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Derivatives (Narrative) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
Derivatives (Narrative) (Details) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010 Interest Rate Swaps [Member]	Sep. 30, 2010 Interest Rate Swaps [Member]
Derivatives designated as hedging instruments	no	no
Pre-tax losses on derivatives			$ 332	$ 4,088