EQUITY AND EARNINGS PER SHARE - Schedule of Preferred Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 16, 2021	Feb. 14, 2020	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Number of shares issued (in shares)								33,610	33,610
Liquidation preference						$ 840,250		$ 840,250		$ 840,250
Carrying Value						$ 812,992		$ 812,992
Dividends (in dollars per share)						$ 1.32	$ 1.32	$ 2.63	$ 2.63
Liquidation preference per share (in dollars per share)							25.00		$ 25.00
7.50% Series A Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)								6,210	6,210
Liquidation preference						$ 155,250		$ 155,250
Issuance Discount								3.15%
Carrying Value						$ 150,026		$ 150,026
Dividends (in dollars per share)	$ 0.47					$ 0.47	0.47	$ 0.94	$ 0.94
Interest rate					7.50%
7.125% Series B Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)								11,300	11,300
Liquidation preference						$ 282,500		$ 282,500
Issuance Discount								3.15%
Carrying Value						$ 273,418		$ 273,418
Dividends (in dollars per share)	0.45					$ 0.45	0.45	$ 0.89	$ 0.89
Interest rate				7.125%
6.375% Series C Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)								16,100	16,100
Liquidation preference						$ 402,500		$ 402,500
Issuance Discount								3.15%
Carrying Value						$ 389,548		$ 389,548
Dividends (in dollars per share)	$ 0.40					$ 0.40	$ 0.40	$ 0.80	$ 0.80
Interest rate		6.375%	6.375%
Liquidation preference per share (in dollars per share)		$ 25.00