Westmoreland Resource Partners (WMLPQ) 10-Q 28 Apr 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 23, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	Westmoreland Resource Partners, LP
Entity Central Index Key	1412347
Current Fiscal Year End Date	-19
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		5,711,630

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Successor [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash	$1,785	$5,921
Receivables:
Trade	23,560	22,710
Other	116	116
Receivables, Net, Current	23,676	22,826
Inventory	12,696	14,013
Other current assets	2,637	1,317
Total current assets	40,794	44,077
Property, plant and equipment:
Property, Plant and Equipment, Gross	206,942	205,744
Less accumulated depreciation, depletion and amortization	-9,801	0
Net property, plant and equipment	197,141	205,744
Advanced coal royalties	11,498	9,153
Restricted investments and bond collateral	9,534	10,621
Intangible assets, net of accumulated amortization of $0.5 million and $0 in March 31, 2015 and December 31, 2014, respectively	30,483	31,000
Deferred financing costs, net	6,607	6,993
Total Assets	296,057	307,588
Current liabilities:
Current installments of long-term debt	6	6
Accounts payable and accrued expenses:
Trade	19,469	19,135
Production taxes	975	1,033
Accrued compensation	401	1,531
Asset retirement obligations	9,855	7,783
Other current liabilities	1,434	4,007
Total current liabilities	32,140	33,495
Long-term debt, less current installments	176,354	175,029
Asset retirement obligations, less current portion	22,714	23,902
Warrants	1,952	1,981
Other liabilities	160	160
Total liabilities	233,320	234,567
Partners' capital:
Limited partners (5,711,630 and 5,505,087 units outstanding as of March 31, 2015 and December 31, 2014, respectively)	29,328	39,549
General partner (35,291 units outstanding as of March 31, 2015 and December 31, 2014)	33,409	33,472
Total partners’ capital	62,737	73,021
Total liabilities and partners’ capital	296,057	307,588
Land and Mineral Rights [Member]
Property, plant and equipment:
Property, Plant and Equipment, Gross	72,993	71,715
Property, Plant and Equipment [Member]
Property, plant and equipment:
Property, Plant and Equipment, Gross	$133,949	$134,029

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (Successor [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Successor [Member]
Accumulated Amortization	$0.50	$0
Limited partner capital account, units outstanding	5,711,630	5,505,087
General partner capital account, units outstanding	35,291	35,291

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Successor [Member]
Revenues:
Coal revenues	$61,750
Royalty revenues	1,870
Non-coal revenues	3,947
Total Revenues	67,567
Costs and expenses:
Cost of coal revenues (excluding depreciation, depletion and amortization)	54,651
Cost of non-coal revenues	3,155
Depreciation, depletion and amortization	10,180
Selling and administrative	2,548
Loss on sale/disposal of assets	1,034
Restructuring charges	553
Total cost and expenses	72,121
Operating loss	-4,554
Other (expense) income:
Interest expense	-5,780
Interest income	0
Change in fair value of warrants	29
Total other expenses	-5,751
Net loss	-10,305
Less net loss attributable to noncontrolling interest	0
Net loss attributable to WMLP unitholders	-10,305
Less net loss allocated to general partner	-63
Net loss allocated to limited partners	-10,242
Net loss per limited partner unit:
Basic (dollars per share)	($1.74)
Diluted (dollars per share)	($1.74)
Weighted average number of limited partner units outstanding:
Basic (shares)	5,878,187
Diluted (shares)	5,878,187
Predecessor [Member]
Revenues:
Coal revenues		76,770
Royalty revenues		99
Non-coal revenues		1,135
Total Revenues		78,004
Costs and expenses:
Cost of coal revenues (excluding depreciation, depletion and amortization)		65,726
Cost of non-coal revenues		402
Depreciation, depletion and amortization		11,224
Selling and administrative		3,656
Loss on sale/disposal of assets		204
Restructuring charges		75
Total cost and expenses		81,287
Operating loss		-3,283
Other (expense) income:
Interest expense		-6,870
Interest income		1
Change in fair value of warrants		-415
Total other expenses		-7,284
Net loss		-10,567
Less net loss attributable to noncontrolling interest		381
Net loss attributable to WMLP unitholders		-10,186
Less net loss allocated to general partner		-202
Net loss allocated to limited partners		($9,984)
Net loss per limited partner unit:
Basic (dollars per share)		($4.92)
Diluted (dollars per share)		($4.92)
Weighted average number of limited partner units outstanding:
Basic (shares)		2,055,033
Diluted (shares)		2,055,033

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Partners' Capital (USD $)	Total	Successor [Member]	Common Units [Member]	Liquidation [Member]	Limited Partners [Member]	General Partner [Member]
In Thousands, except Share data, unless otherwise specified		USD ($)	Successor [Member]	Successor [Member]	Successor [Member]	Successor [Member]
			USD ($)	USD ($)	USD ($)	USD ($)
Balance at Dec. 31, 2014		$73,021	$39,549	$0	$39,549	$33,472
Balance (units) at Dec. 31, 2014			5,505,087	856,698	6,361,785	35,291
Increase (Decrease) in Partners' Capital [Roll Forward]
Net (loss) income		-10,305	-10,242	0	-10,242	-63
Common unit distributions (units)			206,543		206,543
Equity-based compensation		21	21	0	21
Balance at Mar. 31, 2015		$62,737	$29,328	$0	$29,328	$33,409
Balance (units) at Mar. 31, 2015			5,711,630	856,698	6,568,328	35,291

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Successor [Member]
Cash flows from operating activities:
Net loss	($10,305)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	10,180
Accretion of asset retirement obligations	804
Restructuring charges	553
Equity-based compensation	21
Loss on sale/disposal of assets	1,034
Non-cash interest expense	1,327
Amortization of deferred financing costs	405
Other	-29
Changes in operating assets and liabilities:
Receivables, net	-850
Inventories	1,317
Accounts payable and accrued expenses	276
Accrued compensation	-1,130
Asset retirement obligations	-818
Other assets and liabilities	-3,165
Net cash (used in) provided by operating activities	-380
Cash flows from investing activities:
Additions to property, plant, equipment and other	-4,842
Change in restricted investments and bond collateral	1,087
Net proceeds from sales of assets	19
Net cash used in investing activities	-3,736
Cash flows from financing activities:
Repayments of long-term debt	-2
Borrowings on revolving lines of credit	0
Repayment on revolving lines of credit	0
Debt issuance costs and other refinancing costs	-18
Net cash (used in) provided by financing activities	-20
Net increase (decrease) in cash and cash equivalent	-4,136
Cash and cash equivalents, beginning of the year	5,921
Cash and cash equivalents, end of the year	1,785
Supplemental disclosures of cash flow information:
Cash paid for interest	4,047
Non-cash transactions:
Asset retirement obligations capitalized in mine development	1,038
Market value of common units vested in LTIP	0
Predecessor [Member]
Cash flows from operating activities:
Net loss		-10,567
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization		11,224
Accretion of asset retirement obligations		565
Restructuring charges		75
Equity-based compensation		456
Loss on sale/disposal of assets		204
Non-cash interest expense		1,862
Amortization of deferred financing costs		946
Other		415
Changes in operating assets and liabilities:
Receivables, net		-1,432
Inventories		-1,894
Accounts payable and accrued expenses		610
Accrued compensation		34
Asset retirement obligations		-612
Other assets and liabilities		-1,069
Net cash (used in) provided by operating activities		817
Cash flows from investing activities:
Additions to property, plant, equipment and other		-2,622
Change in restricted investments and bond collateral		549
Net proceeds from sales of assets		294
Net cash used in investing activities		-1,779
Cash flows from financing activities:
Repayments of long-term debt		0
Borrowings on revolving lines of credit		6,500
Repayment on revolving lines of credit		-4,000
Debt issuance costs and other refinancing costs		9
Net cash (used in) provided by financing activities		2,509
Net increase (decrease) in cash and cash equivalent		1,547
Cash and cash equivalents, beginning of the year		3,089
Cash and cash equivalents, end of the year		4,636
Supplemental disclosures of cash flow information:
Cash paid for interest		4,075
Non-cash transactions:
Asset retirement obligations capitalized in mine development		-158
Market value of common units vested in LTIP		$180

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION
	The accompanying unaudited condensed consolidated financial statements include the accounts and operations of Westmoreland Resources Partners, LP, or the Partnership, and its consolidated subsidiaries and are prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”) and require use of management's estimates. The financial information contained in this Form 10-Q is unaudited, but reflects all adjustments, which are, in the opinion of management, necessary for a fair presentation of the financial information for the periods shown. Such adjustments are of a normal recurring nature. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of results to be expected for the year ending December 31, 2015.
	Westmoreland Coal Company's ("WCC") cost of acquiring our General Partner, Westmoreland Resources GP, LLC, ("GP") has been pushed-down to establish a new accounting basis for us beginning in the last minutes of the year ended December 31, 2014. Accordingly, the accompanying condensed consolidated financial statements are presented for two periods, Predecessor and Successor, which relate to the accounting periods preceding and succeeding the completion of the transaction. The Predecessor and Successor periods have been separated by a vertical line on the face of the condensed consolidated financial statements to highlight the facts that the financial information for such periods has been prepared under two different historical-cost bases of accounting.
	Significant Relationships Referenced in Notes to Consolidated Financial Statements
	•	“We,” “us,” “our,” “WMLP,” or the "Partnership” means the business and operations of Westmoreland Resource Partners, LP, the parent entity, as well as its consolidated subsidiaries.
	•	Our “GP” means Westmoreland Resources GP, LLC, the general partner of Westmoreland Resource Partners, LP.
	Organization
	Westmoreland Resource Partners, LP is a Delaware limited partnership formed in August 2007. We are a low-cost producer and marketer of high-value thermal coal to United States (“U.S.”) utilities and industrial users, and we are the largest producer of surface mined coal in Ohio. We market our coal primarily to large electric utilities with coal-fired, base-load scrubbed power plants under long-term coal sales contracts. We focus on acquiring thermal coal reserves that we can efficiently mine with our large-scale equipment. Our reserves and operations are strategically located to serve our primary market area of Indiana, Kentucky, Michigan, Ohio, Pennsylvania and West Virginia. Additionally we hold fee simple interest in coal reserves in Lincoln County, Wyoming for which we have entered into a coal mining lease with a subsidiary of WCC pursuant to which we earn a per ton royalty as these coal reserves are mined.
	We operate in a single business segment and have four operating subsidiaries, Oxford Mining Company, LLC, Oxford Mining Company-Kentucky, LLC, Westmoreland Kemmerer Fee Coal Holdings, LLC ("WKFCH") and Harrison Resources, LLC. All of our operating subsidiaries participate primarily in the business of utilizing surface mining techniques to mine domestic coal and prepare it for sale to our customers or lease our controlled coal reserves to others to mine.
	We are managed by WCC through our GP and all executives, officers and employees who provide services to us are employed by either WCC or our GP. WCC directly owns our GP. WCC’s common stock trades on the NASDAQ Global Market under the symbol “WLB.”
	As of April 23, 2015, WCC and its consolidated subsidiaries owned, through their limited and general partner interests in us, an approximate 79% interest in us. In addition to any distributions it receives, directly or indirectly, from its limited and general partner interests, WCC holds, indirectly, the incentive distribution rights in us held by our GP.
	Significant Accounting Policies
	There were no changes to our significant accounting policies from those disclosed in the audited consolidated financial statements and notes thereto contained in our Annual Report on Form 10-K for the year ended December 31, 2014 (the "2014 Form 10-K").
	Special Distribution to Public Unitholders
	In January 2015, as previously announced, we made a one-time special distribution of 206,543 common units of WMLP, representing an approximate 25% distribution, to our public unitholders on a pro rata basis.
	Recently Adopted Accounting Pronouncements
	In April 2014, the FASB issued ASU 2014-8, Presentation of Financial Statements and Property, Plant and Equipment, which changes the presentation of discontinued operations on the statements of operations and other requirements for reporting discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results when the component meets the criteria to be classified as held for sale or is disposed. The amendments in this update also require additional disclosures about discontinued operations and disposal of an individually significant component of an entity that does not qualify for discontinued operations. The new guidance is effective for interim and annual periods beginning after December 15, 2014. We adopted ASU 2014-8 effective January 1, 2015.
	In August 2014, the FASB issued ASU 2014-17, Pushdown Accounting, which allows entities the option to elect pushdown of purchase accounting each time there is a change-in-control event in which an acquirer obtains control of an acquiree. If an acquiree does not initially elect to apply pushdown accounting upon a change-in-control event, it can subsequently elect to apply pushdown accounting to its most recent change-in-control event in a later reporting period as a change in accounting principle. Once made, the election to apply pushdown accounting is irrevocable. Entities applying pushdown accounting are required to measure the individual assets and liabilities of the acquired entity based on the measurement guidance in ASC 805, including the recognition of goodwill. However, any bargain purchase gain recognized by the acquirer should not be recognized in the acquiree’s income statement, but rather as an adjustment to additional paid-in capital. Acquisition-related debt is recognized by the acquiree only if the acquired entity is required to recognize a liability for debt in accordance with other applicable guidance. See our application of ASU 2014-17 in Note 2.
	In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which requires that debt issuance costs related to a recognized liability, be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The new guidance should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. These disclosures include the nature of and reason for the change in accounting principle, the transition method, a description of the prior-period information that has been retrospectively adjusted, and the effect of the change on the financial statement line items (i.e., debt issuance cost asset and the debt liability). The new guidance is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years, with early adoption permitted for financial statements that have not been previous issued. Management projects the impact to the financial statements resulting in balance sheet reclassification for which the Deferred financing costs, net account is recharacterized as a a contra-liability reducing the Long-term debt, less current installments balance for each of the respective periods upon adoption.
	In May 2014, the FASB issued ASU 2014-9, Revenue From Contracts With Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The ASU is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration which the entity expects to be entitled to receive in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. In April 2015, the FASB agreed to propose a one-year deferral of the revenue recognition standard's effective date. The new guidance is now effective for the interim and annual periods beginning after December 15, 2017; early application is permitted, but not before the original effective date (annual reporting periods beginning after December 15, 2016). We are currently assessing the impact that this standard will have on our consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. Under GAAP, financial statements are prepared based on the presumption that the reporting organization will continue to operate as a going concern, except in limited circumstances. Financial reporting under this presumption is commonly referred to as the going concern basis of accounting. The going concern basis of accounting is critical to financial reporting because it establishes the fundamental basis for measuring and classifying assets and liabilities. Currently, GAAP lacks guidance about management’s responsibility to evaluate whether there is substantial doubt about the organization’s ability to continue as a going concern or to provide related footnote disclosures. This ASU provides guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations today in the financial statement footnotes. The new guidance is effective for the interim and annual periods beginning after December 15, 2016; early adoption is permitted for annual or interim reporting periods for which the financial statements have not previously been issued.
	Reclassifications
	Certain prior-year amounts have been reclassified in our condensed statements of operations and statements of cash flows for the three months ended March 31, 2014 to conform with the financial statement line items used by our GP's parent, WCC.

Acquisition_and_Pushdown_Accou

Acquisition and Pushdown Accounting	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisition and Pushdown Accounting	ACQUISITION AND PUSHDOWN ACCOUNTING
	On December 31, 2014, pursuant to a Purchase Agreement dated October 16, 2014, WCC acquired, for $33.5 million in cash, 100% of the equity of our GP from (i) the holders of all of our GP’s outstanding Class A Units, AIM Oxford Holdings, LLC ("AIM") and C&T Coal, Inc. ("C&T"), (ii) the holders of all of our GP’s outstanding Class B Units, certain former executives of our GP, and (iii) the holders of all of the outstanding warrants for our GP’s Class B Units, the Warrantholders. At the same time, WCC also acquired, for no additional consideration, (i) 100% of the Partnership’s outstanding subordinated units from AIM and C&T, which subordinated units were then converted to liquidation units, and (ii) 100% of the Partnership’s outstanding warrants for subordinated units from the Warrantholders, which warrants were then canceled by WCC.
	The purchase consideration for our GP and control of our GP’s consolidated subsidiaries is estimated at $238.3 million, which included $33.5 million paid in cash, plus the assumption of approximately $194.0 million of liabilities.
	The acquisition of our GP was accounted for by WCC under the acquisition method of accounting that requires the total purchase consideration to be allocated to the assets acquired and liabilities assumed based on estimates of fair value. We have elected to apply pushdown accounting to our consolidated financial statements. By applying pushdown accounting, our financial statements also reflect these adjustments to fair value with a portion allocated to noncontrolling interest for the portion of us that is not owned directly by WCC.
	The allocation of the purchase price is preliminary pending the completion of various analyses and the finalization of estimates. During the measurement period (which is not to exceed one year from the acquisition date), additional assets or liabilities may be recognized if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in the recognition of those assets or liabilities as of that date. The preliminary allocation may be adjusted after obtaining additional information regarding, among other things, asset valuations, liabilities assumed and revisions of previous estimates. These adjustments may be significant and will be accounted for retrospectively.
	A summary of the estimated purchase consideration and a preliminary allocation of the estimated purchase consideration is as follows (in millions):
	Estimated purchase consideration
	Market value of limited partners' units	$	10.8
	Cash paid	33.5
	Total consideration	$	44.3
	Estimated fair value of liabilities assumed:
	Debt	$	160.1
	Asset retirement obligations	31.7
	Other liabilities	0.2
	Warrants	2
	Total estimated fair value of liabilities assumed	194
	Total estimated purchase consideration:	$	238.3
	Preliminary allocation of estimated purchase consideration:
	Working capital	$	14.7
	Land and mineral rights	38.6
	Plant and equipment	134
	Advanced coal royalities	9.2
	Restricted investments and bond collateral	10.6
	Intangible asset	31
	Other assets	0.2
	Total preliminary allocation of estimated purchase consideration:	$	238.3

Inventory

Inventory	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory	INVENTORY
	Inventory consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,		December 31,
		2015		2014
	Coal	$	5,206	$	6,590
	Fuel inventory	1,545		1,860
	Materials and supplies	5,945		5,563
	Total	$	12,696	$	14,013

Restructuring_Charges

Restructuring Charges	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring Charges	RESTRUCTURING CHARGES
	Concurrent with the WCC transactions completed in December 2014 (the "WCC Transactions"), a restructuring plan was initiated to streamline operations and eliminate duplicate roles and responsibilities between us and WCC. As of December 31, 2014, we recorded restructuring charges for employee termination benefits of $2.8 million. and incurred an additional restructuring cost of $0.6 million for the three months ended March 31, 2015. We expect to incur $0.1 million of additional restructuring costs as we complete our restructuring plan throughout the first half of 2015.
	WCC Transactions restructuring accrual activity is summarized as follows:
		Westmoreland Resource Partners, LP
		(Successor)
		As of December 31, 2014		Three Months Ended March 31, 2015					As of March 31, 2015
		Liability		Charges		Payments			Liability
	Severance and other termination costs	$	2,783	$	553	$	(2,943	)	$	393
	The following table summarizes the total WCC Transactions restructuring charges incurred over the course of the restructuring:
		Westmoreland Resource Partners, LP
		(Successor)
		Charges
		For the Three Months Ended March 31, 2015		Incurred Through March 31,		Total Expected
				2015		Restructuring Expenses
	Severance and other termination costs	$	553	$	3,336	$	3,436

Other_Current_Assets

Other Current Assets	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	OTHER CURRENT ASSETS
	Other current assets consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,		December 31,
		2015		2014
	Prepaid Insurance	$	1,829	$	418
	Other	808		899
	Total	$	2,637	$	1,317

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Disclosure Text Block [Abstract]
Long-Term Debt	LONG-TERM DEBT
	Debt consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,			December 31,
		2015			2014
	First lien debt:
	Term loan	$	175,000		$	175,000
	Paid-in-kind interest	1,327			—
	Total first lien debt	176,327			175,000
	Notes payable	33			35
	Total debt	176,360			175,035
	Less current portion	(6		)	(6		)
	Long-term debt	$	176,354		$	175,029
	Credit Facilities Generally
	On December 31, 2014, we closed on a new credit facility under a Financing Agreement (the “2014 Financing Agreement”) with the lenders party thereto and U.S. Bank National Association as Administrative and Collateral Agent. The new credit facility consists of a $175 million term loan, with an option for up to $120 million in additional term loans for acquisitions if requested by us and approved by the issuing lenders. The new credit facility matures in December 2018. The 2014 Financing Agreement contains customary financial and other covenants. Borrowings under the 2014 Financing Agreement are secured by substantially all of our physical assets. Proceeds of the new credit facility were used to retire our then existing first and second lien credit facilities and to pay fees and expenses related to our new credit facility, with the limited amount of remaining proceeds being available as working capital.
	As of March 31, 2015, we had a term loan of $176.3 million outstanding under the 2014 Financing Agreement. Borrowings on such term loan bear interest at a variable rate per annum equal to, at our option, the London Interbank Offered Rate (as defined in the 2014 Financing Agreement) (“LIBOR”) (floor of 0.75% plus 8.5%) or the Reference Rate (as defined in the 2014 Financing Agreement). As of March 31, 2015, the 2014 Financing Agreement had a cash interest rate of 9.25%, consisting of the LIBOR floor (0.75%) plus 8.5%.
	The 2014 Financing Agreement also provides for “PIK Interest” (paid-in-kind interest as defined in the 2014 Financing Agreement) at a variable rate per annum between 1.00% and 3.00% based on our total net leverage ratio (as defined in the 2014 Financing Agreement). The rate of PIK Interest is recalculated on a quarterly basis with the PIK Interest added quarterly to the then-outstanding principal amount of the term loan under the 2014 Financing Agreement. PIK Interest under the 2014 Financing Agreement was $1.3 million for the three months ended March 31, 2015.
	As of March 31, 2015, we were in compliance with all covenants under the terms of the 2014 Financing Agreement.
	Deferred Financing Costs
	We capitalized costs that represented fees paid to lenders and advisors and for legal services included in Deferred financing costs, net. Deferred financing costs are amortized over the life of the agreement, included in interest expense, using the effective interest rate method. Amortization of deferred financing costs was $0.4 million and $0.9 million for the three months ended March 31, 2015 and 2014, respectively.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS
	The book values of cash, accounts receivable, restricted investment and bond collateral, and accounts payable are considered to be representative of their respective fair values because of the immediate short-term maturity of these financial instruments. The fair value of the restricted investment and bond collateral and warrants were determined based upon a market approach and approximates the carrying value at March 31, 2015.
	The warrants are fair valued at each balance sheet date using the Black-Scholes model. As of March 31, 2015, the fair value of each warrant was $11.72, based on the following assumptions: spot price of $11.84 per unit, exercise price of $0.12 per unit, term of 3.25 years, volatility of 83.0% and a three-year treasury rate of 0.9%.
	The fair value of the restricted investment and bond collateral are Level 1 and warrants are a Level 2 measurement.

Asset_Retirement_Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS
	As of March 31, 2015, our asset retirement obligation ("ARO") totaled $32.6 million, including amounts reported as current liabilities. While the precise amount of these future costs cannot be determined with certainty, we estimate that, as of March 31, 2015, the aggregate undiscounted cost of our final ARO is $42.5 million.
	Changes in the Partnership's asset retirement obligations were as follows:
		Westmoreland Resource Partners, LP			Oxford Resource Partners, LP
		(Successor)			(Predecessor)
		Three Months Ended			Three Months Ended
		March 31, 2015			March 31, 2014
	Asset retirement obligations, January 1,	$	31,685		$	31,654
	Accretion	804			565
	Changes resulting from additional mines	442			—
	Changes due to amount and timing of reclamation	596			(188		)
	Payments	(958		)	(615		)
	Asset retirement obligations, March 31,	32,569			31,416
	Less current portion	(9,855		)	(7,420		)
	Asset retirement obligations, less current portion	$	22,714		$	23,996

UnitBased_Compensation

Unit-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unit-Based Compensation	UNIT-BASED COMPENSATION
	We grant employees and non-employee directors restricted common units under our Long-Term Incentive Plan (“LTIP”).
	We recognized compensation expense from unit-based arrangements shown in the following table:
		Westmoreland Resource Partners, LP				Oxford Resource Partners, LP
		(Successor)				(Predecessor)
		Three Months Ended				Three Months Ended
		March 31, 2015				March 31, 2014
	Recognition of fair value of restricted common units over the vesting period	$	21			$	456
	A summary of restricted common unit award activity for the three months ended March 31, 2015 is as follows:
		Westmoreland Resource Partners, LP
		(Successor)
		Units		Weighted Average Grant-Date Fair Value				Unamortized Compensation Expense
								(in thousands)
	Non-vested at December 31, 2014	—		$	—
	Granted	21,930		11.4
	Vested	—		—
	Non-vested at March 31, 2015	21,930		$	11.4			$	229	1
	1Expected to be recognized over the next 11 months.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	Coal Sales Contracts
	We are committed under long-term contracts to sell coal that meets certain quality requirements at specified prices. Many of these prices are subject to cost pass-through or cost adjustment provisions that mitigate some risk from rising costs. Quantities sold under some of these contracts may vary from year to year within certain limits at the option of the customer or us. As of March 31, 2015, the remaining terms of our long-term contracts range from one to three years.
	Purchase Commitments
	From time to time, we purchase coal from third parties in order to meet quality or delivery requirements under our customer contracts. We buy coal on the spot market, and the cost of that coal is dependent upon the market price and quality of the coal.
	Surety and Performance Bonds
	As of March 31, 2015, we had $32.1 million in surety bonds outstanding to secure certain reclamation obligations which were collateralized by cash deposits of $8.0 million. Such cash collateral is included in Restricted investments and bond collateral on our consolidated balance sheets and Change in restricted investments and bond collateral within investing activities on our consolidated statements of cash flow. Additionally, we had road bonds totaling $0.5 million and performance bonds totaling $2.9 million outstanding to secure contractual performance. We believe these bonds will expire without any claims or payments thereon and therefore will not have a material adverse effect on our financial position, liquidity or operations.
	Legal
	From time to time, we are involved in various legal proceedings arising in the ordinary course of business. We accrue for such liabilities when it is probable that future costs (including legal fees and expenses) will be incurred and such costs can be reasonably estimated. Accruals are based on developments to date; management's estimates of the outcomes of these matters; our experience in contesting, litigating and settling similar matters; and any related insurance coverage. While the ultimate outcome of these proceedings cannot be predicted with certainty, we have accrued $0.6 million to resolve various claims as of March 31, 2015, of which $0.1 million, net, was accrued during 2015.
	Guarantees
	Our GP and the Partnership guarantee certain obligations of our subsidiaries. We believe that these guarantees will expire without any liability to the guarantors, and therefore will not have a material adverse effect on our financial position, liquidity or operations.

Earnings_Losses_Per_Unit

Earnings (Losses) Per Unit	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings (Losses) Per Unit	EARNINGS (LOSSES) PER UNIT
	The computation of basic and diluted earnings (losses) per unit under the two class method for limited partner units and general partner units is presented as follows:
		Westmoreland Resource Partners, LP			Oxford Resource Partners, LP
		(Successor)			(Predecessor)
		Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	Limited partner units
	Average units outstanding basic and diluted1, 2	5,878,187			2,055,033
	Net loss allocated to limited partners basic and diluted2	$	(10,244	)	$	(10,014	)
	Net loss per limited partner unit basic and diluted2	$	(1.74	)	$	(4.92	)
	General partner units
	Average units outstanding basic and diluted	35,291			35,291
	Net loss allocated to general partners basic and diluted2	$	(61	)	$	(172	)
	Net loss per general partner unit basic and diluted	$	(1.74	)	$	(4.92	)
	1Unvested LTIP units are not dilutive units for the years and periods presented herein, but could be in the future. Anti-dilutive units are not used in calculating diluted average units.
	2Reflects the impact of the outstanding common unit warrants for the three months ended March 31, 2015 and 2014, respectively..

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS
	In connection with our formation in August 2007, the Partnership and Oxford Mining entered into an administrative and operational services agreement (the “Services Agreement”) with our GP, which agreement was amended in February 2015. The Services Agreement is terminable by either party upon thirty days’ written notice. Under the terms of the Services Agreement, our GP provides services through its employees to us and is reimbursed for all related costs incurred on our behalf. Pursuant to the Agreement, the Partnership engaged the GP to continue providing administrative, engineering, operating and other services to the Partnership. Administrative services include without limitation legal, accounting, treasury, insurance administration and claims processing, risk management, health, safety and environmental, information technology, human resources, credit, payroll, internal audit and tax. The Partnership will pay the GP a fixed annual fee of $500,000 for certain administrative services, and reimburse the GP at cost for other expenses and expenditures. The term of the Services Agreement expires on December 31, 2015, and automatically renews for successive one year periods unless terminated. Pursuant to the Services Agreement, the primary reimbursements to our GP, during the three months ended March 31, 2015, were for costs related to payroll. Reimbursable costs under the Services Agreement totaling $0.9 million and $0.6 million were included in accounts payable as of March 31, 2015 and December 31, 2014, respectively.
	Additionally, in December 2014 we entered into a coal mining lease, with a subsidiary of WCC, to mine fee simple interest coal reserves we control at WCC’s Kemmerer Mine in Lincoln County, Wyoming. Under this lease, we earn a per ton royalty as these coal reserves are mined. For the three months ended March 31, 2015, we recognized $1.8 million in coal royalty revenue, which was included in Receivables - trade at March 31, 2015.
	Finally, we sold coal to and performed various transportation and operational services for a subsidiary of WCC, which generated $12.2 million in coal revenues and $2.4 million in non-coal revenues for the three months ended March 31, 2015. As of March 31, 2015 revenues totaling $6.5 million were included Receivables - trade.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION
	We operate in one business segment. We operated surface coal mines in the Illinois Basis through December 2013, and we operate surface coal mines in Northern Appalachia and sell high-value thermal coal to utilities, industrial customers, municipalities and other coal-related entities primarily in the eastern United States. Our operating and executive management makes its decisions based on consolidated reports. Three of our operating subsidiaries extract coal utilizing surface-mining techniques and prepare it for sale to their customers. Such operating subsidiaries share customers and a particular customer may receive coal from any one of such operating subsidiaries. We also lease or sublease coal reserves to others through Oxford Mining and Westmoreland Kemmerer Fee Coal Holdings, LLC ("WKFCH") in exchange for a per ton royalty rate.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS
	Westmoreland Resources GP, LLC, general partner of WMLP, declared a cash distribution for all of our unitholders and warrant unitholders of $0.20 per unit for its first quarter ended March 31, 2015.  The distribution will be paid on May 15, 2015 to all unitholders and warrant unitholders of record as of the close of business on May 8, 2015.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements
	In April 2014, the FASB issued ASU 2014-8, Presentation of Financial Statements and Property, Plant and Equipment, which changes the presentation of discontinued operations on the statements of operations and other requirements for reporting discontinued operations. Under the new standard, a disposal of a component or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results when the component meets the criteria to be classified as held for sale or is disposed. The amendments in this update also require additional disclosures about discontinued operations and disposal of an individually significant component of an entity that does not qualify for discontinued operations. The new guidance is effective for interim and annual periods beginning after December 15, 2014. We adopted ASU 2014-8 effective January 1, 2015.
	In August 2014, the FASB issued ASU 2014-17, Pushdown Accounting, which allows entities the option to elect pushdown of purchase accounting each time there is a change-in-control event in which an acquirer obtains control of an acquiree. If an acquiree does not initially elect to apply pushdown accounting upon a change-in-control event, it can subsequently elect to apply pushdown accounting to its most recent change-in-control event in a later reporting period as a change in accounting principle. Once made, the election to apply pushdown accounting is irrevocable. Entities applying pushdown accounting are required to measure the individual assets and liabilities of the acquired entity based on the measurement guidance in ASC 805, including the recognition of goodwill. However, any bargain purchase gain recognized by the acquirer should not be recognized in the acquiree’s income statement, but rather as an adjustment to additional paid-in capital. Acquisition-related debt is recognized by the acquiree only if the acquired entity is required to recognize a liability for debt in accordance with other applicable guidance. See our application of ASU 2014-17 in Note 2.
	In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, which requires that debt issuance costs related to a recognized liability, be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The new guidance should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. These disclosures include the nature of and reason for the change in accounting principle, the transition method, a description of the prior-period information that has been retrospectively adjusted, and the effect of the change on the financial statement line items (i.e., debt issuance cost asset and the debt liability). The new guidance is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years, with early adoption permitted for financial statements that have not been previous issued. Management projects the impact to the financial statements resulting in balance sheet reclassification for which the Deferred financing costs, net account is recharacterized as a a contra-liability reducing the Long-term debt, less current installments balance for each of the respective periods upon adoption.
	In May 2014, the FASB issued ASU 2014-9, Revenue From Contracts With Customers, which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The ASU is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration which the entity expects to be entitled to receive in exchange for those goods or services. The ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract. Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard. In April 2015, the FASB agreed to propose a one-year deferral of the revenue recognition standard's effective date. The new guidance is now effective for the interim and annual periods beginning after December 15, 2017; early application is permitted, but not before the original effective date (annual reporting periods beginning after December 15, 2016). We are currently assessing the impact that this standard will have on our consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which is intended to define management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related footnote disclosures. Under GAAP, financial statements are prepared based on the presumption that the reporting organization will continue to operate as a going concern, except in limited circumstances. Financial reporting under this presumption is commonly referred to as the going concern basis of accounting. The going concern basis of accounting is critical to financial reporting because it establishes the fundamental basis for measuring and classifying assets and liabilities. Currently, GAAP lacks guidance about management’s responsibility to evaluate whether there is substantial doubt about the organization’s ability to continue as a going concern or to provide related footnote disclosures. This ASU provides guidance to an organization’s management, with principles and definitions that are intended to reduce diversity in the timing and content of disclosures that are commonly provided by organizations today in the financial statement footnotes. The new guidance is effective for the interim and annual periods beginning after December 15, 2016; early adoption is permitted for annual or interim reporting periods for which the financial statements have not previously been issued.
Reclassifications	Reclassifications
	Certain prior-year amounts have been reclassified in our condensed statements of operations and statements of cash flows for the three months ended March 31, 2014 to conform with the financial statement line items used by our GP's parent, WCC.

Acquisition_and_Pushdown_Accou1

Acquisition and Pushdown Accounting (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	A summary of the estimated purchase consideration and a preliminary allocation of the estimated purchase consideration is as follows (in millions):
	Estimated purchase consideration
	Market value of limited partners' units	$	10.8
	Cash paid	33.5
	Total consideration	$	44.3
	Estimated fair value of liabilities assumed:
	Debt	$	160.1
	Asset retirement obligations	31.7
	Other liabilities	0.2
	Warrants	2
	Total estimated fair value of liabilities assumed	194
	Total estimated purchase consideration:	$	238.3
	Preliminary allocation of estimated purchase consideration:
	Working capital	$	14.7
	Land and mineral rights	38.6
	Plant and equipment	134
	Advanced coal royalities	9.2
	Restricted investments and bond collateral	10.6
	Intangible asset	31
	Other assets	0.2
	Total preliminary allocation of estimated purchase consideration:	$	238.3

Inventory_Tables

Inventory (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventory consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,		December 31,
		2015		2014
	Coal	$	5,206	$	6,590
	Fuel inventory	1,545		1,860
	Materials and supplies	5,945		5,563
	Total	$	12,696	$	14,013

Restructuring_Charges_Tables

Restructuring Charges (Tables)	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges	WCC Transactions restructuring accrual activity is summarized as follows:
		Westmoreland Resource Partners, LP
		(Successor)
		As of December 31, 2014		Three Months Ended March 31, 2015					As of March 31, 2015
		Liability		Charges		Payments			Liability
	Severance and other termination costs	$	2,783	$	553	$	(2,943	)	$	393
	The following table summarizes the total WCC Transactions restructuring charges incurred over the course of the restructuring:
		Westmoreland Resource Partners, LP
		(Successor)
		Charges
		For the Three Months Ended March 31, 2015		Incurred Through March 31,		Total Expected
				2015		Restructuring Expenses
	Severance and other termination costs	$	553	$	3,336	$	3,436

Other_Current_Assets_Tables

Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,		December 31,
		2015		2014
	Prepaid Insurance	$	1,829	$	418
	Other	808		899
	Total	$	2,637	$	1,317

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure Text Block [Abstract]
Schedule of Long-Term Debt Instruments	Debt consisted of the following:
		Westmoreland Resource Partners, LP
		(Successor)
		March 31,			December 31,
		2015			2014
	First lien debt:
	Term loan	$	175,000		$	175,000
	Paid-in-kind interest	1,327			—
	Total first lien debt	176,327			175,000
	Notes payable	33			35
	Total debt	176,360			175,035
	Less current portion	(6		)	(6		)
	Long-term debt	$	176,354		$	175,029

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2015
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligations	Changes in the Partnership's asset retirement obligations were as follows:
		Westmoreland Resource Partners, LP			Oxford Resource Partners, LP
		(Successor)			(Predecessor)
		Three Months Ended			Three Months Ended
		March 31, 2015			March 31, 2014
	Asset retirement obligations, January 1,	$	31,685		$	31,654
	Accretion	804			565
	Changes resulting from additional mines	442			—
	Changes due to amount and timing of reclamation	596			(188		)
	Payments	(958		)	(615		)
	Asset retirement obligations, March 31,	32,569			31,416
	Less current portion	(9,855		)	(7,420		)
	Asset retirement obligations, less current portion	$	22,714		$	23,996

UnitBased_Compensation_Tables

Unit-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Recognized Compensation Expense	We recognized compensation expense from unit-based arrangements shown in the following table:
		Westmoreland Resource Partners, LP				Oxford Resource Partners, LP
		(Successor)				(Predecessor)
		Three Months Ended				Three Months Ended
		March 31, 2015				March 31, 2014
	Recognition of fair value of restricted common units over the vesting period	$	21			$	456
Summary of Restricted Common Unit Award Activity	A summary of restricted common unit award activity for the three months ended March 31, 2015 is as follows:
		Westmoreland Resource Partners, LP
		(Successor)
		Units		Weighted Average Grant-Date Fair Value				Unamortized Compensation Expense
								(in thousands)
	Non-vested at December 31, 2014	—		$	—
	Granted	21,930		11.4
	Vested	—		—
	Non-vested at March 31, 2015	21,930		$	11.4			$	229	1
	1Expected to be recognized over the next 11 months.

Earnings_Losses_Per_Unit_Table

Earnings (Losses) Per Unit (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The computation of basic and diluted earnings (losses) per unit under the two class method for limited partner units and general partner units is presented as follows:
		Westmoreland Resource Partners, LP			Oxford Resource Partners, LP
		(Successor)			(Predecessor)
		Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	Limited partner units
	Average units outstanding basic and diluted1, 2	5,878,187			2,055,033
	Net loss allocated to limited partners basic and diluted2	$	(10,244	)	$	(10,014	)
	Net loss per limited partner unit basic and diluted2	$	(1.74	)	$	(4.92	)
	General partner units
	Average units outstanding basic and diluted	35,291			35,291
	Net loss allocated to general partners basic and diluted2	$	(61	)	$	(172	)
	Net loss per general partner unit basic and diluted	$	(1.74	)	$	(4.92	)
	1Unvested LTIP units are not dilutive units for the years and periods presented herein, but could be in the future. Anti-dilutive units are not used in calculating diluted average units.
	2Reflects the impact of the outstanding common unit warrants for the three months ended March 31, 2015 and 2014, respectively..

Basis_of_Presentation_Narrativ

Basis of Presentation - Narrative (Details)	1 Months Ended	3 Months Ended	0 Months Ended
	Jan. 31, 2015	Mar. 31, 2015	Apr. 23, 2015
		period
Subsequent Event [Line Items]
Number of reporting periods		2
Common unit distributions (units)	206,543
Unit dividend (percentage)	25.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Ownership interest			79.00%

Acquisition_and_Pushdown_Accou2

Acquisition and Pushdown Accounting - Narrative (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash paid	$33.50
Total estimated purchase consideration	238.3
Total estimated fair value of liabilities assumed	$194	$194
Successor [Member] | Capital Units [Member]
Business Acquisition [Line Items]
Percent of equity owned	100.00%	100.00%
Successor [Member] | Subordinated [Member]
Business Acquisition [Line Items]
Percent of equity owned	100.00%	100.00%
Successor [Member] | Warrant [Member]
Business Acquisition [Line Items]
Percent of equity owned	100.00%	100.00%

Acquisition_and_Pushdown_Accou3

Acquisition and Pushdown Accounting - Summary of Estimated Purchase Consideration (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014
Business Combination, Consideration Transferred [Abstract]
Market value of limited partners' units	$10.80
Cash paid	33.5
Total consideration	44.3
Estimated fair value of liabilities assumed:
Debt		160.1
Asset retirement obligations		31.7
Other liabilities		0.2
Warrants		2
Total estimated fair value of liabilities assumed		194
Total estimated purchase consideration:	238.3
Preliminary allocation of estimated purchase consideration:
Working capital		14.7
Land and mineral rights		38.6
Plant and equipment		134
Advanced coal royalities		9.2
Restricted investments and bond collateral		10.6
Intangible asset		31
Other assets		0.2
Total preliminary allocation of estimated purchase consideration:		$238.30

Inventory_Details

Inventory (Details) (Successor [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Successor [Member]
Coal	$5,206	$6,590
Fuel inventory	1,545	1,860
Materials and supplies	5,945	5,563
Total	$12,696	$14,013

Restructuring_Charges_Accrual_

Restructuring Charges - Accrual Activity (Details) (Successor [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring costs	$100,000
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Liability	2,783,000
Charges	553,000
Payments	-2,943,000
Liability	$393,000

Restructuring_Charges_Schedule

Restructuring Charges - Schedule of Charges Incurred (Details) (Successor [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$553
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	553
Restructuring and Related Cost, Cost Incurred to Date	3,336
Restructuring and Related Cost, Expected Cost	$3,436

Other_Current_Assets_Details

Other Current Assets (Details) (Successor [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Successor [Member]
Other Current Assets [Line Items]
Prepaid Insurance	$1,829	$418
Other	808	899
Other current assets	$2,637	$1,317

LongTerm_Debt_Schedule_Details

Long-Term Debt - Schedule (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Agreement 2014 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Paid-in-kind interest	$1,327
Total first lien debt		175,000
Successor [Member]
Debt Instrument [Line Items]
Long-term Debt	176,360	175,035
Notes payable	33	35
Less current portion	-6	-6
Long-term debt, less current installments	176,354	175,029
Successor [Member] | First Lien Financing Agreement [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	175,000	175,000
Successor [Member] | Financing Agreement 2014 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Paid-in-kind interest	1,327	0
Total first lien debt	$176,327	$175,000

LongTerm_Debt_Credit_Facilitie

Long-Term Debt - Credit Facilities (Details) (Financing Agreement 2014 [Member], Secured Debt [Member], USD $)	3 Months Ended	0 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2014
Line of Credit Facility [Line Items]
Amount of term loan		175,000,000	$175,000,000
Amount of unused borrowing capacity		120,000,000	120,000,000
Fixed portion of the effective rate (percentage)	8.50%
Interest rate, effective percentage	9.25%
Paid-in-kind interest	1,327,000
Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate, paid-in-kind		1.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate, paid-in-kind		3.00%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
Successor [Member]
Line of Credit Facility [Line Items]
Amount of term loan	176,327,000	175,000,000	175,000,000
Paid-in-kind interest	$1,327,000		$0

LongTerm_Debt_Deferred_Financi

Long-Term Debt - Deferred Financing Costs (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Successor [Member]
Debt Instrument [Line Items]
Amortization of deferred financing costs	$405
Predecessor [Member]
Debt Instrument [Line Items]
Amortization of deferred financing costs		$946

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Details) (Warrant [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Warrant [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value of each warrant	$11.72
Fair value assumption, spot price per unit	11.84
Fair value assumption, exercise price per unit	$0.12
Fair value assumption, expected term	3 years 3 months
Fair value assumption, expected volatility rate	83.00%
Fair value assumption, three-year treasury rate	0.90%

Asset_Retirement_Obligations_N

Asset Retirement Obligations - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Estimated Final Reclamationand Mine Closure Cost [Member]
Asset Retirement Obligations [Line Items]
Undiscounted Aggregate Mine Closure	$42,500,000
Successor [Member]
Asset Retirement Obligations [Line Items]
Asset retirement obligations	$32,569,000	$31,685,000

Asset_Retirement_Obligations_S

Asset Retirement Obligations - Schedule of Activities (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Successor [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning period	$31,685
Accretion of asset retirement obligations	804
Changes resulting from additional mines	442
Changes due to amount and timing of reclamation	596
Payments	-958
Asset retirement obligation, ending period	32,569
Less current portion	-9,855		-7,783
Asset retirement obligations, less current portion	22,714
Predecessor [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning period		31,654
Accretion of asset retirement obligations		565
Changes resulting from additional mines		0
Changes due to amount and timing of reclamation		-188
Payments		-615
Asset retirement obligation, ending period		31,416
Less current portion		-7,420
Asset retirement obligations, less current portion		$23,996

UnitBased_Compensation_Schedul

Unit-Based Compensation - Schedule of Compensation Expense (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Successor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognition of fair value of restricted common units over the vesting period	$21
Predecessor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognition of fair value of restricted common units over the vesting period		$456

UnitBased_Compensation_Summary

Unit-Based Compensation - Summary of Restricted Common Units (Details) (Successor [Member], Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015
Successor [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	11 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested at the beginning of the period (units)	0
Granted (units)	21,930
Vested (units)	0
Non-vested at the end of the period (units)	21,930
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested at the beginning of the period	$0
Granted	$11.40
Vested	$0
Non-vested at the end of the period	$11.40
Unamortized Compensation Expense	$229

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Loss Contingencies [Line Items]
Surety bonds outstanding	32.1
Collateral amount	8
Road bonds, total	0.5
Performance bonds outstanding	2.9
Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	0.6
Loss contingency, accrual, current	0.1
Minimum [Member]
Loss Contingencies [Line Items]
Remaining terms of long-term contract	1 year
Maximum [Member]
Loss Contingencies [Line Items]
Remaining terms of long-term contract	3 years

Earnings_Losses_Per_Unit_Detai

Earnings (Losses) Per Unit (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Successor [Member]
Limited partner units
Average units outstanding basic and diluted	5,878,187
Net loss allocated to limited partners basic and diluted	($10,244)
Net loss per limited partner unit basic and diluted	($1.74)
General partner units
Average units outstanding basic and diluted	35,291
Net loss allocated to general partners basic and diluted	-61
Net loss per general partner unit basic and diluted	($1.74)
Predecessor [Member]
Limited partner units
Average units outstanding basic and diluted		2,055,033
Net loss allocated to limited partners basic and diluted		-10,014
Net loss per limited partner unit basic and diluted		($4.92)
General partner units
Average units outstanding basic and diluted		35,291
Net loss allocated to general partners basic and diluted		($172)
Net loss per general partner unit basic and diluted		($4.92)

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	1 Months Ended	3 Months Ended
	Aug. 31, 2007	Mar. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Notice period for terminating service agreement	30 days
Fixed annual fee for administrative services		$500,000
Automatic Renewal of Service Agreement, Renewal Term		1 year
Accounts payable, related parties, current		900,000	600,000
Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current		6,500,000
Royalty Revenue from Coal [Member] | Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		1,800,000
Coal Revenue [Member] | Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		12,200,000
Non-Coal Revenue [Member] | Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		$2,400,000

Segment_Information_Details

Segment Information (Details)	3 Months Ended
	Mar. 31, 2015
	subsidiary
	business_segment
Segment Reporting [Abstract]
Number of Operating Segments	1
Number of Operating Subsidiaries	3

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Cash distribution declared (per unit)	$0.20