ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended	8 Months Ended	11 Months Ended
	Jan. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Successor
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance				$ 0	$ (1,241,134)	$ 0	$ 0
Other comprehensive income (loss) before reclassifications					1,022,377		(1,258,189)
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings		$ (2,866)	$ (4,566)	(4,566)	(2,572)		(393)
Amounts reclassified from accumulated other comprehensive income (loss)					(12,287)		17,448
Net current-period other comprehensive income (loss)					1,007,518		(1,241,134)
Ending Balance	$ 0	(233,616)			(233,616)		(1,241,134)
Successor | Unrealized Gains and Losses on Investments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance				0	(1,247,065)	0	0
Other comprehensive income (loss) before reclassifications					1,022,377		(1,264,034)
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings					(2,572)		(393)
Amounts reclassified from accumulated other comprehensive income (loss)					(12,287)		17,362
Net current-period other comprehensive income (loss)					1,007,518		(1,247,065)
Ending Balance	0	(239,547)			(239,547)		(1,247,065)
Offset of net unrealized losses in AOCI due to impact those net unrealized losses would have on certain of the Company's insurance assets and liabilities had the net unrealized losses been recognized in net income						139,300	623,000
Successor | Accumulated Gain and Loss Derivatives
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance				0	0	0	0
Other comprehensive income (loss) before reclassifications					0		(86)
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings					0		0
Amounts reclassified from accumulated other comprehensive income (loss)					0		86
Net current-period other comprehensive income (loss)					0		0
Ending Balance	0	0			0		0
Successor | Minimum Pension Liability Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance				0	5,931	0	0
Other comprehensive income (loss) before reclassifications					0		5,931
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings					0		0
Amounts reclassified from accumulated other comprehensive income (loss)					0		0
Net current-period other comprehensive income (loss)					0		5,931
Ending Balance	0	$ 5,931			$ 5,931		5,931
Predecessor
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance	1,418,076			1,884,044		1,884,044	1,884,044
Other comprehensive income (loss) before reclassifications	469,852
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	(243)
Amounts reclassified from accumulated other comprehensive income (loss)	(3,641)
Net current-period other comprehensive income (loss)	465,968
Ending Balance	1,884,044
Predecessor | Unrealized Gains and Losses on Investments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance	1,484,169			1,962,130		1,962,130	1,962,130
Other comprehensive income (loss) before reclassifications	482,370
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	(243)
Amounts reclassified from accumulated other comprehensive income (loss)	(4,166)
Net current-period other comprehensive income (loss)	477,961
Ending Balance	1,962,130
Offset of net unrealized losses in AOCI due to impact those net unrealized losses would have on certain of the Company's insurance assets and liabilities had the net unrealized losses been recognized in net income	(492,600)
Predecessor | Accumulated Gain and Loss Derivatives
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance	(82)			(50)		(50)	(50)
Other comprehensive income (loss) before reclassifications	9
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	0
Amounts reclassified from accumulated other comprehensive income (loss)	23
Net current-period other comprehensive income (loss)	32
Ending Balance	(50)
Predecessor | Minimum Pension Liability Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance	(66,011)			$ (78,036)		$ (78,036)	$ (78,036)
Other comprehensive income (loss) before reclassifications	(12,527)
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings	0
Amounts reclassified from accumulated other comprehensive income (loss)	502
Net current-period other comprehensive income (loss)	(12,025)
Ending Balance	$ (78,036)