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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2017 $ 376 $ 249,935 $ 37,609 $ 1,857 $ (12,719) $ 277,058
Balance, shares at Dec. 31, 2017 37,618       (1,386)  
Net loss     (3,855)     (3,855)
Foreign currency translation income (loss)       7,139   7,139
Comprehensive income (loss)           3,284
Comprehensive income           3,499
Equity compensation $ 1 1,353       1,354
Equity compensation, shares 225          
Exercise of options $ 4 1,886     $ (1,872) 18
Exercise of options, shares 317       (98)  
Employee stock purchase plan   588       588
Employee stock purchase plan, shares 37          
Redemption and repurchase of stock to cover tax withholdings   (1,511)       (1,511)
Redemption and repurchase of stock to cover tax withholdings, shares (82)          
Balance at Mar. 31, 2018 $ 381 252,251 33,969 8,996 $ (14,591) 281,006
Balance, shares at Mar. 31, 2018 38,115       (1,484)  
Cumulative effect of adjustment | ASU 606 [Member]     215     215
Balance at Dec. 31, 2018 $ 385 260,361 34,984 (6,072) $ (14,591) 275,067
Balance, shares at Dec. 31, 2018 38,463       (1,484)  
Net loss     (297)     (297)
Foreign currency translation income (loss)       (3,781)   (3,781)
Comprehensive income (loss)           (4,078)
Equity compensation $ 2 1,978       1,980
Equity compensation, shares 205          
Exercise of options $ 1 1,450       1,451
Exercise of options, shares 145          
Employee stock purchase plan   578       578
Employee stock purchase plan, shares 25          
Redemption and repurchase of stock to cover tax withholdings   (2,376)       (2,376)
Redemption and repurchase of stock to cover tax withholdings, shares (82)          
Balance at Mar. 31, 2019 $ 388 $ 261,991 $ 34,687 $ (9,853) $ (14,591) $ 272,622
Balance, shares at Mar. 31, 2019 38,756       (1,484)