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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Common Stock Held in Treasury
Balance at beginning of period (shares) at Dec. 31, 2014   0 39,708       11,200
Balance at beginning of period (value) at Dec. 31, 2014 $ 434,441 $ 0 $ 397 $ 188,062 $ 582,894 $ (40,278) $ (296,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     5        
Shares issued under share-based compensation plan (value) 0   $ 0        
Exercise of stock options (shares)     145        
Exercise of stock options (value) 2,901   $ 2 2,899      
Income tax benefit from exercise of stock options (value) 1,617     1,617      
Share-based compensation expense (value) 1,399     1,399      
Net income 30,127       30,127    
Currency translation adjustment (13,656)         (13,656)  
Repurchases of treasury stock (shares)             463
Repurchases of treasury stock (value) (22,974)           $ (22,974)
Balance at end of period (shares) at Jun. 30, 2015   0 39,858       11,663
Balance at end of period (value) at Jun. 30, 2015 433,855 $ 0 $ 399 193,977 613,021 (53,934) $ (319,608)
Balance at beginning of period (shares) at Dec. 31, 2015   0 40,288       12,052
Balance at beginning of period (value) at Dec. 31, 2015 431,382 $ 0 $ 403 202,393 643,604 (78,410) $ (336,608)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     7        
Shares issued under share-based compensation plan (value) 0   $ 0        
Share-based compensation expense (value) 1,021     1,021      
Net income 24,847       24,847    
Dividends paid (7,061)       (7,061)    
Currency translation adjustment (16,703)         (16,703)  
Balance at end of period (shares) at Jun. 30, 2016   0 40,295       12,052
Balance at end of period (value) at Jun. 30, 2016 $ 433,486 $ 0 $ 403 $ 203,414 $ 661,390 $ (95,113) $ (336,608)