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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in accumulated other comprehensive income [Roll Forward]    
Balance $ 453,654  
Other comprehensive income before reclassifications 2,219  
Amounts reclassified from accumulated other comprehensive income (5)  
Total other comprehensive income, net of tax 2,214 $ 2,688
Balance 459,509  
AOCI Attributable to Parent [Member]    
Changes in accumulated other comprehensive income [Roll Forward]    
Balance (4,109)  
Total other comprehensive income, net of tax 2,214  
Balance (1,895)  
Foreign Currency Translation Adjustments [Member]    
Changes in accumulated other comprehensive income [Roll Forward]    
Balance (4,225)  
Other comprehensive income before reclassifications 2,219  
Amounts reclassified from accumulated other comprehensive income 0  
Total other comprehensive income, net of tax 2,219  
Balance (2,006)  
Unrecognized Postretirement Benefit Costs (Credit) [Member]    
Changes in accumulated other comprehensive income [Roll Forward]    
Balance 116  
Other comprehensive income before reclassifications 0  
Amounts reclassified from accumulated other comprehensive income (5)  
Total other comprehensive income, net of tax (5)  
Balance $ 111