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Unaudited Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2010 $ 176,004 $ 133 $ 1,206 $ 174,625 $ 40
Beginning Balance, shares at Dec. 31, 2010   13,316,822      
Tax shortfall associated with stock-based compensation arrangements (872)   (872)    
Repurchase of common stock (182,664) (14) (4,224) (178,426)  
Repurchase of common stock, shares   (1,370,121)      
Restricted stock grants, net of forfeitures 1 1      
Restricted stock grants, net of forfeitures, shares   62,062      
Stock-based compensation 6,328   6,328    
Common stock dividends (25,183)     (25,183)  
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 (645)       (645)
Net income 65,438     65,438  
Balance at Jun. 30, 2011 38,367 120 2,438 36,454 (645)
Balance, shares at Jun. 30, 2011   12,008,763      
Beginning Balance at Dec. 31, 2011 42,293 118 295 42,491 (611)
Beginning Balance, shares at Dec. 31, 2011   11,792,456      
Tax shortfall associated with stock-based compensation arrangements (393)   (393)    
Restricted stock grants, net of forfeitures   1 (1)    
Restricted stock grants, net of forfeitures, shares   81,834      
Stock-based compensation 5,830   5,830    
Common stock dividends (23,737)     (23,737)  
Change in fair value of derivative instrument, net of income tax 53       53
Net income 45,201     45,201  
Balance at Jun. 30, 2012 $ 69,247 $ 119 $ 5,731 $ 63,955 $ (558)
Balance, shares at Jun. 30, 2012   11,874,290