DEBT AND OTHER OBLIGATIONS - Non-Recourse Funding Obligations (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Non-recourse funding obligations, outstanding principal	$ 2,719,691	$ 2,740,691
Non-recourse funding obligations, carrying value	2,774,744	2,796,474
Golden Gate Captive Insurance Company
Debt Instrument [Line Items]
Non-recourse funding obligations, outstanding principal	2,065,000	2,116,000
Non-recourse funding obligations, carrying value	$ 2,065,000	$ 2,116,000
Non-recourse funding obligation, year-to-date weighted-average interest rate	4.75%	4.75%
Golden Gate II Captive Insurance Company
Debt Instrument [Line Items]
Non-recourse funding obligations, outstanding principal	$ 58,600	$ 58,600
Non-recourse funding obligations, carrying value	$ 50,142	$ 49,983
Non-recourse funding obligation, year-to-date weighted-average interest rate	3.72%	2.52%
Golden Gate V Vermont Captive Insurance Company
Debt Instrument [Line Items]
Non-recourse funding obligations, outstanding principal	$ 595,000	$ 565,000
Non-recourse funding obligations, carrying value	$ 657,166	$ 628,025
Non-recourse funding obligation, year-to-date weighted-average interest rate	5.12%	5.12%
MONY Life Insurance Company
Debt Instrument [Line Items]
Non-recourse funding obligations, outstanding principal	$ 1,091	$ 1,091
Non-recourse funding obligations, carrying value	$ 2,436	$ 2,466
Non-recourse funding obligation, year-to-date weighted-average interest rate	6.19%	6.19%