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Accumulated Other Comprehensive Income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 294,142 $ 281,871  
Defined benefit pension plan [Abstract]      
Net gain (loss) during year 769 (509) $ 72
Amortization of net loss [1] 136 90 102
Defined benefit pension plan 905 (419) 174
Tax expense (benefit) 226 (105) 66
Total other comprehensive income (loss) 679 (314) 108
Ending balance 274,629 294,142 281,871
Accumulated Other Comprehensive Income (Loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2,144) (1,830) (1,938)
Defined benefit pension plan [Abstract]      
Ending balance $ (1,465) $ (2,144) $ (1,830)
[1] These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs.