EARNINGS PER SHARE - Summary of Components Used to Calculate Basic and Diluted (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Income from continuing operations	$ 84,758	$ 13,606	$ 16,301	$ 10,591	$ 4,517	$ 3,766	$ 9,201	$ 2,947	$ 125,256	$ 20,431	$ 6,625
Less: Preferred dividends									16,588	16,588	14,590
Allocation to participating securities									118	94	73
Attributable to non-controlling interest									819	46	44
Income (loss) from continuing operations attributable to common stockholders									107,731	3,703	(8,082)
Income (loss) from discontinued operations attributable to common stockholders										486	(703)
Net income (loss) attributable to common stockholders, net of amount allocated to participating securities									$ 107,731	$ 4,189	$ (8,785)
Denominator:
Weighted average common shares outstanding - basic									85,920	85,242	70,327
Dilutive effect of equity-based compensation awards (in shares)									1,224	324
Weighted average common shares outstanding - diluted									87,144	85,566	70,327
Earnings per common share - basic:
Net income (loss) from continuing operations (in dollars per share)	$ 0.93	$ 0.11	$ 0.14	$ 0.07					$ 1.25	$ 0.04	$ (0.11)
Net income (loss) from discontinued operations (in dollars per share)										0.01	(0.01)
Net income (loss) (in dollars per share)	0.93	0.11	0.14	0.07					1.25	0.05	(0.12)
Earnings per common share - diluted:
Net income (loss) from continuing operations (in dollars per share)	0.92	0.11	0.14	0.07					1.24	0.04	(0.11)
Net income (loss) from discontinued operations (in dollars per share)										0.01	(0.01)
Net income (loss) (in dollars per share)	$ 0.92	$ 0.11	$ 0.14	$ 0.07					$ 1.24	$ 0.05	$ (0.12)