MONY CLOSED BLOCK OF BUSINESS - Summary of Financial Information of the Policyholder Dividend Obligation (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Closed block liabilities
Future policy benefits, policyholders’ account balances and other policyholder liabilities	$ 5,837,388	$ 5,896,355
Policyholder dividend obligation	123,449	31,932	$ 232,422	$ 0
Other liabilities	18,662	40,007
Total closed block liabilities	5,979,499	5,968,294
Closed block assets
Fixed maturities, available-for-sale, at fair value	4,568,414	4,440,105
Mortgage loans on real estate	153,106	201,088
Policy loans	709,618	712,959
Cash	52,863	108,270
Other assets	139,948	135,794
Total closed block assets	5,623,949	5,598,216
Excess of reported closed block liabilities over closed block assets	355,550	370,078
Portion of above representing accumulated other comprehensive income:
Net unrealized investment gains (losses) net of policyholder dividend obligation: $(80,032) and $(197,450); and net of income tax: $28,011 and $69,107	0	0
Future earnings to be recognized from closed block assets and closed block liabilities	355,550	370,078
Net unrealized investment gains (losses) allocated to policyholder dividend obligation, net of deferred tax benefits	(80,032)	(197,450)
Net unrealized investment gains (losses), income tax	$ 28,011	$ 69,107