MONY CLOSED BLOCK OF BUSINESS (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Entity Information [Line Items]
Policyholder dividend obligation			$ 13,429	$ 197,450
Deferred tax benefit			2,820	69,107
Closed block liabilities
Future policy benefits, policyholders' account balances and other policyholder liabilities					$ 5,791,867	$ 5,896,355
Policyholder dividend obligation		$ 0	31,932	0	160,712	31,932
Other liabilities					30,764	40,007
Total closed block liabilities					5,983,343	5,968,294
Closed block assets
Fixed maturities, available-for-sale, at fair value					4,669,856	4,440,105
Mortgage loans on real estate					108,934	201,088
Policy loans					700,769	712,959
Cash and other invested assets					31,182	108,270
Other assets					122,637	135,794
Total closed block assets					5,633,378	5,598,216
Excess of reported closed block liabilities over closed block assets					349,965	370,078
Portion of above representing accumulated other comprehensive income:
Net unrealized investments gains (losses) net of policyholder dividend obligation: $(13,429) and $(197,450); and net of income tax: $2,820 and $69,107						0
Future earnings to be recognized from closed block assets and closed block liabilities					$ 349,965	$ 370,078
Reconciliation of the policyholder dividend obligation
Policyholder dividend obligation, beginning balance			31,932	0
Applicable to net revenue (losses)			(55,241)	(46,557)
Change in net unrealized investment gains (losses) allocated to policyholder dividend obligation			184,021	78,489
Policyholder dividend obligation, ending balance		0	160,712	31,932
Revenues
Premiums and other income		185,562	180,097	189,700
Net investment income		193,203	203,964	211,175
Net investment gains		3,333	910	1,524
Total revenues		382,098	384,971	402,399
Benefits and other deductions
Benefits and settlement expenses		336,629	335,200	353,488
Other operating expenses		1,001	1,940	2,804
Total benefits and other deductions		337,630	337,140	356,292
Net revenues before income taxes		44,468	47,831	46,107
Income tax expense		14,920	27,718	16,137
Net revenues		$ 29,548	$ 20,113	$ 29,970
Predecessor
Revenues
Premiums and other income	$ 15,065
Net investment income	19,107
Net investment gains	568
Total revenues	34,740
Benefits and other deductions
Benefits and settlement expenses	31,152
Other operating expenses	0
Total benefits and other deductions	31,152
Net revenues before income taxes	3,588
Income tax expense	1,256
Net revenues	$ 2,332