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INVESTMENTS (DETAILS) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 12,217,258	$ 12,185,973
Gross Unrealized Gains (fixed maturities)	100,795	116,538
Gross Unrealized Losses (fixed maturities)	(178,458)	(173,238)
Fair Value (fixed maturities)	12,139,595	12,129,273
Non-credit OTTI in AOCI	(886)	(889)
Cost	685,462	531,648
Gross Unrealized Gains (equities)	21,835	43,583
Gross Unrealized Losses (equities)	(18,140)	(7,524)
Fair Value (equities)	689,157	567,707
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,867,800	1,645,068
Gross Unrealized Gains (fixed maturities)	9,517	3,337
Gross Unrealized Losses (fixed maturities)	(12,859)	(28,328)
Fair Value (fixed maturities)	1,864,458	1,620,077
Non-credit OTTI in AOCI	0	0
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	835,965	1,080,601
Gross Unrealized Gains (fixed maturities)	3,888	7,383
Gross Unrealized Losses (fixed maturities)	(67,139)	(54,441)
Fair Value (fixed maturities)	772,714	1,033,543
Non-credit OTTI in AOCI	0	0
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,540,189	4,386,432
Gross Unrealized Gains (fixed maturities)	29,437	40,972
Gross Unrealized Losses (fixed maturities)	(77,543)	(66,280)
Fair Value (fixed maturities)	4,492,083	4,361,124
Non-credit OTTI in AOCI	0	0
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,172,782	2,241,581
Gross Unrealized Gains (fixed maturities)	38,239	40,762
Gross Unrealized Losses (fixed maturities)	(3,313)	(4,235)
Fair Value (fixed maturities)	2,207,708	2,278,108
Non-credit OTTI in AOCI	0	0
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,069,887	1,085,618
Gross Unrealized Gains (fixed maturities)	11,623	13,289
Gross Unrealized Losses (fixed maturities)	(3,651)	(2,019)
Fair Value (fixed maturities)	1,077,859	1,096,888
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	103,180	71,236
Gross Unrealized Gains (fixed maturities)	2,173	2,765
Gross Unrealized Losses (fixed maturities)	(1,456)	(915)
Fair Value (fixed maturities)	103,897	73,086
Non-credit OTTI in AOCI	(886)	(889)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,448,536	1,475,026
Gross Unrealized Gains (fixed maturities)	2,138	2,748
Gross Unrealized Losses (fixed maturities)	(11,451)	(16,188)
Fair Value (fixed maturities)	1,439,223	1,461,586
Non-credit OTTI in AOCI	0	0
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	178,919	200,411
Gross Unrealized Gains (fixed maturities)	3,780	5,282
Gross Unrealized Losses (fixed maturities)	(1,046)	(832)
Fair Value (fixed maturities)	181,653	204,861
Non-credit OTTI in AOCI	0	0
Exchange-Traded Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	563,262	416,063
Gross Unrealized Gains (equities)	21,835	43,583
Gross Unrealized Losses (equities)	(17,704)	(4,756)
Fair Value (equities)	567,393	454,890
Bond Mutual Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	122,200	115,585
Gross Unrealized Gains (equities)	0	0
Gross Unrealized Losses (equities)	(436)	(2,768)
Fair Value (equities)	$ 121,764	$ 112,817

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