CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
NET INCOME		$ 62,872	$ 81,632	$ 167,434	$ 128,521
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME		252	128	505	256
COMPREHENSIVE INCOME		63,124	81,760	167,939	128,777
Less: Comprehensive income attributable to noncontrolling interests		(20,433)	(36,332)	(70,082)	(52,417)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP		42,691	45,428	97,857	76,360
Pension Plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost (1)	[1]	47		94
Amortization of actuarial (gain) loss (1)	[1]	772	789	1,545	1,578
Total recognized adjustments		819	789	1,639	1,578
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of actuarial (gain) loss (1)	[1]	(567)	(661)	(1,134)	(1,322)
Total recognized adjustments		$ (567)	$ (661)	$ (1,134)	$ (1,322)

[1] Amortization of prior service cost and net actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 10 and 12 for additional details).