EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 38,001	$ 22,445	$ 85,369	$ 89,734
Less: Preferred dividends	(3,710)	(4,200)	(12,962)	(12,600)
Premium on redemption of preferred stock	0	0	(3,277)	0
Allocation to participating securities	(122)	(69)	(249)	(305)
Attributable to non-controlling interest	(100)	(55)	(204)	(289)
Net income attributable to common stockholders	$ 34,069	$ 18,121	$ 68,677	$ 76,540
Denominator:
Weighted average common shares outstanding - basic (in shares)	103,666,000	103,253,000	103,603,000	98,105,000
Dilutive effect of equity-based compensation awards (in shares)	155,000	379,000	265,000	366,000
Weighted average common shares outstanding - diluted (in shares)	103,821,000	103,632,000	103,868,000	98,471,000
Basic (in dollars per share)	$ 0.33	$ 0.18	$ 0.66	$ 0.78
Diluted (in dollars per share)	$ 0.33	$ 0.17	$ 0.66	$ 0.78
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)	453,664	464,924	453,664	464,924