EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 22,445	$ 27,198	$ 89,734	$ 97,887
Less: Preferred dividends	(4,200)	(4,993)	(12,600)	(13,287)
Allocation to participating securities	(69)	(47)	(305)	(127)
Attributable to non-controlling interest	(55)	(115)	(289)	(454)
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 18,121	$ 22,043	$ 76,540	$ 84,019
Denominator:
Weighted average common shares outstanding - basic (in shares)	103,253,000	86,492,000	98,105,000	86,428,000
Dilutive effect of equity-based compensation awards (in shares)	379,000	909,000	366,000	891,000
Weighted average common shares outstanding - diluted (in shares)	103,632,000	87,401,000	98,471,000	87,319,000
Earnings per share:
Basic (in dollars per share)	$ 0.18	$ 0.25	$ 0.78	$ 0.97
Diluted (in dollars per share)	$ 0.17	$ 0.25	$ 0.78	$ 0.96
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)	464,924	449,027	464,924	449,027