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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)     532        
Exercise of stock options (value) 8,422   5 8,417      
Income tax benefit from exercise of stock options and warrants (value) 7,218     7,218      
Share-based compensation expense (value) 839     839      
Net income 35,927       35,927    
Currency translation adjustment, net of tax expense or benefit (328)         (328)  
Repurchases of treasury stock (shares)             729
Repurchases of treasury stock (value) (38,692)           (38,692)
Balance at end of period (value) at Jun. 30, 2013 365,802 0 393 175,555 449,809 (7,268) (252,687)
Balance at end of period (shares) at Jun. 30, 2013   0 39,332       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)     45        
Exercise of stock options (value) 712   0 712      
Income tax benefit from exercise of stock options and warrants (value) 677     677      
Share-based compensation expense (value) 914     914      
Net income 38,697       38,697    
Currency translation adjustment, net of tax expense or benefit 312         312  
Repurchases of treasury stock (shares)             235
Repurchases of treasury stock (value) (13,314)           (13,314)
Balance at end of period (value) at Jun. 30, 2014 $ 442,357 $ 0 $ 394 $ 178,978 $ 536,425 $ (7,439) $ (266,001)
Balance at end of period (shares) at Jun. 30, 2014   0 39,427       10,664