CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
NET INCOME		$ 60,943	$ 88,844	$ 228,377	$ 217,365
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME		341	127	846	383
COMPREHENSIVE INCOME		61,284	88,971	229,223	217,748
Less: Comprehensive income attributable to noncontrolling interests		(21,957)	(40,410)	(92,039)	(92,827)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP		39,327	48,561	137,184	124,921
Pension Plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost (1)	[1]	46		140
Amortization of actuarial (gain) loss (1)	[1]	774	787	2,319	2,365
Total recognized adjustments		820	787	2,459	2,365
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of actuarial (gain) loss (1)	[1]	(479)	(660)	(1,613)	(1,982)
Total recognized adjustments		$ (479)	$ (660)	$ (1,613)	$ (1,982)

[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).