OFFSETTING OF ASSETS AND LIABILITIES - Offsetting of Derivative Liabilities (Details) - Successor - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	$ 674,048	$ 522,225
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	674,048	522,225
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	171,384	42,382
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	5,595	1,617
Net Amount	497,069	478,226
Repurchase agreements
Gross Amounts of Recognized Liabilities	797,721	438,185
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	797,721	438,185
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	797,721	438,185
Total Liabilities
Gross Amounts of Recognized Liabilities	1,471,769	960,410
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,471,769	960,410
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	171,384	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	5,595	1,617
Net Amount	1,294,790	916,411
Total derivatives, subject to a master netting arrangement or similar arrangement
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	176,979	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	176,979	43,999
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	171,384	42,382
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	5,595	1,617
Net Amount	0	0
Free-Standing derivatives
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	176,979	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	176,979	43,999
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	171,384	42,382
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	5,595	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	497,069	478,226
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	497,069	478,226
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	497,069	478,226
Embedded derivative - Modco reinsurance treaties
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	141,301	178,362
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	141,301	178,362
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	141,301	178,362
Funds withheld derivative
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	91,267	102,378
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	91,267	102,378
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	91,267	102,378
Embedded derivative - GLWB
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	71,082	67,528
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	71,082	67,528
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	71,082	67,528
Embedded derivative - FIA
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	147,368	100,329
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	147,368	100,329
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	147,368	100,329
Embedded derivative - IUL
Offsetting of Derivative Liabilities:
Gross Amounts of Recognized Liabilities	46,051	29,629
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	46,051	29,629
Gross Amounts Not Offset in Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in Statement of Financial Position, Cash Collateral Paid	0	0
Net Amount	$ 46,051	$ 29,629