Impairment Charges and Mine Closure Costs (Tables)

12 Months Ended

Dec. 31, 2016

Impairment Charges and Mine Closure Costs [Abstract]

Restructuring and Related Costs

The following table summarizes the amounts reflected on the line “Asset impairment and mine closure costs” in the consolidated statements of operations:

	Successor		Predecessor
Description	October 2 Through December 31, 2016		January 1 Through October 1, 2016		Year Ended December 31, 2015			Year Ended December 31, 2014
			(In thousands)
Coal lands and mineral rights	$	—	$	74,144	$	2,210,488		$	—
Plant and equipment	—		—		199,107			1,512
Deferred development	—		—		159,474			—
Prepaid royalties	—		3,406		41,990			15,356
Equity investments	—		40,920		21,325			—
Inventories	—		—		66			—
Other	—		10,797		(4,147		)	7,245
Total	$	—	$	129,267	$	2,628,303		$	24,113