Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Successor
Revenues	$ 613,538		$ 1,764,379
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)	495,424		1,391,872
Depreciation, depletion and amortization	31,914		94,536
Accretion on asset retirement obligations	7,580		22,826
Amortization of sales contracts, net	13,861		42,903
Change in fair value of coal derivatives and coal trading activities, net	1,028		2,745
Asset impairment and mine closure costs	0		0
Selling, general and administrative expenses	21,052		63,721
Gain on sale of Lone Mountain Processing, Inc.	(21,574)		(21,574)
Other operating income, net	(8,236)		(14,095)
Total operating expenses	541,049		1,582,934
Income (loss) from operations	72,489		181,445
Interest expense, net
Interest expense	(5,972)		(21,400)
Interest and investment income	720		2,089
Interest expense, net	(5,252)		(19,311)
Income (loss) before nonoperating expenses	67,237		162,134
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring	(486)		(2,547)
Reorganization items, net	(43)		(2,892)
Nonoperating income (expense)	(529)		(5,439)
Income (loss) before income taxes	66,708		156,695
Benefit from income taxes	(1,643)		(484)
Net income (loss)	$ 68,351		$ 157,179
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)	$ 2.90		$ 6.44
Diluted earnings (loss) per common share (in dollars per share)	$ 2.83		$ 6.32
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)	23,580		24,416
Diluted weighted average shares outstanding (shares)	24,135		24,875
Dividends declared per common share (in dollars per share)	$ 0.35		$ 0.7
Predecessor
Revenues		$ 550,305		$ 1,398,709
Costs, expenses and other operating
Cost of sales (exclusive of items shown separately below)		442,462		1,264,464
Depreciation, depletion and amortization		69,423		191,581
Accretion on asset retirement obligations		7,965		24,321
Amortization of sales contracts, net		104		(728)
Change in fair value of coal derivatives and coal trading activities, net		488		2,856
Asset impairment and mine closure costs		46		129,267
Selling, general and administrative expenses		20,498		59,343
Gain on sale of Lone Mountain Processing, Inc.		0		0
Other operating income, net		(2,476)		(15,257)
Total operating expenses		538,510		1,655,847
Income (loss) from operations		11,795		(257,138)
Interest expense, net
Interest expense		(46,164)		(135,888)
Interest and investment income		582		2,653
Interest expense, net		(45,582)		(133,235)
Income (loss) before nonoperating expenses		(33,787)		(390,373)
Nonoperating expenses
Net loss resulting from early retirement of debt and debt restructuring		0		(2,213)
Reorganization items, net		(20,904)		(46,050)
Nonoperating income (expense)		(20,904)		(48,263)
Income (loss) before income taxes		(54,691)		(438,636)
Benefit from income taxes		(3,270)		(4,626)
Net income (loss)		$ (51,421)		$ (434,010)
Net income (loss) per common share
Basic earnings (loss) per common share (in dollars per share)		$ (2.41)		$ (20.38)
Diluted earnings (loss) per common share (in dollars per share)		$ (2.41)		$ (20.38)
Weighted average shares outstanding
Basic weighted average shares outstanding (shares)		21,293		21,293
Diluted weighted average shares outstanding (shares)		21,293		21,293
Dividends declared per common share (in dollars per share)		$ 0		$ 0