DERIVATIVE FINANCIAL INSTRUMENTS - Realized Investment Gains (Losses), All Other Investments (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2014
Successor
Derivative Instruments, Gain (Loss) [Line Items]
Realized investment gains (losses)		$ (167,359)	$ 67,583
Predecessor
Derivative Instruments, Gain (Loss) [Line Items]
Realized investment gains (losses)	$ 73,062			$ 142,016
Modco trading portfolio | Successor
Derivative Instruments, Gain (Loss) [Line Items]
Realized investment gains (losses)		$ (167,359)	$ 67,583
Modco trading portfolio | Predecessor
Derivative Instruments, Gain (Loss) [Line Items]
Realized investment gains (losses)	$ 73,062			$ 142,016