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INVESTMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 12,023,304	$ 11,987,146
Gross Unrealized Gains (fixed maturities)	186,242	179,218
Gross Unrealized Losses (fixed maturities)	(113,707)	(180,037)
Fair Value (fixed maturities)	12,095,839	11,986,327
Non-credit OTTI in AOCI	(863)	(868)
Cost	581,473	566,219
Gross Unrealized Gains (equities)	132,502	141,951
Gross Unrealized Losses (equities)	(5,563)	(6,183)
Fair Value (equities)	708,412	701,987
US Government and Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,705,581	1,421,245
Gross Unrealized Gains (fixed maturities)	2,686	1,405
Gross Unrealized Losses (fixed maturities)	(24,265)	(33,952)
Fair Value (fixed maturities)	1,684,002	1,388,698
Non-credit OTTI in AOCI	0	0
Non-US Government [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,242,736	1,208,384
Gross Unrealized Gains (fixed maturities)	20,130	17,990
Gross Unrealized Losses (fixed maturities)	(33,060)	(49,992)
Fair Value (fixed maturities)	1,229,806	1,176,382
Non-credit OTTI in AOCI	0	0
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	3,757,948	3,533,585
Gross Unrealized Gains (fixed maturities)	84,688	84,881
Gross Unrealized Losses (fixed maturities)	(7,071)	(10,228)
Fair Value (fixed maturities)	3,835,565	3,608,238
Non-credit OTTI in AOCI	0	0
Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,371,868	2,485,139
Gross Unrealized Gains (fixed maturities)	24,849	21,979
Gross Unrealized Losses (fixed maturities)	(31,959)	(58,291)
Fair Value (fixed maturities)	2,364,758	2,448,827
Non-credit OTTI in AOCI	0	0
CMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	849,279	790,095
Gross Unrealized Gains (fixed maturities)	12,523	11,285
Gross Unrealized Losses (fixed maturities)	(2,207)	(3,966)
Fair Value (fixed maturities)	859,595	797,414
Non-credit OTTI in AOCI	0	0
Non-Agency RMBS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	95,261	65,590
Gross Unrealized Gains (fixed maturities)	4,682	2,375
Gross Unrealized Losses (fixed maturities)	(454)	(398)
Fair Value (fixed maturities)	99,489	67,567
Non-credit OTTI in AOCI	(863)	(868)
ABS [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	968,942	955,274
Gross Unrealized Gains (fixed maturities)	4,057	6,871
Gross Unrealized Losses (fixed maturities)	(9,453)	(8,694)
Fair Value (fixed maturities)	963,546	953,451
Non-credit OTTI in AOCI	0	0
Municipals [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,031,689	1,527,834
Gross Unrealized Gains (fixed maturities)	32,627	32,432
Gross Unrealized Losses (fixed maturities)	(5,238)	(14,516)
Fair Value (fixed maturities)	1,059,078	1,545,750
Non-credit OTTI in AOCI	0	0
Common Stock [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	346,254	345,759
Gross Unrealized Gains (equities)	87,482	98,742
Gross Unrealized Losses (equities)	(5,502)	(6,183)
Fair Value (equities)	428,234	438,318
Exchange-Traded Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	120,467	106,762
Gross Unrealized Gains (equities)	33,453	32,085
Gross Unrealized Losses (equities)	(61)	0
Fair Value (equities)	153,859	138,847
Non-U.S. Bond Mutual Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost	114,752	113,698
Gross Unrealized Gains (equities)	11,567	11,124
Gross Unrealized Losses (equities)	0	0
Fair Value (equities)	$ 126,319	$ 124,822

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security.

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