MONY CLOSED BLOCK OF BUSINESS - Summary of Financial Information for the Closed Block (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Closed block liabilities
Future policy benefits, policyholders’ account balances and other policyholder liabilities	$ 5,868,104	$ 5,896,355
Policyholder dividend obligation	41,180	31,932	$ 96,508	$ 0
Other liabilities	46,257	40,007
Total closed block liabilities	5,955,541	5,968,294
Closed block assets
Fixed maturities, available-for-sale, at fair value	4,508,439	4,440,105
Mortgage loans on real estate	196,295	201,088
Policy loans	705,640	712,959
Cash	47,203	108,270
Other assets	136,975	135,794
Total closed block assets	5,594,552	5,598,216
Excess of reported closed block liabilities over closed block assets	360,989	370,078
Portion of above representing accumulated other comprehensive income:
Net unrealized investment gains (losses) net of policyholder dividend obligation: $(171,450) and $(197,450); and net of income tax: $60,008 and $69,107	0	0
Future earnings to be recognized from closed block assets and closed block liabilities	360,989	370,078
Policyholder dividend obligation	(171,450)	(197,450)
Income tax	$ 60,008	$ 69,107