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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NET INCOME $ 302,258 $ 336,553 $ 304,158
OTHER COMPREHENSIVE INCOME (LOSS):      
Total recognized adjustments (13,400) (3,983) 1,290
OTHER COMPREHENSIVE INCOME (13,400) (3,983) 1,290
COMPREHENSIVE INCOME 288,858 332,570 305,448
Less: Comprehensive income attributable to noncontrolling interests (111,952) (148,311) (93,555)
COMPREHENSIVE INCOME ATTRIBUTABLE TO AHGP 176,906 184,259 211,893
Pension Plan      
OTHER COMPREHENSIVE INCOME (LOSS):      
Prior service cost   (1,498)  
Amortization of prior service cost (1) [1] 186    
Net actuarial loss (6,610) (2,589) (863)
Amortization of actuarial (gain) loss (1) [1] 3,054 2,952 3,354
Total recognized adjustments (3,370) (1,135) 2,491
Pneumoconiosis benefits      
OTHER COMPREHENSIVE INCOME (LOSS):      
Net actuarial loss (7,938) (205) (750)
Amortization of actuarial (gain) loss (1) [1] (2,092) (2,643) (451)
Total recognized adjustments $ (10,030) $ (2,848) $ (1,201)
[1] Amortization of prior service cost and actuarial gain or loss is included in the computation of net periodic benefit cost (see Notes 13 and 17 for additional details).