EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		5 Months Ended
	Jan. 15, 2016	Aug. 20, 2015	Aug. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Jan. 15, 2016
Basic earnings per common share
Net income				$ 19,855	$ 48,386
Less: preferred share dividends				14,841	9,969
Net income available to common shareholders				$ 5,014	$ 38,417
Weighted average number of common shares outstanding - basic (in shares)				86,022,000	94,035,000
Basic earnings per common share (in usd per share)				$ 0.06	$ 0.41
Diluted earnings per common share
Net income available to common shareholders				$ 5,014	$ 38,417
Weighted average number of common shares outstanding - basic (in shares)				86,022,000	94,035,000
Share based compensation plans (in shares)				771,000	818,000
Weighted average number of common shares outstanding - diluted (in shares)				86,793,000	94,853,000
Diluted earnings per common share (in usd per share)				$ 0.06	$ 0.41
Anti-dilutive shares excluded from the dilutive computation (in shares)				551,000	670,000
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