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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Total
Beginning Balance at Dec. 31, 2008 $ 141 $ 17,185 $ 158,834 $ (79) $ 176,081
Beginning Balance, shares at Dec. 31, 2008 14,089,189        
Exercise of stock options 1 6,026     6,027
Exercise of stock options, shares 60,417        
Tax benefits associated with stock-based compensation arrangements   3,011     3,011
Repurchase of common stock (5) (36,016) (44,067)   (80,088)
Repurchase of common stock, shares (451,613)       451,613
Restricted stock grants, net of forfeitures 3 (3)      
Restricted stock grants, net of forfeitures, shares 259,603        
Stock-based compensation   10,954     10,954
Common stock dividends     (31,627)   (31,627)
Change in net unrealized gains and losses on marketable securities, net of income tax       384 384
Net income     105,078   105,078
Ending Balance at Dec. 31, 2009 140 1,157 188,218 305 189,820
Ending 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 (7) (15,198) (100,312)   (115,517)
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 133 1,206 174,625 40 176,004
Ending Balance, shares at Dec. 31, 2010 13,316,822        
Tax shortfall associated with stock-based compensation arrangements   (569)     (569)
Repurchase of common stock (16) (13,575) (189,073)   (202,664)
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 $ 118 $ 295 $ 42,491 $ (611) $ 42,293
Ending Balance, shares at Dec. 31, 2011 11,792,456