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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Basic earnings per share:        
Net income $ 176,934 $ 181,900 $ 496,653 $ 512,351
Weighted average common shares outstanding - basic (in shares) 351,475 362,180 354,272 367,190
Basic earnings per share (in dollars per share) $ 0.50 $ 0.50 $ 1.40 $ 1.40
Diluted earnings per share:        
Net income $ 176,934 $ 181,900 $ 496,653 $ 512,351
Diluted income available to common shareholders $ 181,500 $ 186,466 $ 510,351 $ 526,049
Weighted average common shares outstanding - basic (in shares) 351,475 362,180 354,272 367,190
Effect of dilutive securities:        
Weighted average common shares outstanding - diluted (in shares) 372,575 382,905 375,266 387,765
Diluted earnings per share (in dollars per share) $ 0.49 $ 0.49 $ 1.36 $ 1.36
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 $ 13,698 $ 13,698
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) 2,072 1,697 1,966 1,547