Financial Derivatives (Schedule Of Credit Derivatives) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Credit Default Swap, Selling Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	$ (13,351)		$ (11,986)
Notional value	(48,522)	[1]	(40,216)	[1]
Credit Default Swap, Buying Protection [Member]
Credit Derivatives [Line Items]
Fair Value of Written Credit Derivatives, Net	126	[2]	(717)	[2]
Notional value	$ 4,875	[2]	$ 7,792	[2]

[1] The notional value is the maximum amount that a seller of credit 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 credit index contract may be offset against amounts due or owed on another credit index contract with the same ISDA counterparty.

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