Other Accrued Liabilities

12 Months Ended

Dec. 31, 2017

Other Liabilities Disclosure [Abstract]

Other Accrued Liabilities

OTHER ACCRUED LIABILITIES:

	December 31,
	2017		2016
Subsidence liability	$	88,027	$	104,437
Longwall equipment buyout	22,631		—
Accrued payroll and benefits	14,689		17,326
Accrued interest	10,039		2,239
Equipment lease rental	9,865		15,286
Litigation	8,197		12,532
Accrued other taxes	7,510		12,732
Deferred revenue	6,807		10,520
Short-term incentive compensation	4,729		6,073
Other	23,900		19,747
Current portion of long-term liabilities:
Postretirement benefits other than pensions	37,464		40,611
Asset retirement obligations	30,480		26,259
Workers' compensation	13,317		13,596
Pneumoconiosis benefits	12,972		10,763
Total Other Accrued Liabilities	$	290,627	$	292,121