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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic earnings per share:        
Net income $ 167,778 $ 186,814 $ 319,719 $ 330,451
Weighted average common shares outstanding - basic (in shares) 355,734 368,578 355,694 369,736
Basic earnings per share (in dollars per share) $ 0.47 $ 0.51 $ 0.90 $ 0.89
Diluted earnings per share:        
Net income $ 167,778 $ 186,814 $ 319,719 $ 330,451
Diluted income available to common shareholders $ 172,344 $ 191,380 $ 328,851 $ 339,583
Weighted average common shares outstanding - basic (in shares) 355,734 368,578 355,694 369,736
Effect of dilutive securities:        
Weighted average common shares outstanding - diluted (in shares) 376,603 388,881 376,635 390,236
Diluted earnings per share (in dollars per share) $ 0.46 $ 0.49 $ 0.87 $ 0.87
Effective income tax rate     21.00% 21.00%
9% Convertible Junior Subordinated 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 $ 4,566 $ 9,132 $ 9,132
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) 1,841 1,275 1,913 1,472