OFFSETTING OF ASSETS AND LIABILITIES - Schedule of Derivative Instruments by Liabilities (Details) - Successor - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	$ 846,911	$ 522,225
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	846,911	522,225
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	114,968	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	14,772	1,617
Net Amount	717,171	478,226
Repurchase agreements
Gross Amounts of Recognized Liabilities	219,457	438,185
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	219,457	438,185
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	219,457	438,185
Total Liabilities
Gross Amounts of Recognized Liabilities	1,066,368	960,410
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,066,368	960,410
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	114,968	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	14,772	1,617
Net Amount	936,628	916,411
Total derivatives, subject to a master netting arrangement or similar arrangement
Offsetting of Derivative Liabilities:
Fair Value, Other Liabilities	129,740	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	129,740	43,999
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	114,968	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	14,772	1,617
Net Amount	0	0
Free-Standing derivatives
Offsetting of Derivative Liabilities:
Fair Value, Other Liabilities	129,740	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	129,740	43,999
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	114,968	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	14,772	1,617
Net Amount	0	0
Total derivatives, not subject to a master netting arrangement or similar arrangement
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	717,171	478,226
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	717,171	478,226
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	717,171	478,226
Embedded derivative - Modco reinsurance treaties
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	254,285	178,362
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	254,285	178,362
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	254,285	178,362
Funds withheld derivative
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	112,344	102,378
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	112,344	102,378
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	112,344	102,378
Embedded derivative - GMWB
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	162,543	67,528
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	162,543	67,528
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	162,543	67,528
Embedded derivative - FIA
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	141,651	100,329
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	141,651	100,329
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	141,651	100,329
Embedded derivative - IUL
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	46,348	29,629
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	46,348	29,629
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	$ 46,348	$ 29,629