CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - 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
Change in net unrealized gains (losses) on investments, income tax		$ (680,634)	$ 326,838
Reclassification adjustment for investment amounts included in net income, income tax		9,349	(5,094)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax		(212)	(3,652)
Change in accumulated (loss) gain - derivatives, income tax		(45)	370
Reclassification adjustment for derivative amounts included in net income, income tax		45	21
Change in postretirement benefits liability adjustment, income tax		$ 3,194	$ (2,616)
Predecessor
Change in net unrealized gains (losses) on investments, income tax	$ 259,738			$ 531,439
Reclassification adjustment for investment amounts included in net income, income tax	(2,244)			(24,387)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	(131)			1,883
Change in accumulated (loss) gain - derivatives, income tax	5			(1)
Reclassification adjustment for derivative amounts included in net income, income tax	13			622
Change in postretirement benefits liability adjustment, income tax	$ (6,475)			$ (12,013)