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]
Outstanding Principal	$ 2,940,040	$ 2,961,040
Carrying Value	2,952,877	2,973,829
Golden Gate Captive Insurance Company
Debt Instrument [Line Items]
Outstanding Principal	2,065,000	2,116,000
Carrying Value	$ 2,065,000	$ 2,116,000
Year-to-Date Weighted-Avg Interest Rate	4.75%	4.75%
Golden Gate I I
Debt Instrument [Line Items]
Outstanding Principal	$ 278,949	$ 278,949
Carrying Value	$ 228,275	$ 227,338
Year-to-Date Weighted-Avg Interest Rate	2.79%	1.30%
Golden Gate V
Debt Instrument [Line Items]
Outstanding Principal	$ 595,000	$ 565,000
Carrying Value	$ 657,166	$ 628,025
Year-to-Date Weighted-Avg Interest Rate	5.12%	5.12%
MONY
Debt Instrument [Line Items]
Outstanding Principal	$ 1,091	$ 1,091
Carrying Value	$ 2,436	$ 2,466
Year-to-Date Weighted-Avg Interest Rate	6.19%	6.19%