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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator:                      
Net income $ 228,027 $ 107,769 $ 103,324 $ 54,971 $ 217,095 $ 140,545 $ 41,880 $ 74,819 $ 494,090 $ 474,338 $ 2,620,116
Less: earnings distributed to participating securities                 (755) (583) (407)
Less: undistributed earnings allocated to participating securities                 (2,448) (2,668) (19,201)
Numerator for basic earnings per share                 490,887 471,087 2,600,508
Add back: undistributed earnings allocated to participating securities                 2,448 2,668 19,201
Less: undistributed earnings reallocated to participating securities                 (2,429) (2,643) (18,845)
Numerator for diluted earnings per share                 $ 490,906 $ 471,112 $ 2,600,864
Denominator:                      
Basic shares outstanding 348,699 350,147 361,009 366,748 369,533 373,531 376,072 383,991 356,576 370,377 383,077
Effect of dilutive securities (shares) 3,047 3,225 3,232 3,362 3,734 3,761 3,592 3,815 3,217 3,725 3,789
Diluted shares outstanding (shares) 351,746 353,372 364,241 370,110 373,267 377,292 379,664 387,806 359,793 374,102 386,866
Earnings per share:                      
Basic (usd per share) $ 0.65 $ 0.31 $ 0.28 $ 0.15 $ 0.58 $ 0.37 $ 0.11 $ 0.19 $ 1.38 $ 1.27 $ 6.79
Diluted (usd per share) $ 0.64 $ 0.30 $ 0.28 $ 0.15 $ 0.58 $ 0.37 $ 0.11 $ 0.19 $ 1.36 $ 1.26 $ 6.72