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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings (Accumulated Deficit) [Member]
Shareholders' Equity, shares at Dec. 31, 2012   386,608,000      
Shareholders' Equity at Dec. 31, 2012 $ 2,189,616 $ 3,866 $ 3,030,889 $ (992) $ (844,147)
Stock option exercises, shares   1,432,000      
Stock option exercises 19,411 $ 14 19,397 0 0
Share issuances, net of cancellations, shares   1,002,000      
Share issuances, net of cancellations   $ 10 (10)    
Dividends declared (57,530)       (57,530)
Share repurchases, shares   (7,742,000)      
Share repurchases (127,661) $ (77) (3,063)   (124,521)
Share-based compensation 14,474 $ 0 14,474 0 0
Excess tax benefits (deficiencies) from share-based compensation (9,671)   (9,671)    
Net income 2,620,116       2,620,116
Other comprehensive income 197     197  
Shareholders' Equity, shares at Dec. 31, 2013   381,300,000      
Shareholders' Equity at Dec. 31, 2013 4,648,952 $ 3,813 3,052,016 (795) 1,593,918
Stock option exercises, shares   1,422,000      
Stock option exercises 15,627 $ 14 15,613 0 0
Share issuances, net of cancellations, shares   (43,000)      
Dividends declared (86,370)   72   (86,442)
Share repurchases, shares   (13,220,000)      
Share repurchases (253,019) $ (132)     (252,887)
Share-based compensation 13,812 $ 0 13,786 0 26
Excess tax benefits (deficiencies) from share-based compensation (8,491)   (8,491)    
Net income 474,338       474,338
Other comprehensive income $ 105     105  
Shareholders' Equity, shares at Dec. 31, 2014 369,458,530 369,459,000      
Shareholders' Equity at Dec. 31, 2014 $ 4,804,954 $ 3,695 3,072,996 (690) 1,728,953
Stock option exercises, shares   904,000      
Stock option exercises 10,534 $ 9 10,525 0 0
Share issuances, net of cancellations, shares   428,000      
Share issuances, net of cancellations 7,424 $ 4 7,420    
Dividends declared (117,873)   8   (117,881)
Share repurchases, shares   (21,642,000)      
Share repurchases (442,738) $ (217)     (442,521)
Share-based compensation 16,888 $ 0 16,888 0 0
Excess tax benefits (deficiencies) from share-based compensation (14,035)   (14,035)    
Net income 494,090       494,090
Other comprehensive income $ 81     81  
Shareholders' Equity, shares at Dec. 31, 2015 349,148,351 349,149,000      
Shareholders' Equity at Dec. 31, 2015 $ 4,759,325 $ 3,491 $ 3,093,802 $ (609) $ 1,662,641