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Condensed Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning Balance at Dec. 31, 2009$ 140$ 1,157$ 188,218$ 305$ 189,820
Beginning Balance, Shares at Dec. 31, 200913,957,596    
Exercise of stock options 452  452
Exercise of stock options, Shares6,667    
Tax benefits (shortfall) associated with stock-based compensation arrangements 2,808  2,808
Repurchase of common stock(4)(13,401)(59,823) (73,228)
Repurchase of common stock, Shares(391,646)    
Restricted stock grants, net of forfeitures, Shares16,397    
Stock-based compensation 8,984  8,984
Common stock dividends  (31,224) (31,224)
Change in net unrealized gains (losses) on marketable securities, net of income tax   (10)(10)
Net income  95,377 95,377
Ending Balance at Sep. 30, 2010136 192,548295192,979
Ending Balance, Shares at Sep. 30, 201013,589,014    
Beginning Balance at Dec. 31, 20101331,206174,62540176,004
Beginning Balance, Shares at Dec. 31, 201013,316,822    
Tax benefits (shortfall) associated with stock-based compensation arrangements (721)  (721)
Repurchase of common stock(14)(4,224)(178,426) (182,664)
Repurchase of common stock, Shares(1,370,121)    
Restricted stock grants, net of forfeitures1   1
Restricted stock grants, net of forfeitures, Shares59,374    
Stock-based compensation 9,798  9,798
Common stock dividends  (37,161) (37,161)
Change in net unrealized gains (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
Ending Balance at Sep. 30, 2011$ 120$ 6,059$ 38,411$ (840)$ 43,750
Ending Balance, Shares at Sep. 30, 201112,006,075