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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, 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 expense or benefit (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
Balance at beginning of period (value) at Dec. 31, 2013 414,359 0 394 176,675 497,728 (7,751) (252,687)
Balance at beginning of period (shares) at Dec. 31, 2013   0 39,377       10,429
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)     125        
Exercise of stock options (value) 2,262   1 2,261      
Income tax benefit from exercise of stock options and warrants (value) 1,813     1,813      
Share-based compensation expense (value) 1,370     1,370      
Net income 58,225       58,225    
Currency translation adjustment, net of tax expense or benefit (4,628)         (4,628)  
Repurchases of treasury stock (shares)             771
Repurchases of treasury stock (value) (43,947)           (43,947)
Balance at end of period (value) at Sep. 30, 2014 $ 429,454 $ 0 $ 395 $ 182,119 $ 555,953 $ (12,379) $ (296,634)
Balance at end of period (shares) at Sep. 30, 2014   0 39,507       11,200