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Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated other comprehensive income (loss)      
Accumulated other comprehensive loss, beginning of period $ (46,178)    
Accumulated other comprehensive income (loss), net of tax      
Total other comprehensive income (loss), net of tax 1,875 $ (2,618) $ 3,669
Accumulated other comprehensive loss, end of period (44,303) (46,178)  
Accumulated defined benefit plan adjustment      
Accumulated other comprehensive income (loss)      
Accumulated other comprehensive loss, beginning of period (46,977) (43,915)  
Accumulated other comprehensive income (loss), net of tax      
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1,559 (3,062)  
Total other comprehensive income (loss), net of tax 1,559 (3,062)  
Accumulated other comprehensive loss, end of period (45,418) (46,977) (43,915)
Accumulated translation adjustment      
Accumulated other comprehensive income (loss)      
Accumulated other comprehensive loss, beginning of period 799 355  
Accumulated other comprehensive income (loss), net of tax      
Other comprehensive loss, net of tax, before reclassifications 316 444  
Total other comprehensive income (loss), net of tax 316 444  
Accumulated other comprehensive loss, end of period 1,115 799 355
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income (loss)      
Accumulated other comprehensive loss, beginning of period (46,178) (43,560)  
Accumulated other comprehensive income (loss), net of tax      
Other comprehensive loss, net of tax, before reclassifications 316 444  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1,559 (3,062)  
Total other comprehensive income (loss), net of tax 1,875 (2,618) 3,669
Accumulated other comprehensive loss, end of period $ (44,303) $ (46,178) $ (43,560)