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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Income from continuing operations	$ 10,374	$ 27,198	$ 21,955	$ 48,734	$ 84,758	$ 13,606	$ 16,301	$ 10,591	$ 108,261	$ 125,256	$ 20,431
Less: Preferred dividends									(18,232)	(16,588)	(16,588)
Premium on redemption of Series A Preferred Stock									(2,125)	0	0
Allocation to participating securities									(342)	(118)	(94)
Attributable to non-controlling interest									(456)	(819)	(46)
Income from continuing operations attributable to common stockholders									87,106	107,731	3,703
Income from discontinued operations attributable to common stockholders									0	0	486
Net income attributable to common stockholders, net of amount allocated to participating securities									$ 87,106	$ 107,731	$ 4,189
Denominator:
Weighted average common shares outstanding - basic									86,874	85,920	85,242
Dilutive effect of equity-based compensation awards (in shares)									469	1,224	324
Weighted average common shares outstanding - diluted									87,343	87,144	85,566
Earnings per common share - basic:
Net income per share from continuing operations (in dollars per share)									$ 1.00	$ 1.25	$ 0.04
Net income per share from discontinued operations (in dollars per share)									0.00	0.00	0.01
Net income per common share (in dollars per share)					$ 0.93	$ 0.11	$ 0.14	$ 0.07	1.00	1.25	0.05
Earnings per common share - diluted:
Net income from continuing operations (in dollars per share)									1.00	1.24	0.04
Net income from discontinued operations (in dollars per share)									0.00	0.00	0.01
Net income per share (in dollars per share)					$ 0.92	$ 0.11	$ 0.14	$ 0.07	$ 1.00	$ 1.24	$ 0.05