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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
Accum- ulated 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)     15        
Exercise of stock options (value) 48     48      
Income tax benefit from exercise of stock options and warrants (value) 127     127      
Share-based compensation expense (value) 650     650      
Net income 33,861       33,861    
Currency translation adjustment, net of tax (value) 1,675         1,675  
Repurchases of treasury stock (shares)             1,500
Repurchases of treasury stock (value) (61,275)           (61,275)
Balance at end of period (value) at Jun. 30, 2012 290,458 0 383 148,474 367,384 (11,788) (213,995)
Balance at end of period (shares) at Jun. 30, 2012   0 38,309       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)     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 (value) (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