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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Preferred Stock
Common Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Common Stock Held in Treasury
Balance at beginning of period (value) at Dec. 31, 2010 $ 298,004 $ 0 $ 380 $ 142,344 $ 255,741 $ (3,049) $ (97,412)
Balance at beginning of period (shares) at Dec. 31, 2010   0 38,002       6,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     268        
Shares issued under share-based compensation plan (value) 3   3        
Exercise of stock options and warrants (value) 2,458     2,458      
Income tax benefit from exercise of stock options and warrants (value) 2,088     2,088      
Share-based compensation expense (value) 495     495      
Net income 56,327       56,327    
Currency translation adjustment, net of tax (value) (8,180)         (8,180)  
Repurchases of treasury stock (shares)             1,360
Repurchases of treasury stock (value) (55,308)           (55,308)
Balance at end of period (value) at Sep. 30, 2011 295,887 0 383 147,385 312,068 (11,229) (152,720)
Balance at end of period (shares) at Sep. 30, 2011   0 38,270       8,200
Balance at beginning of period (value) at Dec. 31, 2011 315,372 0 383 147,649 333,523 (13,463) (152,720)
Balance at beginning of period (shares) at Dec. 31, 2011   0 38,291       8,200
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     50        
Shares issued under share-based compensation plan (value) 0   0        
Exercise of stock options and warrants (value) 506     506      
Income tax benefit from exercise of stock options and warrants (value) 476     476      
Share-based compensation expense (value) 975     975      
Net income 52,750       52,750    
Currency translation adjustment, net of tax (value) 8,082         8,082  
Repurchases of treasury stock (shares)             1,500
Repurchases of treasury stock (value) (61,275)           (61,275)
Balance at end of period (value) at Sep. 30, 2012 $ 316,886 $ 0 $ 383 $ 149,606 $ 386,273 $ (5,381) $ (213,995)
Balance at end of period (shares) at Sep. 30, 2012   0 38,341       9,700