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Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning of year at Dec. 31, 2009   $ 72,589 $ 0 $ (597) $ 1,698,954
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options   816 (83)    
Share-based compensation expense 812 651 161    
Tax benefit on sales of incentive stock options 132 132      
Other comprehensive income (loss), net of tax       (143)  
Net income 152,198       152,198
Dividends paid to shareholders         (129,863)
End of year at Dec. 31, 2010 1,794,815 74,188 78 (740) 1,721,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options   1,951 0    
Share-based compensation expense 899 439 460    
Tax benefit on sales of incentive stock options 56 56      
Other comprehensive income (loss), net of tax       740  
Net income 191,164       191,164
Dividends paid to shareholders         (132,142)
End of year at Dec. 31, 2011 1,857,483 76,634 538 0 1,780,311
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options   2,492 0    
Share-based compensation expense (370) 168 (538)    
Tax benefit on sales of incentive stock options 86 86      
Other comprehensive income (loss), net of tax       0  
Net income 116,911       116,911
Dividends paid to shareholders         (134,105)
End of year at Dec. 31, 2012 $ 1,842,497 $ 79,380 $ 0 $ 0 $ 1,763,117