Segment Information (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of Operating Segment Results

	PRB		MET		Other Thermal		Corporate, Other and Eliminations			Consolidated
	(in thousands)
Three Months Ended June 30, 2019
Revenues	$	210,149	$	261,245	$	98,205	$	623		$	570,222
Adjusted EBITDA	14,696		101,936		10,922		(21,990		)	105,564
Depreciation, depletion and amortization	4,880		17,343		3,689		612			26,524
Accretion on asset retirement obligation	3,135		531		603		868			5,137
Total assets	236,527		605,657		136,899		910,447			1,889,530
Capital expenditures	13,209		31,150		3,211		1,138			48,708
Three Months Ended June 30, 2018
Revenues	$	229,878	$	259,032	$	99,814	$	3,625		$	592,349
Adjusted EBITDA	26,491		86,657		11,842		(39,605		)	85,385
Depreciation, depletion and amortization	8,304		18,018		3,701		526			30,549
Accretion on asset retirement obligation	4,885		469		565		1,074			6,993
Total assets	379,613		551,012		134,319		884,469			1,949,413
Capital expenditures	3,065		11,899		2,559		3,073			20,596
Six Months Ended June 30, 2019
Revenues	$	422,878	$	514,507	$	184,183	$	3,837		$	1,125,405
Adjusted EBITDA	35,279		193,470		17,041		(32,972		)	212,818
Depreciation, depletion and amortization	9,745		33,725		7,124		1,203			51,797
Accretion on asset retirement obligation	6,271		1,061		1,207		1,735			10,274
Total assets	236,527		605,657		136,899		910,447			1,889,530
Capital expenditures	13,623		62,374		9,461		2,396			87,854
Six Months Ended June 30, 2018
Revenues	$	475,306	$	497,379	$	191,334	$	3,625		$	1,167,644
Adjusted EBITDA	53,993		170,399		27,510		(61,604		)	190,298
Depreciation, depletion and amortization	16,727		35,003		7,536		986			60,252
Accretion on asset retirement obligation	9,771		937		1,130		2,147			13,985
Total assets	379,613		551,012		134,319		884,469			1,949,413
Capital expenditures	3,763		17,728		3,765		4,793			30,049

Reconciliation Statement of Segment Income from Operations to Consolidated Income Before Income Taxes

A reconciliation of net income to adjusted EBITDA follows:

	Three Months Ended June 30,					Six Months Ended June 30,
	2019		2018			2019			2018
	(In thousands)
Net income	$	62,840	$	43,306		$	135,581		$	103,291
Provision for (benefit from) income taxes	91		(3,366		)	161			(3,910		)
Interest expense, net	2,287		3,498			4,576			7,620
Depreciation, depletion and amortization	26,524		30,549			51,797			60,252
Accretion on asset retirement obligations	5,137		6,993			10,274			13,985
Amortization of sales contracts, net	11		3,248			76			6,299
Loss on sale of Lone Mountain Processing, LLC	4,304		—			4,304			—
Net loss resulting from early retirement of debt and debt restructuring	—		485			—			485
Non-service related pension and postretirement benefit costs	1,336		(68		)	3,102			1,235
Reorganization items, net	16		740			(71		)	1,041
Costs associated with proposed joint venture with Peabody Energy	3,018		—			3,018			—
Adjusted EBITDA	$	105,564	$	85,385		$	212,818		$	190,298