Impairment Charges and Mine Closure Costs (Tables)

12 Months Ended

Dec. 31, 2017

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	Year Ended December 31, 2017		October 2 through December 31, 2016		January 1 through October 1, 2016		Year Ended December 31, 2015
(In thousands)
Coal lands and mineral rights	$	—	$	—	$	74,144	$	2,210,488
Plant and equipment	—		—		—		199,107
Deferred development	—		—		—		159,474
Prepaid royalties	—		—		3,406		41,990
Equity investments	—		—		40,920		21,325
Inventories	—		—		—		66
Other	—		—		10,797		(4,147		)
Total	$	—	$	—	$	129,267	$	2,628,303