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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2016 | Aug. 20, 2015 | Aug. 30, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jan. 15, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Basic earnings per common share |  |  |  |  |  |  |  |
Net income |  |  |  | $ 95,686 | $ 129,460 |  | $ 115,542 | $ 177,846
Less: preferred share dividends |  |  |  | 10,656 | 9,969 |  | 25,497 | 19,938
Net income available to common shareholders |  |  |  | $ 85,030 | $ 119,491 |  | $ 90,045 | $ 157,908
Weighted average number of common shares outstanding - basic (in shares) |  |  |  | 84,141,000 | 91,926,000 |  | 85,076,000 | 92,980,000
Basic earnings per common share (in usd per share) |  |  |  | $ 1.01 | $ 1.30 |  | $ 1.06 | $ 1.70
Diluted earnings per common share |  |  |  |  |  |  |  |
Net income available to common shareholders |  |  |  | $ 85,030 | $ 119,491 |  | $ 90,045 | $ 157,908
Weighted average number of common shares outstanding - basic (in shares) |  |  |  | 84,141,000 | 91,926,000 |  | 85,076,000 | 92,980,000
Share based compensation plans (in shares) |  |  |  | 370,000 | 632,000 |  | 571,000 | 725,000
Weighted average number of common shares outstanding - diluted (in shares) |  |  |  | 84,511,000 | 92,558,000 |  | 85,647,000 | 93,705,000
Diluted earnings per common share (in usd per share) |  |  |  | $ 1.01 | $ 1.29 |  | $ 1.05 | $ 1.69
Anti-dilutive shares excluded from the dilutive computation (in shares) |  |  |  | 16,000 | 7,000 |  | 284,000 | 339,000
August 17, 2015 ASR agreement [Member] |  |  |  |  |  |  |  |
Diluted earnings per common share |  |  |  |  |  |  |  |
Shares repurchased (in shares) | 1,358,380.00 | 4,149,378 | 4,149,378 |  |  | 5,507,758 |  |

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