EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income	$ 34,083	$ 21,955	$ 67,289	$ 70,689
Less: Preferred dividends	(4,200)	(4,147)	(8,400)	(8,294)
Allocation to participating securities	(126)	(51)	(240)	(80)
Attributable to non-controlling interest	(114)	(90)	(234)	(339)
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 29,643	$ 17,667	$ 58,415	$ 61,976
Denominator:
Weighted average common shares outstanding - basic (in shares)	98,184,000	86,433,000	95,488,000	86,396,000
Dilutive effect of equity-based compensation awards (in shares)	522,000	922,000	495,000	868,000
Weighted average common shares outstanding - diluted (in shares)	98,706,000	87,355,000	95,983,000	87,264,000
Earnings per share:
Basic (in dollars per share)	$ 0.30	$ 0.20	$ 0.61	$ 0.72
Diluted (in dollars per share)	$ 0.30	$ 0.20	$ 0.61	$ 0.71
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)	619,429	449,027	619,429	449,027