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Consolidated Condensed Statements of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Earnings
Beginning Balance at Dec. 31, 2017 $ 553,874 $ 265,048 $ 15,625 $ (20,444) $ 293,645
Beginning Balance (in shares) at Dec. 31, 2017   36,761,000      
Cumulative effect of accounting change due to adoption of ASU | ASU 2014-09 (3,264)       (3,264)
Cumulative effect of accounting change due to adoption of ASU | ASU 2016-16 31,645       31,645
Cumulative effect of accounting change due to adoption of ASU | ASU 2018-02       (40) 40
Exercise of Common Stock options for cash 751 $ 1,061 (310)    
Exercise of Common Stock options for cash (in shares)   57,000      
Cancellation of restricted stock (659) $ (659)      
Cancelation of restricted stock (in shares)   (24,000)      
Restricted stock and stock option compensation 2,202 $ 1,362 840    
Currency translation, net 11,665     11,665  
Foreign currency hedge, net 1,545     1,545  
Commodity hedge, net (277)     (277)  
Net income 12,966       12,966
Ending Balance at Mar. 31, 2018 610,448 $ 266,812 16,155 (7,551) 335,032
Ending Balance (in shares) at Mar. 31, 2018   36,794,000      
Beginning Balance at Dec. 31, 2018 $ 479,699 $ 140,300 14,934 (39,500) 363,965
Beginning Balance (in shares) at Dec. 31, 2018 33,856,629 33,857,000      
Cumulative effect of accounting change due to adoption of ASU | ASU 2016-02 $ 261       261
Stock repurchase (8,040) $ (8,040)      
Stock repurchase (in shares)   (200,000)      
Exercise of Common Stock options for cash 214 $ 1,021 (807)    
Exercise of Common Stock options for cash (in shares)   13,000      
Cancellation of restricted stock (376) $ (376)      
Cancelation of restricted stock (in shares)   (17,000)      
Stock option compensation 386   386    
Common Stock issued to Board of Directors and employees 1,581 $ 1,581      
Currency translation, net (4,251)     (4,251)  
Foreign currency hedge, net 599     599  
Net income 8,414       8,414
Ending Balance at Mar. 31, 2019 $ 478,487 $ 134,486 $ 14,513 $ (43,152) $ 372,640
Ending Balance (in shares) at Mar. 31, 2019 33,653,179 33,653,000