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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]                      
Net Income $ 2,300 $ 22,000 $ 20,200 $ 7,600 $ 15,700 $ 32,300 $ 26,400 $ 5,600 $ 52,182 $ 80,009 $ 116,936
Defined benefit pension plans                      
Actuarial gain (loss), net of tax of $3,235, ($28,782), and $37,071, respectively                 5,171 (46,234) 60,100
Amortization of actuarial (gain) loss, net of tax of $1,880, ($8), and $3,510, respectively                 3,004 (15) 5,692
Effects of settlements, net of tax of $193, $0, and $0, respectively                 308 0 0
Amortization of prior service costs and other, net of tax of $0, $0, and $116, respectively                 0 0 188
Other comprehensive income (loss), net of tax                 8,483 (46,249) 65,980
Comprehensive income                 $ 60,665 $ 33,760 $ 182,916