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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in accumulated other comprehensive income [Roll Forward]        
Balance at beginning of period     $ 453,654  
Other comprehensive income before reclassifications $ (5,928)   (3,709)  
Amounts reclassified from accumulated other comprehensive income (7)   (12)  
Total other comprehensive income (loss), net of tax (5,935) $ 2,853 (3,721) $ 5,541
Balance at end of period 462,370   462,370  
AOCI Attributable to Parent [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance at beginning of period (1,895)   (4,109)  
Total other comprehensive income (loss), net of tax     (3,721)  
Balance at end of period (7,830)   (7,830)  
Foreign Currency Translation Adjustments [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance at beginning of period (2,006)   (4,225)  
Other comprehensive income before reclassifications (5,935)   (3,716)  
Amounts reclassified from accumulated other comprehensive income 0   0  
Total other comprehensive income (loss), net of tax (5,935)   (3,716)  
Balance at end of period (7,941)   (7,941)  
Unrecognized Postretirement Benefit Costs (Credit) [Member]        
Changes in accumulated other comprehensive income [Roll Forward]        
Balance at beginning of period 111   116  
Other comprehensive income before reclassifications 7   7  
Amounts reclassified from accumulated other comprehensive income (7)   (12)  
Total other comprehensive income (loss), net of tax 0   (5)  
Balance at end of period $ 111   $ 111