EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income	$ 21,955	$ 16,301	$ 70,689	$ 26,892
Less: Preferred dividends	(4,147)	(4,147)	(8,294)	(8,294)
Allocation to participating securities	(51)	(38)	(80)	(60)
Attributable to non-controlling interest	(90)	(97)	(339)	(154)
Net income attributable to common stockholders, net of amount allocated to participating securities	$ 17,667	$ 12,019	$ 61,976	$ 18,384
Denominator:
Weighted average common shares outstanding - basic	86,433	85,831	86,396	85,768
Dilutive effect of equity-based compensation awards	922	1,177	868	1,179
Weighted average common shares outstanding - diluted	87,355	87,008	87,264	86,947
Earnings per share:
Basic (in dollars per share)	$ 0.20	$ 0.14	$ 0.72	$ 0.21
Diluted (in dollars per share)	$ 0.20	$ 0.14	$ 0.71	$ 0.21