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Net Investment Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income (Losses) from Investment Funds	$ 158,718	$ 146,979
Investment expense	(1,099)	(853)
Net investment income	157,619	146,126
Fixed Maturity Securities, Including Cash [Member]
Income (Losses) from Investment Funds	119,288	120,941
Investment Funds [Member]
Income (Losses) from Investment Funds	27,623	16,387
Arbitrage Trading Account and Funds [Member]
Income (Losses) from Investment Funds	6,481	5,215
Equity Securities Available For Sale [Member]
Income (Losses) from Investment Funds	3,150	3,264
Real Estate [Member]
Income (Losses) from Investment Funds	$ 2,176	$ 1,172

Income derived from investments in debt and equity securities and on cash and cash equivalents. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies.

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