EQUITY AND EARNINGS PER SHARE - Schedule of Preferred Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands				1 Months Ended				12 Months Ended
	Dec. 15, 2021	Sep. 14, 2021	Feb. 14, 2020	Sep. 30, 2021	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Number of common shares (in shares)								52,210	33,610
Preferred stock, aggregate liquidation preference								$ 1,305,250	$ 840,250
Carrying Value								$ 1,262,481
Preferred stock, dividends (in dollars per share)								$ 5.97	$ 5.26	$ 2.05
Preferred stock, liquidation preference per share (in dollars per share)								$ 25.00
7.50% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Number of common shares (in shares)								6,210	6,210
Preferred stock, aggregate liquidation preference								$ 155,250	$ 155,250
Issuance Discount								3.15%
Carrying Value								$ 150,026
Preferred stock, dividends (in dollars per share)	$ 0.47							$ 1.88	$ 1.88	1.16
Dividend interest rate							7.50%
7.125% Series B Preferred Stock
Class of Stock [Line Items]
Number of common shares (in shares)								11,300	11,300
Preferred stock, aggregate liquidation preference								$ 282,500	$ 282,500
Issuance Discount								3.15%
Carrying Value								$ 273,418
Preferred stock, dividends (in dollars per share)	0.45							$ 1.78	$ 1.78	0.89
Dividend interest rate						7.125%
6.375% Series C Preferred Stock
Class of Stock [Line Items]
Number of common shares (in shares)								16,100	16,100
Preferred stock, aggregate liquidation preference								$ 402,500	$ 402,500
Issuance Discount								3.15%
Carrying Value								$ 389,548
Preferred stock, dividends (in dollars per share)	0.40							$ 1.59	$ 1.60	0
Dividend interest rate			6.375%		6.375%
Preferred stock, liquidation preference per share (in dollars per share)			$ 25.00
7.00% Series D Preferred Stock
Class of Stock [Line Items]
Number of common shares (in shares)								18,600	0
Preferred stock, aggregate liquidation preference								$ 465,000	$ 0
Issuance Discount								3.15%
Carrying Value								$ 449,489
Preferred stock, dividends (in dollars per share)	$ 0.44							$ 0.72	$ 0	$ 0
Dividend interest rate		7.00%		7.00%
Preferred stock, liquidation preference per share (in dollars per share)		$ 25.00