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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic earnings per share:        
Net income $ 186,814 $ 118,622 $ 330,451 $ 208,420
Weighted average common shares outstanding - basic (in shares) 368,578 366,918 369,736 354,035
Basic earnings per share (in dollars per share) $ 0.51 $ 0.32 $ 0.89 $ 0.59
Diluted earnings per share:        
Net income $ 186,814 $ 118,622 $ 330,451 $ 208,420
Diluted income available to common shareholders $ 191,380 $ 122,890 $ 339,583 $ 218,550
Weighted average common shares outstanding - basic (in shares) 368,578 366,918 369,736 354,035
Effect of dilutive securities:        
Weighted average common shares outstanding - diluted (in shares) 388,881 394,470 390,236 398,302
Diluted earnings per share (in dollars per share) $ 0.49 $ 0.31 $ 0.87 $ 0.55
Effective income tax rate     21.00% 35.00%
9% Debentures        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate 9.00%   9.00%  
2% Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate   2.00%   2.00%
Diluted earnings per share:        
Dilutive securities $ 0 $ 84 $ 0 $ 907
Effect of dilutive securities:        
Dilutive securities (in shares) 0 3,827 0 16,771
5% Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate   5.00%   5.00%
Diluted earnings per share:        
Dilutive securities $ 0 $ 427 $ 0 $ 1,709
Effect of dilutive securities:        
Dilutive securities (in shares) 0 3,557 0 7,154
9% Debentures        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stated interest rate 9.00%   9.00%  
Diluted earnings per share:        
Dilutive securities $ 4,566 $ 3,757 $ 9,132 $ 7,514
Effect of dilutive securities:        
Dilutive securities (in shares) 19,028 19,028 19,028 19,028
Unvested RSUs        
Effect of dilutive securities:        
Unvested RSUs (in shares) 1,275 1,140 1,472 1,314