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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)     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) 325     325      
Net income 17,512       17,512    
Currency translation adjustment, net of tax (value) 7,557         7,557  
Repurchases of treasury stock (shares)             963
Repurchases of treasury stock (value) (38,751)           (38,751)
Balance at end of period (value) at Mar. 31, 2012 302,190 0 383 148,149 351,035 (5,906) (191,471)
Balance at end of period (shares) at Mar. 31, 2012   0 38,309       9,163
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) 428     428      
Net income 20,264       20,264    
Currency translation adjustment, net of tax (value) 6,231         6,231  
Repurchases of treasury stock (shares)             0
Repurchases of treasury stock (value) 0           0
Balance at end of period (value) at Mar. 31, 2013 $ 394,979 $ 0 $ 393 $ 175,144 $ 434,146 $ (709) $ (213,995)
Balance at end of period (shares) at Mar. 31, 2013   0 39,332       9,700