cost and net amortization is included in the Other expense line item within our condensed consolidated statements of income.

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COMPENSATION PLANS

3 Months Ended

Mar. 31, 2019

COMPENSATION PLANS

COMPENSATION PLANS

15.COMPENSATION PLANS

Long-Term Incentive Plan

We maintain the LTIP for certain employees and officers of MGP and its affiliates who perform services for us.  The LTIP awards are grants of non-vested "phantom" or notional units, also referred to as "restricted units", which upon satisfaction of time and performance-based vesting requirements, entitle the LTIP participant to receive ARLP common units.  Annual grant levels and vesting provisions for designated participants are recommended by the Chairman, President and Chief Executive Officer of MGP, subject to review and approval of the compensation committee of the MGP board of directors (the "Compensation Committee").  Vesting of all grants outstanding is subject to the satisfaction of certain financial tests, which management currently believes is probable.  Grants issued to LTIP participants are expected to cliff vest on January 1st of the third year following issuance of the grants.  We account for forfeitures of non-vested LTIP grants as they occur.  We will settle the non-vested LTIP grants by delivery of ARLP common units, except for the portion of the grants that will satisfy employee tax withholding obligations of LTIP participants.  As provided under the distribution equivalent rights ("DERs") provisions of the LTIP and the terms of the LTIP awards, all non-vested grants include contingent rights to receive quarterly distributions in cash or, at the discretion of the Compensation Committee, phantom units in lieu of cash credited to a bookkeeping account with value, equal to the cash distributions we make to unitholders during the vesting period. 

A summary of non-vested LTIP grants as of and for the three months ended March 31, 2019 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2019	1,828,080	$	17.18	$	31,699
Granted	586,644		19.93
Vested (1)	(885,381)		12.38
Non-vested grants at March 31, 2019	1,529,343		21.01		31,137

(1) During the three months ended March 31, 2019, we issued 596,650 unrestricted common units to the LTIP participants.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.

LTIP expense was $2.4 million and $2.7 million for the three months ended March 31, 2019 and 2018, respectively.  The total obligation associated with the LTIP as of March 31, 2019 was $12.3 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets. As of March 31, 2019, there was $19.8 million in total unrecognized compensation expense related to the non-vested LTIP grants that are expected to vest.  That expense is expected to be recognized over a weighted-average period of 1.8 years.

After consideration of the January 1, 2019 vesting and subsequent issuance of 596,650 common units, approximately 1.9 million units remain available under the LTIP for issuance in the future, assuming all grants issued in 2019, 2018 and 2017 and currently outstanding are settled with common units without reduction for tax withholding, no future forfeitures occur and DERs continue being paid in cash versus additional phantom units.   

Supplemental Executive Retirement Plan and Directors' Deferred Compensation Plan

We utilize the SERP to provide deferred compensation benefits for certain officers and key employees. All allocations made to participants under the SERP are made in the form of "phantom" ARLP units and SERP distributions will be settled in the form of ARLP common units.  The SERP is administered by the Compensation Committee. 

Our directors participate in the Directors' Deferred Compensation Plan. Pursuant to the Directors' Deferred Compensation Plan, for amounts deferred either automatically or at the election of the director, a notional account is established and credited with notional common units of ARLP, described in the Directors' Deferred Compensation Plan as "phantom" units.  Distributions from the Directors' Deferred Compensation Plan will be settled in the form of ARLP common units.

For both the SERP and Directors' Deferred Compensation Plan, when quarterly cash distributions are made with respect to ARLP common units, an amount equal to such quarterly distribution is credited to each participant's notional account as additional phantom units.  All grants of phantom units under the SERP and Directors' Deferred Compensation Plan vest immediately.

A summary of SERP and Directors' Deferred Compensation Plan activity as of and for the three months ended March 31, 2019 is as follows:

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2019	635,837	$	27.34	$	11,025
Granted	16,817		18.94
Issued	(115,484)		25.20
Phantom units outstanding as of March 31, 2019	537,170		27.54		10,937

Total SERP and Directors' Deferred Compensation Plan expense was $0.4 million for each of the three months ended March 31, 2019 and 2018.  As of March 31, 2019, the total obligation associated with the SERP and Directors' Deferred Compensation Plan was $14.8 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.  During the three months ended March 31, 2019, we provided 115,484 ARLP common units to a director under the Directors' Deferred Compensation Plan.

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

3 Months Ended

Mar. 31, 2019

EMPLOYEE BENEFIT PLANS

COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

16.COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS

Eligible employees at certain of our mining operations participate in a defined benefit plan (the "Pension Plan") that we sponsor.  The Pension Plan is currently closed to new applicants and participants in the Pension Plan are no longer receiving benefit accruals for service.  The benefit formula for the Pension Plan is a fixed dollar unit based on years of service.  Components of the net periodic benefit cost for each of the periods presented are as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Interest cost	$	1,216	$	1,116
Expected return on plan assets		(1,232)		(1,436)
Amortization of prior service cost		47		47
Amortization of net loss		979		969
Net periodic benefit cost (1)	$	1,010	$	696

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

During the three months ended March 31, 2019, we made contribution payments of $1.2 million to the Pension Plan for the 2018 plan year.  In April 2019, we made a contribution payment of $1.1 million for the 2019 plan year.

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SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2019

SEGMENT INFORMATION

SEGMENT INFORMATION

17.SEGMENT INFORMATION

We operate in the United States as a diversified natural resource company that generates income from the production and marketing of coal to major domestic and international utilities and industrial users as well as income from oil & gas mineral interests.  We aggregate multiple operating segments into three reportable segments, Illinois Basin, Appalachia, and Minerals.  We also have an "all other" category referred to as Other and Corporate.  Our two coal reportable segments correspond to major coal producing regions in the eastern United States with similar economic characteristics including coal quality, geology, coal marketing opportunities, mining and transportation methods and regulatory issues.  The two coal segments include eight mining complexes operating in Illinois, Indiana, Kentucky, Maryland and West Virginia.  We also have a coal loading terminal in Indiana on the Ohio River included in Other and Corporate.  The Minerals reportable segment aggregates our oil & gas mineral interests which are located primarily in the Anadarko (SCOOP/STACK), Permian (Delaware and Midland), Williston (Bakken) and Appalachian basins.  We have no operations within our Minerals reportable segment other than receiving royalties for our oil & gas mineral interests. 

As a result of the Acquisition discussed in Note 3 – Acquisitions, we now control the underlying oil & gas mineral interests held by AllDale I & II.  This control over the oil & gas mineral interests held by AllDale I & II reflects a strategic change in how we manage our business and how resources are allocated by our chief operating decision maker.   Due to this strategic change, we have restructured our reportable segments in the first quarter of 2019 to include our oil & gas mineral interests within a new Minerals reportable segment.  Prior periods have been recast to include our oil & gas minerals interests in the Minerals segment.

The Illinois Basin reportable segment includes currently operating mining complexes (a) Webster County Coal, LLC's Dotiki mining complex, (b) Gibson County Coal, LLC's mining complex, which includes the Gibson North and Gibson South mines, (c) Warrior Coal, LLC's mining complex, (d) River View Coal, LLC's mining complex and (e) Hamilton County Coal, LLC's mining complex.  The Gibson North mine had been idled since the fourth quarter of 2015 in response to market conditions but resumed production in May 2018.

The Illinois Basin reportable segment also includes White County Coal, LLC's Pattiki mining complex, Hopkins County Coal, LLC's mining complex, which includes the Elk Creek mine, the Pleasant View surface mineable reserves and the Fies underground project, Sebree Mining, LLC's mining complex, which includes the Onton mine, Steamport, LLC and certain reserves, CR Services, LLC, CR Machine Shop, LLC, certain properties and equipment of Alliance Resource Properties, ARP Sebree, LLC, ARP Sebree South, LLC and UC Coal, LLC and its subsidiaries, UC Mining, LLC and UC Processing, LLC.   

The Appalachia reportable segment includes currently operating mining complexes (a) Mettiki mining complex, (b) Tunnel Ridge, LLC mining complex and (c) MC Mining, LLC mining complex. The Mettiki mining complex includes Mettiki Coal (WV), LLC's Mountain View mine and Mettiki Coal, LLC's preparation plant.  The Appalachia reportable segment also includes the Penn Ridge property.

The Minerals reportable segment includes AllDale I & II, Alliance Royalty, LLC, AllRoy GP, LLC, CavMM, LLC, and Alliance Minerals' equity interests in both AllDale III (Note 10 – Investments) and Cavalier Minerals.

Other and Corporate includes marketing and administrative activities, ASI and its subsidiary, Matrix Design Group, LLC and its subsidiaries Matrix Design International, LLC and Matrix Design Africa (PTY) LTD ("Matrix Design"), Alliance Design Group, LLC ("Alliance Design") (collectively, the Matrix Design entities and Alliance Design are referred to as the "Matrix Group"), ASI's ownership of aircraft, the Mt. Vernon Transfer Terminal, LLC ("Mt. Vernon") dock activities, Alliance Coal's coal brokerage activity, Mid-America Carbonates, LLC ("MAC"), Alliance Minerals' equity investment in Kodiak which was redeemed in February 2019 by Kodiak (see Note 10 – Investments), certain of Alliance Resource Properties' land and mineral interest activities, Pontiki Coal, LLC's prior workers' compensation and pneumoconiosis liabilities, Wildcat Insurance, LLC ("Wildcat Insurance"), which assists the ARLP Partnership with its insurance requirements, and AROP Funding and Alliance Finance (both discussed in Note 8 – Long-Term Debt). 

Reportable segment results as of and for the three months ended March 31, 2019 and 2018 are presented below.

	Illinois						Other and		Elimination
	Basin		Appalachia		Minerals		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Revenues - Outside	$	343,052		159,404		10,728		13,418		—	$	526,602
Revenues - Intercompany		3,997		—		—		4,277		(8,274)		—
Total revenues (2)		347,049		159,404		10,728		17,695		(8,274)		526,602
Segment Adjusted EBITDA Expense (3)		195,840		99,749		1,827		11,474		(6,033)		302,857
Segment Adjusted EBITDA (4)		121,971		58,655		9,132		19,127		(2,241)		206,644
Total assets		1,422,086		468,904		510,076		462,696		(378,632)		2,485,130
Capital expenditures (5)		47,928		33,346		—		2,769		—		84,043
Three Months Ended March 31, 2018
Revenues - Outside	$	289,518	$	147,565	$	—	$	20,039	$	—	$	457,122
Revenues - Intercompany		5,387		67		—		4,291		(9,745)		—
Total revenues (2)		294,905		147,632		—		24,330		(9,745)		457,122
Segment Adjusted EBITDA Expense (3)		181,803		92,498		—		12,798		(7,640)		279,459
Segment Adjusted EBITDA (4)		94,830		53,621		3,588		15,256		(2,105)		165,190
Total assets		1,425,798		463,857		158,675		363,632		(168,548)		2,243,414
Capital expenditures		37,448		13,376		—		701		—		51,525

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of sales from the Matrix Group and MAC to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the Matrix Group revenues, Mt. Vernon transloading revenues, administrative service revenues from affiliates, MAC revenues, Wildcat Insurance revenues and brokerage coal sales.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as these expenses are passed through to our customers and consequently we do not realize any gain or loss on transportation revenues. 

The following is a reconciliation of consolidated Segment Adjusted EBITDA Expense to Operating expenses (excluding depreciation, depletion and amortization):

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Segment Adjusted EBITDA Expense	$	302,857	$	279,459
Outside coal purchases		—		(1,374)
Other expense		(129)		(847)
Operating expenses (excluding depreciation, depletion and amortization)	$	302,728	$	277,238

(4) Segment Adjusted EBITDA is defined as net income attributable to ARLP before net interest expense, income taxes, depreciation, depletion and amortization, general and administrative expenses, settlement gain, debt extinguishment loss, asset impairments, and acquisition gains.  Management therefore is able to focus solely on the evaluation of segment operating profitability as it relates to our revenues and operating expenses, which are primarily controlled by our segments.  Consolidated Segment Adjusted EBITDA is reconciled to net income as follows:

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	206,644	$	165,190
General and administrative		(17,812)		(16,651)
Depreciation, depletion and amortization		(71,139)		(61,848)
Settlement gain		—		80,000
Interest expense, net		(11,331)		(10,793)
Acquisition gain		177,043		—
Income tax benefit		106		10
Acquisition gain attributable to noncontrolling interest		(7,083)		—
Net income attributable to ARLP	$	276,428	$	155,908
Noncontrolling interest		7,176		148
Net income	$	283,604	$	156,056

(5) Capital Expenditures shown exclude the Acquisition on January 3, 2019 (Note 3 – Acquisitions).

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SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2019

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

18.SUBSEQUENT EVENTS

Other than those events described in Notes 11 and 16, there were no subsequent events.

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ORGANIZATION AND PRESENTATION (Policies)

3 Months Ended

Mar. 31, 2019

ORGANIZATION AND PRESENTATION

Basis of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements include the accounts and operations of the ARLP Partnership and present our financial position as of March 31, 2019 and December 31, 2018 and the results of our operations, comprehensive income and cash flows for the three months ended March 31, 2019 and 2018.  All intercompany transactions and accounts have been eliminated.

These condensed consolidated financial statements and notes are prepared pursuant to the rules and regulations of the Securities and Exchange Commission for interim reporting and do not include all of the information normally included with financial statements prepared in accordance with generally accepted accounting principles ("GAAP") of the United States.  These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018 and particularly as it relates to the simplification transactions completed by the Partnership on May 31, 2018 ("Simplification Transactions").

For the periods presented prior to the Simplification Transactions, completed on May 31, 2018, MGP's previous interests in both Alliance Coal and the Intermediate Partnership are reported as part of the general partner's interest in the ARLP Partnership's condensed consolidated financial statements. 

These condensed consolidated financial statements and notes are unaudited. However, in the opinion of management, these condensed consolidated financial statements reflect all normal recurring adjustments necessary for a fair presentation of the results for the periods presented.  Results for interim periods are not necessarily indicative of results to be expected for the full year ending December 31, 2019.  

Use of Estimates

Use of Estimates

The preparation of the ARLP Partnership's condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in our condensed consolidated financial statements.  Actual results could differ from those estimates.

Leases

Leases

We lease buildings and equipment under operating lease agreements that provide for the payment of minimum rentals.  We also have noncancelable lease agreements with third parties for land and equipment under finance lease obligations.  Some of our arrangements within these agreements have both lease and non-lease components, which are generally accounted for separately.  We have elected a practical expedient to account for lease and non-lease components as a single lease component for leases of buildings and office equipment.  Our leases have lease terms of one year to 20 years, some of which include automatic renewals up to ten years which are likely to be exercised, and some of which include options to terminate the lease within one year.  We also hold numerous mineral reserve leases with both related parties as well as third parties, none of which are accounted for as an operating lease or as a finance lease. 

We review each agreement to determine if an arrangement within the agreement contains a lease at the inception of an arrangement.  Once an arrangement is determined to contain either an operating or finance lease with a term greater than 12 months, we recognize a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying asset for the lease term based on the present value of lease payments over the lease term. The lease term includes all noncancelable periods defined in the lease as well as periods covered by options to extend the lease that we are reasonably certain to exercise.  As an implicit borrowing rate cannot be determined under most of our leases, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments.

Expenses related to leases determined to be operating leases will be recognized on a straight-line basis over the lease term including any reasonably assured renewal periods, while those determined to be finance leases will be recognized following a front-loaded expense profile in which interest and amortization are presented separately in the income statement.  The determination of whether a lease is accounted for as a finance lease or an operating lease requires management to make estimates primarily about the fair value of the asset and its estimated economic useful life.

New Accounting Standards

New Accounting Standards Issued and Adopted

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842) ("ASU 2016-02").  ASU 2016-02 requires lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet and disclose key information about lease arrangements. Leases are now classified as either finance or operating, with the resulting classification affecting the pattern of expense recognition in the income statement.  We elected to use the modified retrospective transition method which allows a cumulative effect adjustment on the balance sheet upon adoption. The adoption of the standard resulted in the recognition of approximately $25.0 million in additional net lease assets and respective lease liabilities as of January 1, 2019. 

As part of our transition there are a number of practical expedients available in the new standard.  We elected a package of practical expedients that, among other things, allows us to not reassess the lease classification of expired or existing leases. In addition to the package of practical expedients, we also elected to use a practical expedient allowing us to use hindsight in determining the lease term for existing leases.

New Accounting Standards Issued and Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments–Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13").  ASU 2016-13 changes the impairment model for most financial assets and certain other instruments to require the use of a new forward-looking "expected loss" model that generally will result in earlier recognition of allowances for losses.  The new standard will require disclosure of significantly more information related to these items.  ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for the fiscal year beginning after December 15, 2018, including interim periods.  We do not have a history of credit losses on our financial instruments, accordingly we do not anticipate ASU 2016-13 will have a material impact on our condensed consolidated financial statements.    

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ACQUISITION (Tables)

3 Months Ended

Mar. 31, 2019

ACQUISITIONS

Schedule of total fair value of consideration transferred

	As of January 3, 2019
	(in thousands)
Cash	$	175,960
Previously held investments		307,322
Total	$	483,282

Summary of fair value allocation of assets acquired and liabilities assumed

	As of January 3, 2019
	(in thousands)
Cash and cash equivalents	$	900
Mineral interests		473,701
Receivables		10,602
Accounts payable		(1,921)
Net assets acquired	$	483,282

Schedule of revenue and earnings since acquisition date and pro forma condensed consolidated income statement

The amounts of revenue and earnings, exclusive of the acquisition gain, of AllDale I & II included in our condensed consolidated statements of income from the Acquisition Date through March 31, 2019 are as follows:

	(in thousands)
Revenue	$	10,728
Net income		4,081

The following represents the pro forma revenues and net income for the three months ended March 31, 2018 as if AllDale I & II had been included in our consolidated results since January 1, 2018.  These amounts have been calculated after applying our accounting policies.  Pro forma information is not necessary for the three months ended March 31, 2019 as the Acquisition occurred at the beginning of the year.  Additionally, our results have been adjusted to remove the effect of our past equity method investments in AllDale I & II.

	Three Months Ended
	March 31,
	2018
	(in thousands)
Total revenues
As reported	$	457,122
Pro forma		464,881
Net income
As reported	$	156,056
Pro forma		155,583

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INVENTORIES (Tables)

3 Months Ended

Mar. 31, 2019

INVENTORIES

Schedule of inventories

	March 31,		December 31,
	2019		2018
	(in thousands)
Coal	$	47,265	$	20,929
Supplies (net of reserve for obsolescence of $5,041 and $5,453, respectively)		38,175		38,277
Total inventories, net	$	85,440	$	59,206

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LEASES (Tables)

3 Months Ended

Mar. 31, 2019

LEASES

Schedule of lease cost and other information

The components of lease expense were as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Finance lease cost:
Amortization of right-of-use assets	$	4,521
Interest on lease liabilities		714
Operating lease cost		3,009
Short-term lease cost		190
Variable lease cost		332
Total lease cost	$	8,766

Supplemental cash flow information related to leases was as follows:

	Three Months Ended
	March 31,
	2019
	(in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	2,966
Operating cash flows for finance leases	$	714
Financing cash flows for finance leases	$	7,341
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	25,179

Supplemental balance sheet information related to leases was as follows:

	March 31,		December 31,
	2019		2018
	(in thousands)
Finance leases:
Property and equipment finance lease assets, gross	$	141,019	$	141,019
Accumulated depreciation		(79,097)		(74,576)
Property and equipment finance lease assets, net	$	61,922	$	66,443

	March 31,
	2019
Weighted average remaining lease term
Operating leases		11.1 years
Finance leases		1 year
Weighted average discount rate
Operating leases		6.0	%
Finance leases		5.2	%

Schedule of maturities of operating lease liabilities

Maturities of lease liabilities as of March 31, 2019 were as follows:

	Operating leases		Finance leases
	(in thousands)
2019	$	6,120	$	40,754
2020		3,788		8,748
2021		2,236		913
2022		2,172		913
2023		1,995		140
Thereafter		14,864		560
Total lease payments		31,175		52,028
Less imputed interest		(8,802)		(2,052)
Total	$	22,373	$	49,976

Schedule of maturities of finance lease liabilities

	Operating leases		Finance leases
	(in thousands)
2019	$	6,120	$	40,754
2020		3,788		8,748
2021		2,236		913
2022		2,172		913
2023		1,995		140
Thereafter		14,864		560
Total lease payments		31,175		52,028
Less imputed interest		(8,802)		(2,052)
Total	$	22,373	$	49,976

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2019

FAIR VALUE MEASUREMENTS

Summary of fair value measurements within the hierarchy

	March 31, 2019						December 31, 2018
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Long-term debt	$	—	$	541,274	$	—	$	—	$	669,864	$	—
Total	$	—	$	541,274	$	—	$	—	$	669,864	$	—

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LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2019

LONG-TERM DEBT

Schedule of long-term debt

					Unamortized Discount and
	Principal				Debt Issuance Costs
	March 31,		December 31,		March 31,		December 31,
	2019		2018		2019		2018
	(in thousands)
Revolving credit facility	$	25,000	$	175,000	$	(4,665)	$	(5,203)
Senior notes		400,000		400,000		(5,564)		(5,793)
Securitization facility		90,000		92,000		—		—
		515,000		667,000		(10,229)		(10,996)
Less current maturities		(90,000)		(92,000)		—		—
Total long-term debt	$	425,000	$	575,000	$	(10,229)	$	(10,996)

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VARIABLE INTEREST ENTITIES (Tables)

3 Months Ended

Mar. 31, 2019

VARIABLE INTEREST ENTITIES

Schedule of distributions

	Alliance		Bluegrass
	Minerals		Minerals
	(in thousands)
Contributions	$	143,112	$	5,963
Distributions		57,385		2,391

Schedule of assets and liabilities

	March 31,
	2019
Assets (liabilities):	(in thousands)
Cash and cash equivalents	$	3,338
Trade receivables		7,474
Other receivables		1,415
Total property, plant and equipment, net		468,815
Other long-term assets		213
Accounts payable		(1,357)
Due to affiliates		(45)

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INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2019

INVESTMENTS

Schedule of changes in equity method investment

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	28,974	$	14,182
Contributions		—		11,400
Equity method investment income		324		42
Distributions received		(528)		(375)
Ending balance	$	28,770	$	25,249

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PARTNERS' CAPITAL (Tables)

3 Months Ended

Mar. 31, 2019

PARTNERS' CAPITAL

Summary of quarterly per unit distribution paid

Payment Date	Per Unit Cash Distribution		Total Cash Distribution
			(in thousands)
February 14, 2018	$	0.5100	$	68,396
May 15, 2018		0.5150		69,047
August 14, 2018		0.5200		69,239
November 14, 2018		0.5250		69,220
Total	$	2.0700	$	275,902
February 14, 2019	$	0.5300	$	69,011
May 15, 2019 (1)		0.5350		—
Total	$	1.0650	$	69,011

(1) On April 26, 2019, we declared this quarterly distribution payable on May 15, 2019 to all unitholders of record as of May 8, 2019. 

Summary of changes to Partners' Capital

				Accumulated
	Number of	Limited		Other
	Limited Partner	Partners'		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Loss		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2019	128,095,511	$	1,229,268	$	(46,871)	$	5,290	$	1,187,687
Comprehensive income:
Net income	—		276,428		—		7,176		283,604
Actuarially determined long-term liability adjustments	—		—		(3,584)		—		(3,584)
Total comprehensive income									280,020
Settlement of deferred compensation plans	596,650		(7,817)		—		—		(7,817)
Purchase of units under unit repurchase program	(300,970)		(5,251)		—		—		(5,251)
Common unit-based compensation	—		2,743		—		—		2,743
Distributions on deferred common unit-based compensation	—		(1,280)		—		—		(1,280)
Distributions from consolidated company to noncontrolling interest	—		—		—		(262)		(262)
Distributions to Partners	—		(67,731)		—		—		(67,731)
Balance at March 31, 2019	128,391,191	$	1,426,360	$	(50,455)	$	12,204	$	1,388,109

						Accumulated
	Number of	Limited		General		Other
	Limited Partner	Partners'		Partner's		Comprehensive		Noncontrolling		Total Partners’
	Units	Capital		Capital		Income(Loss)		Interest		Capital
	(in thousands, except unit data)
Balance at January 1, 2018	130,704,217	$	1,183,219	$	14,859	$	(51,940)	$	5,348	$	1,151,486
Comprehensive income:
Net income	—		154,348		1,560		—		148		156,056
Actuarially determined long-term liability adjustments	—		—		—		1,017		—		1,017
Total comprehensive income											157,073
Settlement of deferred compensation plans	199,039		(2,081)		—		—		—		(2,081)
Simplification Transactions fees	—		(1)		—		—		—		(1)
Common unit-based compensation	—		3,006		—		—		—		3,006
Distributions on deferred common unit-based compensation	—		(1,062)		—		—		—		(1,062)
General Partner contribution	—		—		41		—		—		41
Distributions from consolidated company to noncontrolling interest	—		—		—		—		(162)		(162)
Distributions to Partners	—		(66,660)		(674)		—		—		(67,334)
Balance at March 31, 2018	130,903,256	$	1,270,769	$	15,786	$	(50,923)	$	5,334	$	1,240,966

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

3 Months Ended

Mar. 31, 2019

REVENUE FROM CONTRACTS WITH CUSTOMERS

Schedule of disaggregation of revenues by type

	Illinois						Other and
	Basin		Appalachia		Minerals		Corporate		Elimination		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Coal sales	$	317,270	$	157,453	$	—	$	5,290	$	(3,997)	$	476,016
Royalty revenues		—		—		10,728		—		—		10,728
Transportation revenues		29,238		1,000		—		—		—		30,238
Other sales and operating revenues		541		951		—		12,405		(4,277)		9,620
Total revenues	$	347,049	$	159,404	$	10,728	$	17,695	$	(8,274)	$	526,602
Three Months Ended March 31, 2018
Coal sales	$	276,065	$	145,289	$	—	$	7,711	$	(5,455)	$	423,610
Transportation revenues		18,271		1,514		—		—		—		19,785
Other sales and operating revenues		569		829		—		16,619		(4,290)		13,727
Total revenues	$	294,905	$	147,632	$	—	$	24,330	$	(9,745)	$	457,122

Schedule of current coal supply contracts allocated to performance obligations that are unsatisfied or partially unsatisfied

							2022 and
	2019		2020		2021		Thereafter		Total
	(in thousands)
Illinois Basin coal revenues	$	813,839	$	560,253	$	239,355	$	—	$	1,613,447
Appalachia coal revenues		491,491		256,782		41,545		14,687		804,505
Other and Corporate coal revenues		17,349		—		—		—		17,349
Elimination		(13,037)		—		—		—		(13,037)
Total coal revenues (1)	$	1,309,642	$	817,035	$	280,900	$	14,687	$	2,422,264

(1) Coal revenues consists of coal sales and transportation revenues.

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NET INCOME OF ARLP PER LIMITED PARTNER UNIT (Tables)

3 Months Ended

Mar. 31, 2019

NET INCOME OF ARLP PER LIMITED PARTNER UNIT

Reconciliation of net income and EPU calculations

	Three Months Ended
	March 31,
	2019		2018
	(in thousands, except per unit data)
Net income of ARLP	$	276,428	$	155,908
Adjustments:
General partner's equity ownership (1)		—		(1,560)
Limited partners' interest in net income of ARLP		276,428		154,348
Less:
Distributions to participating securities		(1,105)		(1,271)
Undistributed earnings attributable to participating securities		(3,522)		(1,548)
Net income of ARLP available to limited partners	$	271,801	$	151,529
Weighted-average limited partner units outstanding – basic and diluted		128,150		130,819
Basic and diluted net income of ARLP per limited partner unit (2)	$	2.12	$	1.16

(1) Amounts for the three months ended March 31, 2019 reflect the impact of the Simplification Transactions which ended net income allocations and quarterly cash distributions to MGP after May 31, 2018.  Prior to the Simplification Transactions, MGP maintained a 1.0001% general partner interest in the Intermediate Partnership and a 0.001% managing member interest in Alliance Coal and thus received quarterly distributions and income and loss allocations during this time period. 

Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive.  The combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,365 and 1,532 for the three months ended March 31, 2019 and 2018 respectively, were considered anti-dilutive under the treasury stock method

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS (Tables)

3 Months Ended

Mar. 31, 2019

Accrued Workers Compensation And Pneumoconiosis Benefits

Reconciliation of changes in workers' compensation liability

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Beginning balance	$	49,539	$	54,439
Accruals increase		1,961		2,641
Payments		(3,473)		(2,797)
Interest accretion		401		363
Ending balance	$	48,428	$	54,646

Pneumoconiosis benefits

Accrued Workers Compensation And Pneumoconiosis Benefits

Components of net periodic benefit cost

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Service cost	$	645	$	630
Interest cost (1)		760		635
Net amortization (1)		(1,145)		1
Net periodic benefit cost	$	260	$	1,266

Interest cost and net amortization is included in the Other expense line item within our condensed consolidated statements of income

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COMPENSATION PLANS (Tables)

3 Months Ended

Mar. 31, 2019

ARLP LTIP

Compensation Plans

Summary of activity in share-based plans

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Non-vested grants at January 1, 2019	1,828,080	$	17.18	$	31,699
Granted	586,644		19.93
Vested (1)	(885,381)		12.38
Non-vested grants at March 31, 2019	1,529,343		21.01		31,137

(1) During the three months ended March 31, 2019, we issued 596,650 unrestricted common units to the LTIP participants.  The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.

SERP and Directors' Compensation Plans

Compensation Plans

Summary of activity in share-based plans

	Number of units	Weighted average grant date fair value per unit		Intrinsic value
				(in thousands)
Phantom units outstanding as of January 1, 2019	635,837	$	27.34	$	11,025
Granted	16,817		18.94
Issued	(115,484)		25.20
Phantom units outstanding as of March 31, 2019	537,170		27.54		10,937

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Tables)

3 Months Ended

Mar. 31, 2019

Defined benefit pension plan

Employee Benefit Plans

Components of net periodic benefit cost

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Interest cost	$	1,216	$	1,116
Expected return on plan assets		(1,232)		(1,436)
Amortization of prior service cost		47		47
Amortization of net loss		979		969
Net periodic benefit cost (1)	$	1,010	$	696

(1) Net periodic benefit cost for the Pension Plan is included in the Other expense line item within our condensed consolidated statements of income.

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SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2019

SEGMENT INFORMATION

Schedule of reportable segment results

	Illinois						Other and		Elimination
	Basin		Appalachia		Minerals		Corporate		(1)		Consolidated
	(in thousands)
Three Months Ended March 31, 2019
Revenues - Outside	$	343,052		159,404		10,728		13,418		—	$	526,602
Revenues - Intercompany		3,997		—		—		4,277		(8,274)		—
Total revenues (2)		347,049		159,404		10,728		17,695		(8,274)		526,602
Segment Adjusted EBITDA Expense (3)		195,840		99,749		1,827		11,474		(6,033)		302,857
Segment Adjusted EBITDA (4)		121,971		58,655		9,132		19,127		(2,241)		206,644
Total assets		1,422,086		468,904		510,076		462,696		(378,632)		2,485,130
Capital expenditures (5)		47,928		33,346		—		2,769		—		84,043
Three Months Ended March 31, 2018
Revenues - Outside	$	289,518	$	147,565	$	—	$	20,039	$	—	$	457,122
Revenues - Intercompany		5,387		67		—		4,291		(9,745)		—
Total revenues (2)		294,905		147,632		—		24,330		(9,745)		457,122
Segment Adjusted EBITDA Expense (3)		181,803		92,498		—		12,798		(7,640)		279,459
Segment Adjusted EBITDA (4)		94,830		53,621		3,588		15,256		(2,105)		165,190
Total assets		1,425,798		463,857		158,675		363,632		(168,548)		2,243,414
Capital expenditures		37,448		13,376		—		701		—		51,525

(1) The elimination column represents the elimination of intercompany transactions and is primarily comprised of sales from the Matrix Group and MAC to our mining operations, coal sales and purchases between operations within different segments, sales of receivables to AROP Funding, financing between segments and insurance premiums paid to Wildcat Insurance.

(2) Revenues included in the Other and Corporate column are primarily attributable to the Matrix Group revenues, Mt. Vernon transloading revenues, administrative service revenues from affiliates, MAC revenues, Wildcat Insurance revenues and brokerage coal sales.

(3) Segment Adjusted EBITDA Expense includes operating expenses, coal purchases and other income. Transportation expenses are excluded as these expenses are passed through to our customers and consequently we do not realize any gain or loss on transportation revenues. 

Reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expenses (excluding depreciation, depletion and amortization)

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Segment Adjusted EBITDA Expense	$	302,857	$	279,459
Outside coal purchases		—		(1,374)
Other expense		(129)		(847)
Operating expenses (excluding depreciation, depletion and amortization)	$	302,728	$	277,238

Reconciliation of consolidated Segment Adjusted EBITDA to net income

	Three Months Ended
	March 31,
	2019		2018
	(in thousands)
Consolidated Segment Adjusted EBITDA	$	206,644	$	165,190
General and administrative		(17,812)		(16,651)
Depreciation, depletion and amortization		(71,139)		(61,848)
Settlement gain		—		80,000
Interest expense, net		(11,331)		(10,793)
Acquisition gain		177,043		—
Income tax benefit		106		10
Acquisition gain attributable to noncontrolling interest		(7,083)		—
Net income attributable to ARLP	$	276,428	$	155,908
Noncontrolling interest		7,176		148
Net income	$	283,604	$	156,056

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ORGANIZATION AND PRESENTATION (Details) - a		3 Months Ended
	Jan. 03, 2019	Mar. 31, 2019
AllDale I and II
Ownership interests
Ownership percentage by general partners		100.00%
Ownership percentage by limited partners		97.00%
AllDale I and II
Ownership interests
Royalty acres, net	43,000

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ORGANIZATION AND PRESENTATION - Leases (Details)	Mar. 31, 2019
Minimum
Lease term	1 year
Maximum
Lease term	20 years
Lease renewal term	10 years

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NEW ACCOUNTING STANDARDS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 22,508
Operating lease liabilities	$ 22,373
Lease, Practical Expedients, Package [true false]	true
ASU 2016-02 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 25,000
Operating lease liabilities		$ 25,000

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ACQUISITIONS - Consideration (Details) $ in Thousands		3 Months Ended
	Jan. 03, 2019 USD ($) a	Mar. 31, 2019 USD ($)	Jan. 02, 2019 USD ($)	Dec. 31, 2018 USD ($)
ACQUISITION
Previously held investment		$ 307,322
Equity method investments		28,770		$ 161,309
Acquisition gain		$ 177,043
AllDale I and II
ACQUISITION
Royalty acres, net | a	43,000
Cash	$ 175,960
Previously held investment	307,322
Total	483,282
Equity method investments			$ 130,300
Acquisition gain	$ 177,000

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ACQUISITIONS - Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 03, 2019
AllDale I and II
Assets acquired and liabilities assumed
Cash and cash equivalents		$ 900
Mineral interests		473,701
Receivables		10,602
Accounts payable		(1,921)
Net assets acquired		483,282
Noncontrolling interest fair value		$ 12,300
Bluegrass Minerals | Cavalier Minerals
Assets acquired and liabilities assumed
Noncontrolling ownership interest (as a percent)	4.00%	4.00%

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ACQUISITIONS - Pro Forma (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pro forma condensed consolidated income statement
Total revenues, As reported	$ 526,602	$ 457,122
Total revenues, Pro forma		464,881
Net income	283,604	156,056
Net income, Pro forma		$ 155,583
AllDale I and II
Acquisitions, additional information
Revenue of acquired business	10,728
Net income of acquired business	$ 4,081

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INVENTORIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
INVENTORIES
Coal	$ 47,265	$ 20,929
Supplies (net of reserve for obsolescence of $5,041 and $5,453, respectively)	38,175	38,277
Total inventories, net	85,440	59,206
Reserve for obsolescence	$ 5,041	$ 5,453

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LEASES - Lease expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
LEASES
Amortization of right-of-use assets	$ 4,521
Interest on lease liabilities	714
Operating lease cost	3,009
Short-term lease cost	190
Variable lease cost	332
Total lease cost	$ 8,766

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LEASES - Cash flow (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
LEASES
Operating cash flows for operating leases	$ 2,966
Operating cash flows for finance leases	714
Financing cash flows for finance leases	7,341	$ 6,974
Operating leases	$ 25,179

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LEASES – Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	$ 3,474,573	$ 2,925,808
Less accumulated depreciation, depletion and amortization	(1,579,588)	(1,513,450)
Total property, plant and equipment, net	1,894,985	1,412,358
Assets under finance lease
PROPERTY, PLANT AND EQUIPMENT:
Property, plant and equipment, at cost	141,019	141,019
Less accumulated depreciation, depletion and amortization	(79,097)	(74,576)
Total property, plant and equipment, net	$ 61,922	$ 66,443

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LEASES – Weighted Average (Details)	Mar. 31, 2019
LEASES
Weighted average remaining lease term of operating leases	11 years 1 month 6 days
Weighted average remaining lease term of finance leases	1 year
Weighted average discount rate of operating leases (as a percent)	6.00%
Weighted average discount rate of finance leases (as a percent)	5.20%

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LEASES – Maturities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
2019	$ 6,120
2020	3,788
2021	2,236
2022	2,172
2023	1,995
Thereafter	14,864
Total lease payments	31,175
Less imputed interest	(8,802)
Total	22,373
Finance leases
2019	40,754
2020	8,748
2021	913
2022	913
2023	140
Thereafter	560
Total lease payments	52,028
Less imputed interest	(2,052)
Total	$ 49,976

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FAIR VALUE MEASUREMENTS (Details) - Estimated fair value - Significant Observable Inputs (Level 2) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
FAIR VALUE MEASUREMENTS
Long-term debt	$ 541,274	$ 669,864
Total	$ 541,274	$ 669,864

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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Principal
Aggregate maturities of long-term debt	$ 515,000	$ 667,000
Less current maturities	(90,000)	(92,000)
Total long-term debt	425,000	575,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(10,229)	(10,996)
Total unamortized debt issuance costs	(10,229)	(10,996)
Revolving credit facility
Principal
Aggregate maturities of long-term debt	25,000	175,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(4,665)	(5,203)
Senior notes due 2025
Principal
Aggregate maturities of long-term debt	400,000	400,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(5,564)	(5,793)
Securitization Facility
Principal
Aggregate maturities of long-term debt	$ 90,000	$ 92,000

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LONG-TERM DEBT - Credit Agreement (Details) $ in Thousands		3 Months Ended
	Jan. 27, 2017 USD ($) item	Mar. 31, 2019 USD ($)
Credit Agreement
Long-Term Debt
Number of benchmarks | item	3
ARLP debt arrangements requirements, debt to cash flow ratio	2.5
ARLP debt arrangements requirements, cash flow to interest expense ratio	3.0
ARLP debt arrangements requirements, period over which the ratios are required to be maintained	12 months
Actual debt to cash flow ratio for trailing twelve months		0.81
Actual cash flow to interest expense ratio for trailing twelve months		16.6
Credit Agreement | Eurodollar Rate
Long-Term Debt
Effective interest rate (as a percent)		4.85%
Revolving credit facility
Long-Term Debt
Maximum borrowing capacity	$ 494,750
Line of credit facility, available for borrowing		$ 460,500
Annual commitment fee percentage, undrawn portion		0.35%
Letters of credit subfacility
Long-Term Debt
Maximum borrowing capacity	125,000
Letters of credit outstanding		$ 9,300
Swingline subfacility
Long-Term Debt
Maximum borrowing capacity	$ 15,000

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LONG-TERM DEBT - 2025 Senior Notes (Details) - Senior notes due 2025 $ in Millions	Apr. 24, 2017 USD ($)
Issuance of Senior Notes
Principal amount	$ 400.0
Term	8 years
Interest rate (as a percent)	7.50%
Percentage of debt that may be redeemed prior to May 1, 2020	35.00%
Redemption price expressed as a percentage of principal	107.50%

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LONG-TERM DEBT - Securitization Facility (Details) - Securitization Facility - USD ($) $ in Millions	Mar. 31, 2019	Dec. 05, 2014
Long-Term Debt
Maximum borrowing capacity		$ 100.0
Facility outstanding amount	$ 90.0

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LONG-TERM DEBT - Cavalier (Details) - Cavalier Credit Agreement - USD ($) $ in Millions	Oct. 06, 2015	Mar. 31, 2019
Long-Term Debt
Credit facility amount	$ 100.0
Line of credit facility, available for borrowing		$ 68.2
Annual commitment fee percentage, undrawn portion	0.00%
Period for initial amount of payments	2 years
Minimum
Long-Term Debt
Initial quarterly payments	$ 1.3
Quarterly payments after initial period	$ 2.5
Quarterly payments as a percentage of excess cash flow	50.00%
One-month LIBOR
Long-Term Debt
Basis spread for variable interest rate (as a percent)	6.00%

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VARIABLE INTEREST ENTITIES - Cavalier (Details) - USD ($) $ in Thousands						3 Months Ended		12 Months Ended
	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 03, 2019
Variable Interest Entities
Distributions paid to Partners	$ 69,011	$ 69,220	$ 69,239	$ 69,047	$ 68,396	$ 69,011	$ 68,396	$ 275,902
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Contributions						143,112
Distributions paid to Partners						$ 57,385
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Contributions							5,963
Distributions paid to Partners							$ 2,391
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Incentive distribution of available cash (as a percent)						25.00%
Cavalier Minerals | Bluegrass Minerals
Variable Interest Entities
Noncontrolling ownership interest (as a percent)						4.00%			4.00%
Cavalier Minerals | Alliance Minerals
Variable Interest Entities
Ownership interest in VIE (as a percent)						96.00%

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VARIABLE INTEREST ENTITIES - All Dale I and II (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Variable Interest Entities
Cash and cash equivalents	$ 30,192	$ 244,150
Trade receivables	194,538	174,914
Other receivables	2,108	395
Total property, plant and equipment, net	1,894,985	1,412,358
Other long-term assets	19,234	18,979
Accounts payable	(112,684)	(96,397)
Due to affiliates	(66)	$ (816)
AllDale I and II
Variable Interest Entities
Cash and cash equivalents	3,338
Trade receivables	7,474
Other receivables	1,415
Total property, plant and equipment, net	468,815
Other long-term assets	213
Accounts payable	(1,357)
Due to affiliates	$ (45)
AllDale I and II
Variable Interest Entities
Incentive distribution of available cash (as a percent)	20.00%
Remaining distribution (as a percent)	80.00%
AllDale I and II
Variable Interest Entities
Ownership percentage by general partners	100.00%
Ownership percentage by limited partners	97.00%

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VARIABLE INTEREST ENTITIES - All Dale III (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 28, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Equity Investments
Investments in affiliate		$ 28,770		$ 161,309
All Dale Minerals III
Equity Investments
Distribution after hurdles (as a percent)		25.00%
Specified internal rate of return (as a percent)		10.00%
Distribution of all available cash (as a percent)		125.00%
All Dale Minerals III
Equity Investments
Investments in affiliate		$ 28,770	$ 25,249	$ 28,974	$ 14,182
Distributions received		$ 528	$ 375
All Dale Minerals III | All Dale Minerals III
Equity Investments
Ownership percentage by limited partners	13.90%

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VARIABLE INTEREST ENTITIES - WKY CoalPlay (Details) - WKY CoalPlay $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Nov. 17, 2014 company
Variable Interest Entities
Number of limited liability companies related to MGP, that formed the related party together with SGP Land | company		2
Advanced royalty payment | $	$ 10.8

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INVESTMENTS - AllDale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 28, 2017
Changes in equity method investment
Beginning balance	$ 161,309
Equity method investment income	324	$ 3,736
Ending balance	28,770
All Dale Minerals III
Equity method investments, additional information
Other Commitment			$ 30,000
Changes in equity method investment
Beginning balance	28,974	14,182
Contribution to equity investee		11,400
Equity method investment income	324	42
Distributions received	(528)	(375)
Ending balance	$ 28,770	$ 25,249

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INVESTMENTS - Kodiak (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 08, 2019	Mar. 31, 2019	Dec. 31, 2018	Jul. 19, 2017
Equity securities without readily determinable fair value
Equity securities			$ 122,094
Redemption of preferred interest		$ 134,288
Kodiak
Equity securities without readily determinable fair value
Equity securities				$ 100,000
Redemption of preferred interest	$ 135,000
Gain on redemption	$ 11,500

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PARTNERS' CAPITAL - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended		12 Months Ended
	Apr. 26, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
PARTNERS' CAPITAL
Quarterly distribution paid (in dollars per unit)		$ 0.5300	$ 0.5250	$ 0.5200	$ 0.5150	$ 0.5100	$ 1.0650		$ 2.0700
Total Cash Distribution		$ 69,011	$ 69,220	$ 69,239	$ 69,047	$ 68,396	$ 69,011	$ 68,396	$ 275,902
Distribution declared (in dollars per unit)	$ 0.5350

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PARTNERS' CAPITAL - Repurchase (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	11 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	May 31, 2018
Partners' capital
Repurchase and retire authorization			$ 100,000
Number of units retired	300,970	3,985,045
Purchase of units under unit repurchase program	$ 5,251	$ 75,900
Repurchase price (in dollars per unit)		$ 19.03
Limited Partners' Capital
Partners' capital
Purchase of units under unit repurchase program	$ 5,251
Simplification Transactions
Partners' capital
Number of units retired		35

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PARTNERS' CAPITAL - Change (Details) - USD ($) $ in Thousands	3 Months Ended		11 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ 1,187,687	$ 1,151,486
Balance at beginning of period (in units)	128,095,511
Comprehensive income:
Net income	$ 283,604	156,056
Actuarially determined long-term liability adjustments	(3,584)	1,017
COMPREHENSIVE INCOME	280,020	157,073
Settlement of deferred compensation plans	(7,817)	(2,081)
Simplification Transactions fees		(1)
Purchase of units under unit repurchase program	(5,251)		$ (75,900)
Common unit-based compensation	2,743	3,006
Distributions on deferred common unit-based compensation	(1,280)	(1,062)
General Partners contributions		41
Distributions from consolidated company to affiliate noncontrolling interest	(262)	(162)
Distributions to Partners	(67,731)	(67,334)
Balance at end of period	$ 1,388,109	1,240,966	$ 1,388,109
Balance at end of period (in units)	128,391,191		128,391,191
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ (46,871)	(51,940)
Comprehensive income:
Actuarially determined long-term liability adjustments	(3,584)	1,017
Balance at end of period	(50,455)	(50,923)	$ (50,455)
Noncontrolling Interest
Increase (Decrease) in Partners's Capital
Balance at beginning of period	5,290	5,348
Comprehensive income:
Net income	7,176	148
Distributions from consolidated company to affiliate noncontrolling interest	(262)	(162)
Balance at end of period	12,204	5,334	12,204
Limited Partners' Capital
Increase (Decrease) in Partners's Capital
Balance at beginning of period	$ 1,229,268	$ 1,183,219
Balance at beginning of period (in units)	128,095,511	130,704,217
Comprehensive income:
Net income	$ 276,428	$ 154,348
Settlement of deferred compensation plans	$ (7,817)	$ (2,081)
Settlement of deferred compensation plans (in units)	596,650	199,039
Simplification Transactions fees		$ (1)
Purchase of units under unit repurchase program	$ (5,251)
Purchase of units under unit repurchase program (in units)	(300,970)
Common unit-based compensation	$ 2,743	3,006
Distributions on deferred common unit-based compensation	(1,280)	(1,062)
Distributions to Partners	(67,731)	(66,660)
Balance at end of period	$ 1,426,360	$ 1,270,769	$ 1,426,360
Balance at end of period (in units)	128,391,191	130,903,256	128,391,191
General Partner's Capital (Deficit)
Increase (Decrease) in Partners's Capital
Balance at beginning of period		$ 14,859
Comprehensive income:
Net income		1,560
General Partners contributions		41
Distributions to Partners		(674)
Balance at end of period		$ 15,786

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of revenues
Revenues	$ 526,602	$ 457,122
Coal sales
Disaggregation of revenues
Revenues	476,016	423,610
Royalties
Disaggregation of revenues
Revenues	10,728
Transportation revenues
Disaggregation of revenues
Revenues	30,238	19,785
Other sales and operating revenues
Disaggregation of revenues
Revenues	9,620	13,727
Illinois Basin
Disaggregation of revenues
Revenues	347,049	294,905
Illinois Basin | Coal sales
Disaggregation of revenues
Revenues	317,270	276,065
Illinois Basin | Transportation revenues
Disaggregation of revenues
Revenues	29,238	18,271
Illinois Basin | Other sales and operating revenues
Disaggregation of revenues
Revenues	541	569
Appalachia
Disaggregation of revenues
Revenues	159,404	147,632
Appalachia | Coal sales
Disaggregation of revenues
Revenues	157,453	145,289
Appalachia | Transportation revenues
Disaggregation of revenues
Revenues	1,000	1,514
Appalachia | Other sales and operating revenues
Disaggregation of revenues
Revenues	951	829
Minerals
Disaggregation of revenues
Revenues	10,728
Minerals | Royalties
Disaggregation of revenues
Revenues	10,728
Other and Corporate
Disaggregation of revenues
Revenues	17,695	24,330
Other and Corporate | Coal sales
Disaggregation of revenues
Revenues	5,290	7,711
Other and Corporate | Other sales and operating revenues
Disaggregation of revenues
Revenues	12,405	16,619
Operating segments
Disaggregation of revenues
Revenues	526,602	457,122
Operating segments | Illinois Basin
Disaggregation of revenues
Revenues	343,052	289,518
Operating segments | Appalachia
Disaggregation of revenues
Revenues	159,404	147,565
Operating segments | Minerals
Disaggregation of revenues
Revenues	10,728
Operating segments | Other and Corporate
Disaggregation of revenues
Revenues	13,418	20,039
Elimination
Disaggregation of revenues
Revenues	(8,274)	(9,745)
Elimination | Coal sales
Disaggregation of revenues
Revenues	(3,997)	(5,455)
Elimination | Other sales and operating revenues
Disaggregation of revenues
Revenues	(4,277)	(4,290)
Elimination | Illinois Basin
Disaggregation of revenues
Revenues	3,997	5,387
Elimination | Appalachia
Disaggregation of revenues
Revenues		67
Elimination | Other and Corporate
Disaggregation of revenues
Revenues	$ 4,277	$ 4,291

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Coal supply contracts (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Performance obligations unsatisfied or partially unsatisfied
Total	$ 2,422,264
Illinois Basin
Performance obligations unsatisfied or partially unsatisfied
Total	1,613,447
Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	804,505
Other and Corporate
Performance obligations unsatisfied or partially unsatisfied
Total	17,349
Elimination
Performance obligations unsatisfied or partially unsatisfied
Total	(13,037)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 1,309,642
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Illinois Basin
Performance obligations unsatisfied or partially unsatisfied
Total	$ 813,839
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	$ 491,491
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Other and Corporate
Performance obligations unsatisfied or partially unsatisfied
Total	$ 17,349
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 | Elimination
Performance obligations unsatisfied or partially unsatisfied
Total	$ (13,037)
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 817,035
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Illinois Basin
Performance obligations unsatisfied or partially unsatisfied
Total	$ 560,253
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 | Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	$ 256,782
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 280,900
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Illinois Basin
Performance obligations unsatisfied or partially unsatisfied
Total	$ 239,355
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	$ 41,545
Expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Performance obligations unsatisfied or partially unsatisfied
Total	$ 14,687
Expected timing of satisfaction period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Appalachia
Performance obligations unsatisfied or partially unsatisfied
Total	$ 14,687
Expected timing of satisfaction period

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NET INCOME OF ARLP PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income of ARLP	$ 276,428	$ 155,908
General partner's equity ownership		(1,560)
LIMITED PARTNERS' INTEREST IN NET INCOME OF ARLP	276,428	154,348
Distributions to participating securities	(1,105)	(1,271)
Undistributed earnings attributable to participating securities	(3,522)	(1,548)
Net income of ARLP available to limited partners	$ 271,801	$ 151,529
Weighted-average limited partner units outstanding – basic and diluted	128,149,791	130,819,217
Basic and diluted net income of ARLP per limited partner unit (in dollars per unit)	$ 2.12	$ 1.16
Anti-dilutive under the treasury stock method (in units)	1,365,000	1,532,000
MGP | Intermediate Partnership
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Ownership percentage by general partners		1.0001%
MGP | Alliance Coal
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Ownership percentage by general partners		0.001%

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Workers' Compensation Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 49,539	$ 54,439
Accruals increase	1,961	2,641
Payments	(3,473)	(2,797)
Interest accretion	401	363
Ending balance	48,428	$ 54,646
Receivables for traumatic injury claims	$ 8,100

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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Periodic Benefit Cost (Details) - Pneumoconiosis benefits - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accrued Workers Compensation And Pneumoconiosis Benefits
Service cost	$ 645	$ 630
Interest cost	760	635
Net amortization	(1,145)	1
Net periodic benefit cost	$ 260	$ 1,266

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COMPENSATION PLANS - LTIP Grants Activity (Details) - ARLP LTIP - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Number of units
Balance at the beginning of the period (in units)	1,828,080
Granted (in units)	586,644
Vested (in units)	(885,381)
Balance at the end of the period (in units)	1,529,343
Weighted average grant date fair value per unit
Balance at the beginning of the period (in dollars per unit)	$ 17.18
Granted (in dollars per unit)	19.93
Vested (in dollars per unit)	12.38
Balance at the end of the period (in dollars per unit)	$ 21.01
Intrinsic value (in dollars)
Intrinsic value of outstanding grants (in dollars)	$ 31,137	$ 31,699
Other information
Common units issued upon vesting	596,650

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COMPENSATION PLANS - LTIP Other Information (Details) - ARLP LTIP - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other information
Unit-based compensation expense	$ 2.4	$ 2.7
Total unit-based obligation recorded	12.3
Unrecognized compensation expense (in dollars)	$ 19.8
Weighted-average period for recognition of expense	1 year 9 months 18 days
Units for which vesting requirements were deemed satisfied	885,381
Common units issued upon vesting	596,650
Units available for grant	1,900,000

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COMPENSATION PLANS - SERP and Directors Compensation Activity (Details) - SERP and Directors' Compensation Plans - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other information
Unit-based compensation expense		$ 400
Total unit-based obligation recorded	$ 14,800
Phantom Share Units (PSUs)
Summary of units
Balance at the beginning of the period (in units)	635,837
Granted (in units)	16,817
Issued (in units)	(115,484)
Balance at the end of the period (in units)	537,170
Weighted average grant date fair value per unit
Balance at the beginning of the period (in dollars per unit)	$ 27.34
Granted (in dollars per unit)	18.94
Issued (in dollars per unit)	25.20
Balance at the end of the period (in dollars per unit)	$ 27.54
Intrinsic value (in dollars)
Intrinsic value of outstanding grants (in dollars)	$ 10,937		$ 11,025

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COMPONENTS OF PENSION PLAN NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2018
Defined benefit pension plan
Components of net periodic benefit cost:
Interest cost		$ 1,216	$ 1,116
Expected return on plan assets		(1,232)	(1,436)
Amortization of prior service cost		47	47
Amortization of net loss		979	969
Net periodic benefit cost		1,010	$ 696
2018 plan year
Components of net periodic benefit cost:
Employer contribution		$ 1,200
2019 plan year
Components of net periodic benefit cost:
Employer contribution	$ 1,100

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SEGMENT INFORMATION - General (Details)	3 Months Ended
	Mar. 31, 2019 segment
SEGMENT INFORMATION
Number of reportable segments	3

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SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reportable segment results
Total revenues, As reported	$ 526,602	$ 457,122
Segment Adjusted EBITDA Expense	302,857	279,459
Segment Adjusted EBITDA	206,644	165,190
Total assets	2,485,130	2,243,414	$ 2,394,748
Capital expenditures	84,043	51,525
Illinois Basin
Reportable segment results
Total revenues, As reported	347,049	294,905
Segment Adjusted EBITDA Expense	195,840	181,803
Segment Adjusted EBITDA	121,971	94,830
Total assets	1,422,086	1,425,798
Capital expenditures	47,928	37,448
Appalachia
Reportable segment results
Total revenues, As reported	159,404	147,632
Segment Adjusted EBITDA Expense	99,749	92,498
Segment Adjusted EBITDA	58,655	53,621
Total assets	468,904	463,857
Capital expenditures	33,346	13,376
Minerals
Reportable segment results
Total revenues, As reported	10,728
Segment Adjusted EBITDA Expense	1,827
Segment Adjusted EBITDA	9,132	3,588
Total assets	510,076	158,675
Other and Corporate
Reportable segment results
Total revenues, As reported	17,695	24,330
Segment Adjusted EBITDA Expense	11,474	12,798
Segment Adjusted EBITDA	19,127	15,256
Total assets	462,696	363,632
Capital expenditures	2,769	701
Operating segments
Reportable segment results
Total revenues, As reported	526,602	457,122
Operating segments | Illinois Basin
Reportable segment results
Total revenues, As reported	343,052	289,518
Operating segments | Appalachia
Reportable segment results
Total revenues, As reported	159,404	147,565
Operating segments | Minerals
Reportable segment results
Total revenues, As reported	10,728
Operating segments | Other and Corporate
Reportable segment results
Total revenues, As reported	13,418	20,039
Elimination
Reportable segment results
Total revenues, As reported	(8,274)	(9,745)
Segment Adjusted EBITDA Expense	(6,033)	(7,640)
Segment Adjusted EBITDA	(2,241)	(2,105)
Total assets	(378,632)	(168,548)
Elimination | Illinois Basin
Reportable segment results
Total revenues, As reported	3,997	5,387
Elimination | Appalachia
Reportable segment results
Total revenues, As reported		67
Elimination | Other and Corporate
Reportable segment results
Total revenues, As reported	$ 4,277	$ 4,291

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SEGMENT INFORMATION - EBITDA Expense Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of consolidated Segment Adjusted EBITDA Expense to operating expenses (excluding depreciation, depletion and amortization)
Segment Adjusted EBITDA Expense	$ 302,857	$ 279,459
Outside coal purchases		(1,374)
Other expense	(129)	(847)
Operating expenses (excluding depreciation, depletion and amortization)	$ 302,728	$ 277,238

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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA	$ 206,644	$ 165,190
General and administrative	(17,812)	(16,651)
Depreciation, depletion and amortization	(71,139)	(61,848)
Settlement gain		80,000
Interest expense, net	(11,331)	(10,793)
Acquisition gain	177,043
Income tax (expense) benefit	106	10
Acquisition gain attributable to noncontrolling interest	(7,083)
NET INCOME ATTRIBUTABLE TO ALLIANCE RESOURCE PARTNERS, L.P. ("NET INCOME OF ARLP")	276,428	155,908
Noncontrolling interest	7,176	148
Net income	$ 283,604	$ 156,056