Impairment Charges and Mine Closure Costs (Tables)

12 Months Ended

Dec. 31, 2015

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:

	Year Ended December 31,
Description	2015			2014		2013
	(In thousands)
Coal lands and mineral rights	$	2,210,488		$	—	$	79,094
Plant and equipment	199,107			1,512		36,296
Deferred development	159,474			—		13,451
Prepaid royalties	41,990			15,356		1,104
Equity investments	21,325			—		28,947
Notes receivable	—			—		49,203
Inventories	66			—		12,765
Other	(4,147		)	7,245		19
Total	$	2,628,303		$	24,113	$	220,879