DEBT AND OTHER OBLIGATIONS - Non-Recourse Funding Obligations Outstanding (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Outstanding Principal	$ 1,885	$ 3,079,834
Carrying value	2,197	3,082,753
Golden Gate Captive Insurance Company (Golden Gate)
Debt Instrument [Line Items]
Outstanding Principal		2,028,000
Carrying value		$ 2,028,000
Year-to-Date Interest Rate		4.70%
Golden Gate II Captive Insurance Company (Golden Gate II)
Debt Instrument [Line Items]
Outstanding Principal		$ 329,949
Carrying value		$ 274,955
Year-to-Date Interest Rate		5.06%
Golden Gate V Vermont Captive Insurance Company (Golden Gate V)
Debt Instrument [Line Items]
Outstanding Principal		$ 720,000
Carrying value		$ 777,527
Year-to-Date Interest Rate		5.12%
MONY Life Insurance Company
Debt Instrument [Line Items]
Outstanding Principal	1,885	$ 1,885
Carrying value	$ 2,197	$ 2,271
Year-to-Date Interest Rate	6.19%	6.19%