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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Actuarial gain (loss), tax $ 3,235 $ (28,782) $ 37,071
Amortization of actuarial (gain) loss, tax 1,880 (8) 3,510
Effects of settlements, tax 193 0 0
Amortization of prior service costs and other, tax $ 0 $ 0 $ 116