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	$ 1,069,011	$ 629,555
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,069,011	629,555
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	939,271	585,556
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	1,288,468	1,067,740
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,288,468	1,067,740
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	1,158,728	1,023,741
Total derivatives, subject to a master netting arrangement or similar arrangement
Offsetting of Derivative Liabilities
Gross Amounts of Recognized 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
Gross Amounts of Recognized 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	939,271	585,556
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	939,271	585,556
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	939,271	585,556
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
Embedded derivative - GMWB
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	496,987	277,236
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	496,987	277,236
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	496,987	277,236
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