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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Actuarial gain (loss), tax $ 3,703 $ 3,235 $ (28,782)
Amortization of actuarial (gain) loss, tax 957 1,880 (8)
Effects of settlements, tax $ 1,598 $ 193 $ 0