INVESTMENT OPERATIONS - Schedule of Other-than-Temporary Impairments of Investments (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2016
Successor
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairments		$ (1,898)	$ (14,906)	$ (28,301)	$ (10,194)
Non-credit impairment losses recorded in other comprehensive income		(1,410)	4,842	12,503	3,302
Net impairment losses recognized in earnings		$ (3,308)	$ (10,064)	$ (15,798)	$ (6,892)
Predecessor
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairments	$ (636)
Non-credit impairment losses recorded in other comprehensive income	155
Net impairment losses recognized in earnings	$ (481)