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INVESTMENTS (DETAILS) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 12,093,366	$ 12,185,973
Gross Unrealized Gains (fixed maturities)	91,542	116,538
Gross Unrealized Losses (fixed maturities)	(179,172)	(173,238)
Fair Value (fixed maturities)	12,005,736	12,129,273
Non-credit OTTI in AOCI	(839)	(889)
Cost	618,869	531,648
Gross Unrealized Gains (equities)	44,153	43,583
Gross Unrealized Losses (equities)	(3,841)	(7,524)
Fair Value (equities)	659,181	567,707
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,699,826	1,645,068
Gross Unrealized Gains (fixed maturities)	3,731	3,337
Gross Unrealized Losses (fixed maturities)	(20,448)	(28,328)
Fair Value (fixed maturities)	1,683,109	1,620,077
Non-credit OTTI in AOCI	0	0
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	958,293	1,080,601
Gross Unrealized Gains (fixed maturities)	6,242	7,383
Gross Unrealized Losses (fixed maturities)	(64,000)	(54,441)
Fair Value (fixed maturities)	900,535	1,033,543
Non-credit OTTI in AOCI	0	0
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,444,087	4,386,432
Gross Unrealized Gains (fixed maturities)	32,273	40,972
Gross Unrealized Losses (fixed maturities)	(72,408)	(66,280)
Fair Value (fixed maturities)	4,403,952	4,361,124
Non-credit OTTI in AOCI	0	0
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,114,217	2,241,581
Gross Unrealized Gains (fixed maturities)	30,038	40,762
Gross Unrealized Losses (fixed maturities)	(9,279)	(4,235)
Fair Value (fixed maturities)	2,134,976	2,278,108
Non-credit OTTI in AOCI	0	0
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,093,612	1,085,618
Gross Unrealized Gains (fixed maturities)	9,814	13,289
Gross Unrealized Losses (fixed maturities)	(3,856)	(2,019)
Fair Value (fixed maturities)	1,099,570	1,096,888
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	99,590	71,236
Gross Unrealized Gains (fixed maturities)	2,667	2,765
Gross Unrealized Losses (fixed maturities)	(983)	(915)
Fair Value (fixed maturities)	101,274	73,086
Non-credit OTTI in AOCI	(839)	(889)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,429,667	1,475,026
Gross Unrealized Gains (fixed maturities)	3,372	2,748
Gross Unrealized Losses (fixed maturities)	(5,978)	(16,188)
Fair Value (fixed maturities)	1,427,061	1,461,586
Non-credit OTTI in AOCI	0	0
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	254,074	200,411
Gross Unrealized Gains (fixed maturities)	3,405	5,282
Gross Unrealized Losses (fixed maturities)	(2,220)	(832)
Fair Value (fixed maturities)	255,259	204,861
Non-credit OTTI in AOCI	0	0
Exchange-Traded Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	495,590	416,063
Gross Unrealized Gains (equities)	44,153	43,583
Gross Unrealized Losses (equities)	(3,763)	(4,756)
Fair Value (equities)	535,980	454,890
Bond Mutual Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	123,279	115,585
Gross Unrealized Gains (equities)	0	0
Gross Unrealized Losses (equities)	(78)	(2,768)
Fair Value (equities)	$ 123,201	$ 112,817

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