DERIVATIVE FINANCIAL INSTRUMENTS - Realized Investment Gains and Losses for the Modco Trading Portfolio that is Included in Realized Investment Gains (Losses) - All Other Investments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jan. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2016
Successor
Realized investment gains (losses) - all other investments
Modco trading portfolio		$ 76,201	$ (108,741)	$ (141,901)	$ 154,355
Predecessor
Realized investment gains (losses) - all other investments
Modco trading portfolio	$ 73,062