CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - 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 income		$ 268,299	$ 1,106,532	$ 393,029
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (Successor 2017 - $329,801; 2016 - $326,838; 2015 - $(680,634)); (Predecessor 2015 - $259,738)		(1,264,034)	700,536	606,985
Reclassification adjustment for investment amounts included in net income, net of income tax: (Successor 2017 - $489; 2016 - $(5,094); 2015 - $9,349); (Predecessor 2015 - $(2,244))		17,362	642	(9,460)
Change in net unrealized (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (Successor 2017 - $3,858; 2016 - $(3,652); 2015 - $(212)); (Predecessor 2015 - $(131))		(393)	7,153	(6,782)
Change in accumulated (loss) gain—derivatives, net of income tax: (Successor 2017 - $(303); 2016 - $370; 2015 - $(45)); (Predecessor 2015 - $5)		(86)	(563)	688
Reclassification adjustment for derivative amounts included in net income, net of income tax: (Successor 2017 - $243; 2016 - $21; 2015 - $45); (Predecessor 2015 - $13)		86	451	39
Change in postretirement benefits liability adjustment, net of income tax: (Successor 2017 - $(4,047); 2016 - $(2,616); 2015 - $3,194); (Predecessor 2015 - $(6,475))		5,931	(15,225)	(4,859)
Total other comprehensive income (loss)		(1,241,134)	692,994	586,611
Total comprehensive income (loss)		$ (972,835)	$ 1,799,526	$ 979,640
Predecessor
Net income	$ 1,509
Other comprehensive income (loss):
Change in net unrealized gains (losses) on investments, net of income tax: (Successor 2017 - $329,801; 2016 - $326,838; 2015 - $(680,634)); (Predecessor 2015 - $259,738)	482,370
Reclassification adjustment for investment amounts included in net income, net of income tax: (Successor 2017 - $489; 2016 - $(5,094); 2015 - $9,349); (Predecessor 2015 - $(2,244))	(4,166)
Change in net unrealized (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (Successor 2017 - $3,858; 2016 - $(3,652); 2015 - $(212)); (Predecessor 2015 - $(131))	(243)
Change in accumulated (loss) gain—derivatives, net of income tax: (Successor 2017 - $(303); 2016 - $370; 2015 - $(45)); (Predecessor 2015 - $5)	9
Reclassification adjustment for derivative amounts included in net income, net of income tax: (Successor 2017 - $243; 2016 - $21; 2015 - $45); (Predecessor 2015 - $13)	23
Change in postretirement benefits liability adjustment, net of income tax: (Successor 2017 - $(4,047); 2016 - $(2,616); 2015 - $3,194); (Predecessor 2015 - $(6,475))	(12,025)
Total other comprehensive income (loss)	465,968
Total comprehensive income (loss)	$ 467,477