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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Amortization of actuarial loss, tax $ 158 $ 184 $ 310 $ 368
Effect of settlements, tax $ 0 $ 0 $ 0 $ 114