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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, 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)     3        
Shares issued under share-based compensation plan (value) 0   0        
Exercise of stock options (shares)     47        
Exercise of stock options (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
Balance at beginning of period (value) at Dec. 31, 2012 352,416 0 388 159,081 413,882 (6,940) (213,995)
Balance at beginning of period (shares) at Dec. 31, 2012   0 38,796       9,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued under share-based compensation plan (shares)     4        
Shares issued under share-based compensation plan (value) 0   0        
Exercise of stock options (shares)     533        
Exercise of stock options (value) 8,442   5 8,437      
Income tax benefit from exercise of stock options and warrants (value) 7,232     7,232      
Share-based compensation expense (value) 1,268     1,268      
Net income 59,068       59,068    
Currency translation adjustment, net of tax (value) (2,222)         (2,222)  
Repurchases of treasury stock (shares)             729
Repurchases of treasury stock (value) (38,692)           (38,692)
Balance at end of period (value) at Sep. 30, 2013 $ 387,512 $ 0 $ 393 $ 176,018 $ 472,950 $ (9,162) $ (252,687)
Balance at end of period (shares) at Sep. 30, 2013   0 39,333       10,429