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Net Investment Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income (Losses) from Investment Funds	$ 137,941	$ 158,718
Investment expense	(2,012)	(1,099)
Net investment income	135,929	157,619	586,763	526,351	530,525
Fixed Maturity Securities, Including Cash [Member]
Income (Losses) from Investment Funds	117,836	119,288
Investment Funds [Member]
Income (Losses) from Investment Funds	10,934	27,623
Arbitrage Trading Account and Funds [Member]
Income (Losses) from Investment Funds	3,783	6,481
Equity Securities Available For Sale [Member]
Income (Losses) from Investment Funds	2,247	3,150
Real Estate [Member]
Income (Losses) from Investment Funds	$ 3,141	$ 2,176

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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