EQUITY AND EARNINGS PER SHARE - Schedule of Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended			3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 23, 2020	Feb. 14, 2020	Aug. 15, 2019	Jul. 02, 2019	Feb. 29, 2020	Aug. 31, 2019	Jul. 31, 2019	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Number of shares issued (in shares)										33,610,000
Liquidation Preference								$ 840,250		$ 840,250
Carrying Value								812,992		812,992
7.50% Series A Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)				6,200,000			6,210,000
Liquidation Preference							$ 155,250
Issuance Discount							3.15%
Carrying Value								$ 150,026		$ 150,026
Dividends (in dollars per share)	$ 0.47							$ 0.47		$ 1,410
Interest rate				7.50%			7.50%			7.50%	7.50%
7.125% Series B Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)			11,300,000			11,300,000
Liquidation Preference						$ 282,500
Issuance Discount						3.15%
Carrying Value								$ 273,418		$ 273,418
Dividends (in dollars per share)	0.45							$ 0.45		$ 1,340
Interest rate			7.125%			7.125%			7.125%	7.125%
6.375% Series C Preferred Stock
Class of Stock [Line Items]
Number of shares issued (in shares)		16,100,000			16,100,000
Liquidation Preference					$ 402,500
Issuance Discount					3.15%
Carrying Value								$ 389,548		$ 389,548
Dividends (in dollars per share)	$ 0.40							$ 0.40		$ 1,200
Interest rate		6.375%			6.375%				6.375%	6.375%