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	2 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2016
Successor
Realized investment gains (losses) - all other investments
Modco trading portfolio		$ (33,160)	$ 78,154
Predecessor
Realized investment gains (losses) - all other investments
Modco trading portfolio	$ 73,062