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Consolidated Statements of Comprehensive Income (Unaudited) Parenthetical - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Actuarial gain (loss), tax effect $ 0 $ (983) $ 0 $ 2,400
Amortization of actuarial (gain) loss, tax (12) 39 (34) 337
Effect of settlements, tax effect $ 341 $ 2,853 $ 341 $ 5,897