OFFSETTING OF ASSETS AND LIABILITIES - Schedule of Derivative Instruments by Liabilities (Details) - Successor - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 858,429	$ 629,555
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	858,429	629,555
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	37,967	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	18,681	1,617
Net Amount	801,781	585,556
Repurchase agreements
Gross Amounts of Recognized Liabilities	660,000	438,185
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	660,000	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	660,000	438,185
Total Liabilities
Gross Amounts of Recognized Liabilities	1,518,429	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	1,518,429	1,067,740
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	37,967	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	18,681	1,617
Net Amount	1,461,781	1,023,741
Total derivatives, subject to a master netting arrangement or similar arrangement
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	56,648	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	56,648	43,999
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	37,967	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	18,681	1,617
Net Amount	0	0
Free-Standing derivatives
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	56,648	43,999
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	56,648	43,999
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	37,967	42,382
Gross Amounts Not Offset in the Statement of Financial Position, Cash Collateral Paid	18,681	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	801,781	585,556
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	801,781	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	801,781	585,556
Embedded derivative - Modco reinsurance treaties
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	226,344	178,362
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	226,344	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	226,344	178,362
Embedded derivative - GMWB
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	423,888	277,236
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	423,888	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	423,888	277,236
Embedded derivative - FIA
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	113,552	100,329
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	113,552	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	113,552	100,329
Embedded derivative - IUL
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	37,997	29,629
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	37,997	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	$ 37,997	$ 29,629