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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in accumulated other comprehensive income [Roll Forward]      
Balance at beginning of period $ 453,654 $ 441,028 $ 391,979
Other comprehensive income before reclassifications (5,324) 7,316  
Amounts reclassified from accumulated other comprehensive income (161) (397)  
Total other comprehensive income (loss), net of tax (5,485) 6,919 (4,554)
Balance at end of period 467,201 453,654 441,028
Accumulated Other Comprehensive Income [Member]      
Changes in accumulated other comprehensive income [Roll Forward]      
Balance at beginning of period (4,109) (11,028) (6,474)
Total other comprehensive income (loss), net of tax (5,485) 6,919 (4,554)
Balance at end of period (9,594) (4,109) (11,028)
Foreign Currency Translation Adjustments [Member]      
Changes in accumulated other comprehensive income [Roll Forward]      
Balance at beginning of period (4,225) (11,252)  
Other comprehensive income before reclassifications (5,473) 7,027  
Amounts reclassified from accumulated other comprehensive income 0 0  
Total other comprehensive income (loss), net of tax (5,473) 7,027  
Balance at end of period (9,698) (4,225) (11,252)
Unrecognized Postretirement Benefit Costs (Credit) [Member]      
Changes in accumulated other comprehensive income [Roll Forward]      
Balance at beginning of period 116 224  
Other comprehensive income before reclassifications 149 289  
Amounts reclassified from accumulated other comprehensive income (161) (397)  
Total other comprehensive income (loss), net of tax (12) (108)  
Balance at end of period $ 104 $ 116 $ 224