EQUITY AND EARNINGS PER SHARE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended			3 Months Ended
	Mar. 24, 2021	May 27, 2020	May 19, 2020	Feb. 14, 2020	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Feb. 16, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)								33,610,000	33,610,000
Liquidation preference per share (in dollars per share)									$ 25.00
Authorized repurchase amount										$ 200,000
Dividends declared on preferred stock (in dollars per share)								$ 1.32	$ 1.32
Common stock, shares outstanding (in shares)								414,797,263			414,744,518
Options granted (in shares)								0
Fair value			$ 53,500
Share price (in dollars per share)								$ 11.25
Fortress-managed funds
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Common stock, shares outstanding (in shares)								2,400,000
Share-based Payment Arrangement, Nonemployee | Common stock purchase warrants
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Risk free interest rate			0.24%
Expected volatility rate			35.00%
Expected term (in years)			3 years
Options granted (in shares)		43,400,000						0
Exercise price range, lower range limit (in dollars per share)			$ 6.11
Exercise price range, upper range limit (in dollars per share)			$ 7.94
Share-based Payment Arrangement, Nonemployee | Common stock purchase warrants | Exercise Price One
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable (in shares)			24,600,000
Exercise price (in dollars per share)			$ 6.11
Share-based Payment Arrangement, Nonemployee | Common stock purchase warrants | Exercise Price Two
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Shares exercisable (in shares)			18,900,000
Exercise price (in dollars per share)			$ 7.94
7.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)								6,210,000	6,210,000
Interest rate							7.50%
Dividends declared on preferred stock (in dollars per share)	$ 0.47							$ 0.47	$ 0.47
Preferred dividends	$ 2,900
7.125% Series B Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)								11,300,000	11,300,000
Interest rate						7.125%
Dividends declared on preferred stock (in dollars per share)	$ 0.45							$ 0.45	$ 0.45
Preferred dividends	$ 5,000
6.375% Series C Preferred Stock
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)				16,100,000				16,100,000	16,100,000
Interest rate				6.375%	6.375%
Preferred stock, par values (in dollars per share)				$ 0.01
Liquidation preference per share (in dollars per share)				$ 25.00
Net proceeds from liquidation				$ 389,500
Risk free interest rate				1.55%
Expected dividend rate				9.00%
Expected volatility rate				17.39%
Expected term (in years)				10 years
Dividends declared on preferred stock (in dollars per share)	$ 0.40							$ 0.40	$ 0.40
Preferred dividends	$ 6,400
6.375% Series C Preferred Stock | Over-Allotment Option
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of shares issued (in shares)				1,600,000
6.375% Series C Preferred Stock | Share-based Payment Arrangement, Nonemployee
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Fair value of options granted to Manager				$ 1,000