INVESTMENT OPERATIONS - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Fixed Maturities, by Expected Maturity (Details) - Successor - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Held-to-maturity, Fair Value
Fair Value	$ 2,894,615	$ 515,000
Fixed maturities
Available-for-sale, Amortized Cost
Due in one year or less	786,505
Due after one year through five years	6,834,174
Due after five years through ten years	7,735,392
Due after ten years	21,447,825
Total	36,803,896
Available-for-sale, Fair Value
Due in one year or less	787,980
Due after one year through five years	6,901,114
Due after five years through ten years	7,887,064
Due after ten years	21,070,465
Total	36,646,623
Held-to-maturity, Amortized Cost
Due after ten years	2,775,230
Amortized Cost	2,775,230	593,314
Held-to-maturity, Fair Value
Due after ten years	2,894,615
Fair Value	$ 2,894,615	$ 515,000