EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 27,198	$ 13,606	$ 97,887	$ 40,498
Less: Preferred dividends	(4,993)	(4,147)	(13,287)	(12,441)
Allocation to participating securities	(47)	(29)	(127)	(89)
Attributable to non-controlling interest	(115)	(66)	(454)	(220)
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 22,043	$ 9,364	$ 84,019	$ 27,748
Denominator:
Weighted average common shares outstanding - basic	86,492	85,995	86,428	85,844
Dilutive effect of equity-based compensation awards (in shares)	909	1,070	891	1,156
Weighted average common shares outstanding - diluted	87,401	87,065	87,319	87,000
Earnings per share:
Basic (in dollars per share)	$ 0.25	$ 0.11	$ 0.97	$ 0.32
Diluted (in dollars per share)	$ 0.25	$ 0.11	$ 0.96	$ 0.32