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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Beginning Balance at Dec. 31, 2009 $ 189,820 $ 140 $ 1,157 $ 188,218 $ 305
Beginning Balance, shares at Dec. 31, 2009   13,957,596      
Exercise of stock options 452   452    
Exercise of stock options, shares   6,667      
Tax benefits associated with stock-based compensation arrangements 2,808   2,808    
Repurchase of common stock (115,517) (7) (15,198) (100,312)  
Repurchase of common stock, shares (687,340) (687,340)      
Restricted stock grants, net of forfeitures, shares   39,899      
Stock-based compensation 11,987   11,987    
Common stock dividends (44,541)     (44,541)  
Change in net unrealized gains and losses on marketable securities, net of income tax (265)       (265)
Net income 131,260     131,260  
Ending Balance at Dec. 31, 2010 176,004 133 1,206 174,625 40
Ending Balance, shares at Dec. 31, 2010   13,316,822      
Tax shortfall associated with stock-based compensation arrangements (569)   (569)    
Repurchase of common stock (202,664) (16) (13,575) (189,073)  
Repurchase of common stock, shares (1,581,444) (1,581,444)      
Restricted stock grants, net of forfeitures   1 (1)    
Restricted stock grants, net of forfeitures, shares   57,078      
Stock-based compensation 13,234   13,234    
Common stock dividends (49,105)     (49,105)  
Change in net unrealized gains and losses on marketable securities, net of income tax (40)       (40)
Change in fair value of derivative instrument, net of income tax (611)       (611)
Net income 106,044     106,044  
Ending Balance at Dec. 31, 2011 42,293 118 295 42,491 (611)
Ending Balance, shares at Dec. 31, 2011   11,792,456      
Tax shortfall associated with stock-based compensation arrangements (245)   (245)    
Repurchase of common stock (25,001) (5) (5,214) (19,782)  
Repurchase of common stock, shares (484,841) (484,841)      
Restricted stock grants, net of forfeitures   1 (1)    
Restricted stock grants, net of forfeitures, shares   79,684      
Stock-based compensation 5,464   5,464    
Common stock dividends (47,328)     (47,328)  
Change in fair value of derivative instrument, net of income tax (125)       (125)
Net income 65,930     65,930  
Ending Balance at Dec. 31, 2012 $ 40,988 $ 114 $ 299 $ 41,311 $ (736)
Ending Balance, shares at Dec. 31, 2012   11,387,299