EARNINGS PER SHARE - Summary of Components Used to Calculate Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net (loss) income	$ (44,708)	$ (35,775)	$ (52,548)	$ (16,214)	$ 8,753	$ 11,626	$ 49,069	$ 12,900	$ (149,245)	$ 82,348	$ 91,126
Less: Preferred dividends									(14,838)	(14,838)	(16,671)
Premium on redemption of preferred stock									0	0	(3,277)
Allocation to participating securities									(81)	(309)	(271)
Attributable to non-controlling interest in Operating Partnership									271	(157)	(205)
Attributable to non-controlling interest in joint venture									5,635	419	0
Net (loss) income attributable to common stockholders									$ (158,258)	$ 67,463	$ 70,702
Denominator:
Weighted average common shares outstanding - basic									104,141	103,887	103,623
Dilutive effect of equity-based compensation awards									0	52	219
Weighted average common shares outstanding - diluted									104,141	103,939	103,842
Basic and diluted (in dollars per share)	$ (0.45)	$ (0.37)	$ (0.52)	$ (0.18)	$ 0.05	$ 0.07	$ 0.43	$ 0.09	$ (1.52)	$ 0.65	$ 0.68