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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in accumulated other comprehensive income [Roll Forward]        
Balance     $ 441,028  
Other comprehensive income before reclassifications $ 1,595   7,334  
Amounts reclassified from accumulated other comprehensive income (99)   (297)  
Total other comprehensive income (loss), net of tax 1,496 $ (83) 7,037 $ 160
Balance 469,520   469,520  
AOCI Attributable to Parent [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance (5,487)   (11,028)  
Total other comprehensive income (loss), net of tax     7,037  
Balance (3,991)   (3,991)  
Foreign Currency Translation Adjustments [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance (5,796)   (11,252)  
Other comprehensive income before reclassifications 1,595   7,051  
Amounts reclassified from accumulated other comprehensive income 0   0  
Total other comprehensive income (loss), net of tax 1,595   7,051  
Balance (4,201)   (4,201)  
Unrecognized Postretirement Benefit Costs (Credit) [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance 309   224  
Other comprehensive income before reclassifications 0   283  
Amounts reclassified from accumulated other comprehensive income (99)   (297)  
Total other comprehensive income (loss), net of tax (99)   (14)  
Balance $ 210   $ 210