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Consolidated Statements of Comprehensive Income - 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]        
Net income $ 9,981 $ 22,007 $ 34,159 $ 49,854
Defined benefit pension plans        
Actuarial gain, net of tax of $-, $-, $-, and $7,422, respectively 0 0 0 11,923
Amortization of actuarial loss, net of tax of $225, $379, $593, and $1,496 respectively 359 608 947 2,401
Effect of settlements, net of tax of $-, $-, $114, and $192, respectively 0 0 183 309
Other comprehensive income, net of tax 359 608 1,130 14,633
Comprehensive income $ 10,340 $ 22,615 $ 35,289 $ 64,487