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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 (721)    (721)      
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   59,374      
Stock-based compensation 9,798    9,798      
Common stock dividends (37,161)       (37,161)   
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 (840)          (840)
Net income 79,373       79,373   
Balance at Sep. 30, 2011 43,750 120 6,059 38,411 (840)
Balance, shares at Sep. 30, 2011   12,006,075      
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 (418)    (418)      
Restricted stock grants, net of forfeitures    1 (1)      
Restricted stock grants, net of forfeitures, shares   80,700      
Stock-based compensation 9,358    9,358      
Common stock dividends (35,609)       (35,609)   
Change in fair value of derivative instrument, net of income tax 66          66
Net income 49,303       49,303   
Balance at Sep. 30, 2012 $ 64,993 $ 119 $ 9,234 $ 56,185 $ (545)
Balance, shares at Sep. 30, 2012   11,873,156