MONY CLOSED BLOCK OF BUSINESS - Summary of Financial Information for the Closed Block (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Closed block liabilities
Future policy benefits, policyholders’ account balances and other policyholder liabilities	$ 5,679,732	$ 5,791,867
Policyholder dividend obligation	0	160,712	$ 31,932
Other liabilities	22,505	30,764
Total closed block liabilities	5,702,237	5,983,343
Closed block assets
Fixed maturities, available-for-sale, at fair value	4,257,437	4,669,856
Mortgage loans on real estate	75,838	108,934
Policy loans	672,213	700,769
Cash and other invested assets	116,225	31,182
Other assets	136,388	122,637
Total closed block assets	5,258,101	5,633,378
Excess of reported closed block liabilities over closed block assets	444,136	349,965
Portion of above representing accumulated other comprehensive income:
Net unrealized investments gains (losses) net of policyholder dividend obligation: $(141,128) and $(13,429); and net of income tax: $61,676 and $2,820	(120,528)	0
Future earnings to be recognized from closed block assets and closed block liabilities	323,608	349,965
Policyholder dividend obligations	(141,128)	(13,429)
Policyholder dividend obligation, deferred income tax	$ 61,676	$ 2,820