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ACCUMULATED OTHER COMPREHENSIVE LOSS, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Balance at beginning of period $ 178,153 $ 164,175 $ 176,470 $ 157,960    
Other comprehensive income before reclassifications     (283)      
Amount reclassified from accumulated other comprehensive loss     63      
Net current period other comprehensive income (797) (7,363) (220) (3,291)    
Balance at end of period 180,276 163,297 180,276 163,297    
ASU 2018-02 [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Effect of adoption of ASU 2018-02 (Topic 220)           $ 0
Accumulated Other Comprehensive (Loss) [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Balance at beginning of period (24,724) (15,553) (24,838) (19,625)    
Effect of adoption of ASU 2018-02 (Topic 220)           $ (463)
Balance at end of period (25,521) $ (22,916) (25,521) $ (22,916)    
Accumulated Other Comprehensive (Loss) [Member] | ASU 2018-02 [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Effect of adoption of ASU 2018-02 (Topic 220) (463)   (463)   $ (463)  
Foreign Currency Translation Adjustment [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Balance at beginning of period     (22,635)      
Other comprehensive income before reclassifications     (294)      
Amount reclassified from accumulated other comprehensive loss     0      
Net current period other comprehensive income     (294)      
Balance at end of period (22,929)   (22,929)      
Foreign Currency Translation Adjustment [Member] | ASU 2018-02 [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Effect of adoption of ASU 2018-02 (Topic 220) 0   0      
Unrealized Holding Gains on Available-for-Sale Securities [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Balance at beginning of period     12      
Other comprehensive income before reclassifications     0      
Amount reclassified from accumulated other comprehensive loss     0      
Net current period other comprehensive income     0      
Balance at end of period 12   12      
Unrealized Holding Gains on Available-for-Sale Securities [Member] | ASU 2018-02 [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Effect of adoption of ASU 2018-02 (Topic 220) 0   0      
Unfunded SERP Liability [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Balance at beginning of period     (2,215)      
Other comprehensive income before reclassifications     11      
Amount reclassified from accumulated other comprehensive loss [1]     63      
Net current period other comprehensive income     74      
Balance at end of period (2,604)   (2,604)      
Unfunded SERP Liability [Member] | ASU 2018-02 [Member]            
Changes in Accumulated Other Comprehensive Loss by Component [Roll Forward]            
Effect of adoption of ASU 2018-02 (Topic 220) $ (463)   $ (463)      
[1] This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP Plan. This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.