CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
NET INCOME		$ 336,553	$ 304,158	$ 492,669
OTHER COMPREHENSIVE INCOME (LOSS):
Total recognized adjustments		(3,983)	1,290	(26,128)
OTHER COMPREHENSIVE (LOSS) INCOME		(3,983)	1,290	(26,128)
COMPREHENSIVE INCOME		332,570	305,448	466,541
Less: Comprehensive income attributable to noncontrolling interests		(148,311)	(93,555)	(193,448)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP		184,259	211,893	273,093
Pension Plan
OTHER COMPREHENSIVE INCOME (LOSS):
Prior service credit		(1,498)
Net actuarial loss		(2,589)	(863)	(23,821)
Amortization of actuarial (gain) loss	[1]	2,952	3,354	773
Total recognized adjustments		(1,135)	2,491	(23,048)
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Net actuarial loss		(205)	(750)	(2,029)
Amortization of actuarial (gain) loss	[1]	(2,643)	(451)	(1,051)
Total recognized adjustments		$ (2,848)	$ (1,201)	$ (3,080)

[1] Amortization of actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 13 and 17 for additional details).