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Earnings Per Common 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
Calculations for basic and diluted earnings per common share |  |  |  |
Net income | $ 89,192 | $ 57,983 | $ 158,648 | $ 114,253
Preferred stock dividends | (2,329) | (2,339) | (4,668) | (4,669)
Net income available to common equity | 86,863 | 55,644 | 153,980 | 109,584
Common shareholder dividends | (25,977) | (18,326) | (51,549) | (36,577)
Unvested share-based payment awards | (130) | (110) | (269) | (227)
Undistributed earnings | 60,756 | 37,208 | 102,162 | 72,780
Undistributed earnings allocated to common shareholders | 60,446 | 36,980 | 101,677 | 72,273
Undistributed earnings allocated to unvested share-based payment awards | 310 | 228 | 485 | 507
Undistributed earnings | 60,756 | 37,208 | 102,162 | 72,780
Basic |  |  |  |
Distributed earnings to common shareholders | 25,977 | 18,326 | 51,549 | 36,577
Undistributed earnings allocated to common shareholders | 60,446 | 36,980 | 101,677 | 72,273
Total common shareholders earnings, basic | 86,423 | 55,306 | 153,226 | 108,850
Diluted |  |  |  |
Distributed earnings to common shareholders | 25,977 | 18,326 | 51,549 | 36,577
Undistributed earnings allocated to common shareholders | 60,446 | 36,980 | 101,677 | 72,273
Total common shareholders earnings, diluted | $ 86,423 | $ 55,306 | $ 153,226 | $ 108,850
Weighted average common shares outstanding (in shares) | 170,633 | 151,573 | 167,096 | 151,196
Effect of dilutive common stock awards (in shares) | 2,146 | 1,958 | 2,080 | 2,155
Effect of dilutive common stock warrants (in shares) | 630 | 771 | 744 | 796
Diluted weighted average common shares outstanding (in shares) | 173,409 | 154,302 | 169,920 | 154,147
Basic earnings (loss) per common share (in usd per share) | $ 0.51 | $ 0.36 | $ 0.92 | $ 0.72
Diluted earnings (loss) per common share (in usd per share) | $ 0.50 | $ 0.36 | $ 0.90 | $ 0.71

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