Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Operating Segment Results

	PRB		MET		Other Thermal		Corporate, Other and Eliminations			Consolidated
	(in thousands)
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
Three Months Ended June 30, 2017
Revenues	$	230,579	$	227,649	$	91,639	$	(1	)	$	549,866
Adjusted EBITDA	31,789		62,552		26,910		(25,651		)	95,600
Depreciation, depletion and amortization	8,574		18,385		3,285		457			30,701
Accretion on asset retirement obligation	5,040		528		540		1,515			7,623
Total assets	426,793		580,543		126,870		997,852			2,132,058
Capital expenditures	822		6,825		1,899		1,426			10,972
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
Six Months Ended June 30, 2017
Revenues	$	504,007	$	453,232	$	193,545	$	57		$	1,150,841
Adjusted EBITDA	79,794		130,862		54,152		(47,989		)	216,819
Depreciation, depletion and amortization	18,085		37,149		6,485		903			62,622
Accretion on asset retirement obligation	10,080		1,057		1,080		3,029			15,246
Total assets	426,793		580,543		126,870		997,852			2,132,058
Capital expenditures	950		11,436		2,640		1,896			16,922

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,
	2018			2017		2018			2017
	(In thousands)
Net income	$	43,306		$	37,160	$	103,291		$	88,828
Provision for (benefit from) income taxes	$	(3,366	)	$	319	$	(3,910	)	$	1,159
Interest expense, net	3,498			5,161		7,620			14,059
Depreciation, depletion and amortization	30,549			30,701		60,252			62,622
Accretion on asset retirement obligations	6,993			7,623		13,985			15,246
Amortization of sales contracts, net	3,248			14,352		6,299			29,042
Net loss resulting from early retirement of debt and debt restructuring	485			31		485			2,061
Non-service related pension and postretirement benefit costs	(68		)	232		1,235			953
Reorganization items, net	740			21		1,041			2,849
Adjusted EBITDA	$	85,385		$	95,600	$	190,298		$	216,819