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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital in Excess of Par Value [Member]
Accumulated Loss [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017 $ 186,569 $ 347 $ 248,170 $ (52,673) $ (8,919) $ (356)
Beginning Balance, Shares at Dec. 31, 2017   34,708,000       (138,000)
Net income (loss) (8,053)     (8,053)    
Cumulative effect adjustment | ASU 2018-02 and ASU 2014-09 [Member] (652)     415 (1,067)  
Exercise of stock options $ 89   89      
Exercise of stock options, Shares 16,000 16,000        
Restricted stock units issued $ (215) $ (2) (174) 43    
Restricted stock units issued, Shares   51,000        
Share based compensation earned 2,508   2,508      
Share based compensation earned, Shares   38,000        
Adjustment for interest rate swap 222       222  
Translation loss (3,060)       (3,060)  
Ending Balance at Sep. 30, 2018 177,408 $ 349 250,593 (60,354) (12,824) $ (356)
Ending Balance, Shares at Sep. 30, 2018   34,813,000       (138,000)
Beginning Balance at Dec. 31, 2018 178,560 $ 349 251,409 (59,427) (13,415) $ (356)
Beginning Balance, Shares at Dec. 31, 2018   34,954,000       (138,000)
Net income (loss) 9,310     9,310    
Cumulative effect adjustment | ASU 2017-12 and ASU 2016-02 [Member] $ (4,590)     (4,602) 12  
Exercise of stock options, Shares 1,000          
Restricted stock units issued $ (438) $ (4) (425) 17    
Restricted stock units issued, Shares   255,000        
Share based compensation earned 2,773   2,773      
Share based compensation earned, Shares   35,000        
Adjustment for interest rate swap (506)       (506)  
Translation loss (935)       (935)  
Ending Balance at Sep. 30, 2019 $ 184,174 $ 353 $ 253,757 $ (54,736) $ (14,844) $ (356)
Ending Balance, Shares at Sep. 30, 2019   35,244,000       (138,000)