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Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments [Member]
Assets
Investments	$ 3,176,297	$ 3,180,095
Interest Rate Swap [Member]
Liabilities
Interest rate swap agreements	0	103
Secured Notes [Member]
Liabilities
Secured notes payable	140,000	140,000
Equity Contract [Member]
Liabilities
Equity contracts	$ 331	$ 175

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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