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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic earnings per share:    
Net income $ 143,637 $ 89,798
Weighted average common shares outstanding - basic (in shares) 370,908 341,009
Basic earnings per share (in dollars per share) $ 0.39 $ 0.26
Diluted earnings per share:    
Net income $ 143,637 $ 89,798
Diluted income available to common shareholders $ 148,203 $ 95,660
Weighted average common shares outstanding - basic (in shares) 370,908 341,009
Effect of dilutive securities:    
Weighted average common shares outstanding - diluted (in shares) 391,562 402,175
Diluted earnings per share (in dollars per share) $ 0.38 $ 0.24
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%  
2% Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stated interest rate   2.00%
Diluted earnings per share:    
Dilutive securities $ 0 $ 823
Effect of dilutive securities:    
Dilutive securities (in shares) 0 29,859
5% Notes    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stated interest rate   5.00%
Diluted earnings per share:    
Dilutive securities $ 0 $ 1,282
Effect of dilutive securities:    
Dilutive securities (in shares) 0 10,791
9% Debentures    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stated interest rate 9.00%  
Diluted earnings per share:    
Dilutive securities $ 4,566 $ 3,757
Effect of dilutive securities:    
Dilutive securities (in shares) 19,028 19,028
Unvested RSUs    
Effect of dilutive securities:    
Unvested RSUs (in shares) 1,626 1,488