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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Earnings [Member]
Beginning Balance at Dec. 31, 2009 $ 86,028 $ 457   $ 70,100 $ (144) $ 15,615
Beginning Balance, Shares at Dec. 31, 2009   45,658        
Net income 35,206         35,206
Unrealized gains (losses) on hedging derivatives, net of taxes (278)       (278)  
Unrealized gains (losses) on available for-sale securities, net of taxes (4)       (4)  
Realized gains on available for-sale securities, net of taxes of $12 (19)       (19)  
Common stock purchased for treasury (782)   (782)      
Common stock purchased for treasury, Shares     50      
Share-based compensation 5,049     5,049    
Share-based compensation, Shares   9        
Exercise of stock options 1,747 1   1,746    
Exercise of stock options, Shares 144 144        
Excess tax benefits 554     554    
Ending Balance at Dec. 31, 2010 127,501 458 (782) 77,449 (445) 50,821
Ending Balance, Shares at Dec. 31, 2010   45,811 50      
Net income 50,546         50,546
Unrealized gains (losses) on hedging derivatives, net of taxes (7)       (7)  
Reclassification of loss on derivatives, net of taxes 92       92  
Common stock purchased for treasury (23,112)   (23,112)      
Common stock purchased for treasury, Shares     1,607      
Share-based compensation 6,452     6,452    
Share-based compensation, Shares   4        
Exercise of stock options 1,681 2   1,679    
Exercise of stock options, Shares 140 140        
Excess tax benefits 140     140    
Ending Balance at Dec. 31, 2011 163,293 460 (23,894) 85,720 (360) 101,367
Ending Balance, Shares at Dec. 31, 2011   45,955 1,657      
Net income 69,447         69,447
Unrealized gains (losses) on hedging derivatives, net of taxes 137       137  
Common stock purchased for treasury (15,242)   (15,242)      
Common stock purchased for treasury, Shares     753      
Share-based compensation 7,811 6   7,805    
Share-based compensation, Shares   570        
Restricted shares forfeited     10      
Exercise of stock options 8,049 5   8,044    
Exercise of stock options, Shares 611 611        
Excess tax benefits 564     564    
Ending Balance at Dec. 31, 2012 $ 234,059 $ 471 $ (39,136) $ 102,133 $ (223) $ 170,814
Ending Balance, Shares at Dec. 31, 2012   47,136 2,420