INVESTMENT OPERATIONS - Schedule of Investment Gains (Losses) for All Other Investments (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Net realized gains (losses) for all other investments
Fixed maturities		$ 1,272	$ 12,783	$ 32,183
Equity securities		(1,001)	(2,330)	92
Impairments on securities		(26,993)	(9,112)	(17,748)
Modco trading portfolio		(167,359)	119,206	67,583
Other investments		153	(8,572)	(9,228)
Total realized gains (losses) - investments		$ (193,928)	$ 111,975	$ 72,882
Predecessor
Net realized gains (losses) for all other investments
Fixed maturities	$ 6,891
Equity securities	0
Impairments on securities	(481)
Modco trading portfolio	73,062
Other investments	1,200
Total realized gains (losses) - investments	$ 80,672