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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) 428     428      
Net income 20,264       20,264    
Currency translation adjustment, net of tax (value) 6,231         6,231  
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
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        
Share-based compensation expense (value) 550     550      
Net income 22,682       22,682    
Currency translation adjustment, net of tax (value) (255)         (255)  
Balance at end of period (value) at Mar. 31, 2014 $ 437,336 $ 0 $ 394 $ 177,225 $ 520,410 $ (8,006) $ (252,687)
Balance at end of period (shares) at Mar. 31, 2014   0 39,382       10,429