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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Earnings (Deficit) [Member]
Beginning balance at Dec. 31, 2008 $ 53,590 $ 455 $ 0 $ 64,808 $ 16 $ (11,689)
Beginning balance, shares at Dec. 31, 2008   45,465 0      
Net income 27,304         27,304
Unrealized losses on hedging derivatives, net of taxes of $3, $273 and $111 in 2011, 2010 and 2009 respectively (167)       (167)  
Unrealized gains (losses) on available for-sale securities, net of taxes $3 and $5 in 2010 and 2009 respectively 7       7  
Repurchase and retirement of the Company's common stock (14,495) (9)   (14,486)    
Repurchase and retirement of the Company's common stock, Share   (909)        
Stock issued in offering, net of issuance costs 14,880 10   14,870    
Stock issued in offering, net of issuance costs, Share   1,000        
Share-based compensation 3,419     3,419    
Exercise of stock options 1,226 1   1,225    
Exercise of stock options, Shares 102 102        
Excess tax benefit 264     264    
Ending balance at Dec. 31, 2009 86,028 457 0 70,100 (144) 15,615
Ending balance, shares at Dec. 31, 2009   45,658 0      
Net income 35,206         35,206
Unrealized losses on hedging derivatives, net of taxes of $3, $273 and $111 in 2011, 2010 and 2009 respectively (278)       (278)  
Unrealized gains (losses) on available for-sale securities, net of taxes $3 and $5 in 2010 and 2009 respectively (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 benefit 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 losses on hedging derivatives, net of taxes of $3, $273 and $111 in 2011, 2010 and 2009 respectively (7)       (7)  
Reclassification of net loss on interest rate corridor 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 benefit 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