ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $)	2 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Jan. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Other comprehensive income (loss) before reclassifications	$ (292,256,000)
Amounts reclassified from accumulated other comprehensive income (loss)	(183,000)
Total other comprehensive income (loss)	(292,439,000)
Ending Balance	(292,439,000)
Unrealized gains and losses on available-for-sale securities
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Other comprehensive income (loss) before reclassifications	(292,233,000)
Amounts reclassified from accumulated other comprehensive income (loss)	(242,000)
Total other comprehensive income (loss)	(292,475,000)
Ending Balance	(292,475,000)
Impact of DAC and VOBA	10,700,000	(512,100,000)		(397,500,000)
Gains and losses on derivative instruments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Other comprehensive income (loss) before reclassifications	(23,000)
Amounts reclassified from accumulated other comprehensive income (loss)	59,000
Total other comprehensive income (loss)	36,000
Ending Balance	36,000
Predecessor
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance		1,418,076,000	494,066,000	494,066,000
Other comprehensive income (loss) before reclassifications		469,852,000		959,561,000
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings		(243,000)	4,511,000	3,498,000
Amounts reclassified from accumulated other comprehensive income (loss)		(3,641,000)		(39,049,000)
Total other comprehensive income (loss)		465,968,000	482,698,000	924,010,000
Ending Balance		1,884,044,000		1,418,076,000
Predecessor | Unrealized gains and losses on available-for-sale securities
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance		1,484,169,000	539,003,000	539,003,000
Other comprehensive income (loss) before reclassifications		482,370,000		986,958,000
Other comprehensive income (loss) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings		(243,000)		3,498,000
Amounts reclassified from accumulated other comprehensive income (loss)		(4,166,000)		(45,290,000)
Total other comprehensive income (loss)		477,961,000		945,166,000
Ending Balance		1,962,130,000		1,484,169,000
Impact of DAC and VOBA				(397,500,000)	(198,100,000)
Predecessor | Gains and losses on derivative instruments
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance		(82,000)	(1,235,000)	(1,235,000)
Other comprehensive income (loss) before reclassifications		9,000		(2,000)
Amounts reclassified from accumulated other comprehensive income (loss)		23,000		1,155,000
Total other comprehensive income (loss)		32,000		1,153,000
Ending Balance		(50,000)		(82,000)
Predecessor | Minimum Pension Liability Adjustment
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Beginning Balance		(66,011,000)	(43,702,000)	(43,702,000)
Other comprehensive income (loss) before reclassifications		(12,527,000)		(27,395,000)
Amounts reclassified from accumulated other comprehensive income (loss)		502,000		5,086,000
Total other comprehensive income (loss)		(12,025,000)		(22,309,000)
Ending Balance		$ (78,036,000)		$ (66,011,000)