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Net Investment Income (Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gross investment income	$ 592,852	$ 529,820	$ 534,085
Investment expense	(6,089)	(3,469)	(3,560)
Net investment income	586,763	526,351	530,525
Fixed maturity securities, including cash and cash equivalents and loans receivable [Member]
Gross investment income	479,035	483,905	501,750
Equity Securities available for sale [Member]
Gross investment income	16,419	12,416	11,661
Investment funds [Member]
Gross investment income	77,015	9,452	(6,481)
Arbitrage trading account [Member]
Gross investment income	8,286	16,576	27,155
Real Estate [Domain]
Gross investment income	$ 12,097	$ 7,471	$ 0

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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