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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Actuarial gain, tax $ 0 $ 0 $ 7,422 $ 0
Amortization of actuarial (gain) loss, tax 379 (2) 1,496 (6)
Effect of settlements, tax $ 0 $ 0 $ 192 $ 0