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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Basic earnings per share: |  |
Net income | $ 151,941 | $ 143,637
Weighted average common shares outstanding - basic (in shares) | 355,653 | 370,908
Basic earnings per share (in dollars per share) | $ 0.43 | $ 0.39
Diluted earnings per share: |  |
Net income | $ 151,941 | $ 143,637
Diluted income available to common shareholders | $ 156,507 | $ 148,203
Weighted average common shares outstanding - basic (in shares) | 355,653 | 370,908
Effect of dilutive securities: |  |
Weighted average common shares outstanding - diluted (in shares) | 376,667 | 391,562
Diluted earnings per share (in dollars per share) | $ 0.42 | $ 0.38
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% |
Diluted earnings per share: |  |
Dilutive securities | $ 4,566 | $ 4,566
Effect of dilutive securities: |  |
Dilutive securities (in shares) | 19,028 | 19,028
Unvested RSUs |  |
Effect of dilutive securities: |  |
Unvested RSUs (in shares) | 1,986 | 1,626

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