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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net Income $ 38,254 $ 52,182 $ 80,009
Defined benefit pension plans      
Actuarial gain (loss), net of tax of $3,703, $3,235, and ($28,782), respectively 5,919 5,171 (46,234)
Amortization of actuarial (gain) loss, net of tax of $957, $1,880, and ($8), respectively 1,527 3,004 (15)
Effects of settlements, net of tax of $1,598, $193, and $0, respectively 2,557 308 0
Other comprehensive income (loss), net of tax 10,003 8,483 (46,249)
Comprehensive income $ 48,257 $ 60,665 $ 33,760