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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Actuarial gain, tax $ 0 $ 0 $ 0 $ 7,422
Amortization of actuarial loss, tax 225 379 593 1,496
Effect of settlements, tax $ 0 $ 0 $ 114 $ 192