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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per common share
Net income	$ 73,202	$ 19,855
Less: preferred share dividends	10,656	14,841
Net income available to common shareholders	$ 62,546	$ 5,014
Weighted average number of common shares outstanding - basic (in shares)	83,322	86,022
Basic earnings per common share (in usd per share)	$ 0.75	$ 0.06
Diluted earnings per common share
Net income available to common shareholders	$ 62,546	$ 5,014
Weighted average number of common shares outstanding - basic (in shares)	83,322	86,022
Share based compensation plans (in shares)	399	771
Weighted average number of common shares outstanding - diluted (in shares)	83,721	86,793
Diluted earnings per common share (in usd per share)	$ 0.75	$ 0.06
Weighted average anti-dilutive shares excluded from the dilutive computation (in shares)	810	551

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