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Consolidated Statements of Comprehensive Income (Unaudited) Parenthetical - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Actuarial gain, tax effect $ 0 $ 3,383 $ 0 $ 3,383
Amortization of actuarial (gain) loss, tax (11) 90 (22) 298
Effect of settlements, tax effect $ 0 $ 3,044 $ 0 $ 3,044