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Derivative Instruments (Exposure from Credit Derivatives by NAIC Rating of the Underlying Credits) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Credit Derivatives [Line Items]
Notional	$ 315,000	$ 369,000
Fair value	$ 1,125	$ 1,640

Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative.

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