Financial Derivatives (Schedule Of Credit Derivatives) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	$ (16,172)		$ (9,548)
Derivative Notional	(56,505)	[1]	(22,615)	[1]
Credit Default Swap, Buying Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	2,881	[2]	0	[2]
Derivative Notional	$ 24,685	[2]	$ 0	[2]

[1] The notional value is the maximum amount that a seller of ABS indices would be obligated to pay, and a buyer of credit protection would receive upon occurrence of a "credit event." Movements in the value of credit default swap transactions may require the Company or the counterparty to post or receive collateral. Amounts due or owed under an ABS index contract may be offset against amounts due or owed on another ABS index contract with the same ISDA counterparty.

[2] Offsetting transactions with third parties include purchased credit derivatives which have the same reference obligation.