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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Amortization of actuarial loss, tax $ 170 $ 225 $ 479 $ 593
Effect of settlements, tax $ 0 $ 0 $ 0 $ 114