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Consolidated Statements of Comprehensive Income Parenthetical - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Actuarial gain, tax $ 7,422 $ 0 $ 7,422 $ 0
Amortization of actuarial (gain) loss, tax 504 (2) 1,117 (4)
Effect of settlements, tax $ 0 $ 0 $ 192 $ 0