CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
NET INCOME		$ 104,562	$ 46,889
OTHER COMPREHENSIVE INCOME (LOSS):
OTHER COMPREHENSIVE INCOME		253	128
COMPREHENSIVE INCOME		104,815	47,017
Less: Comprehensive income attributable to noncontrolling interests		(49,649)	(16,085)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP		55,166	30,932
Pension Plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost (1)	[1]	47
Amortization of actuarial (gain) loss (1)	[1]	773	789
Total recognized adjustments		820	789
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of actuarial (gain) loss (1)	[1]	(567)	(661)
Total recognized adjustments		$ (567)	$ (661)

[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).