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Consolidated Statements of Comprehensive Income (Unaudited) (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]        
Amortization of prior service cost, tax $ (43) $ 0 $ (133) $ 0
Amortization of net loss including settlement charges, tax 0 256 1,168 1,561
Current period change in fair value of pension and postretirement plans, tax $ 0 $ 0 $ (6) $ 0