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Investments (Details 20) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Derivative Assets [Abstract]
Derivative Fair Value Of Derivative Asset	$ 175,236,000	$ 190,634,000
Derivative Asset Fair Value Gross Liability	(23,475,000)	(22,426,000)
Derivative Assets	151,761,000	168,208,000
Derivative Asset Fair Value Of Collateral	(17,664,000)	(22,458,000)
Derivative Collateral Obligation To Return Cash	(126,329,000)	(136,414,000)
Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral	7,768,000	9,336,000
Derivative Liabilities [Abstract]
Derivative Fair Value Of Free Standing Derivative Liability	42,079,000	54,078,000
Derivative Liability Fair Value Gross Asset	(23,475,000)	(22,426,000)
Derivative Liabilities	18,604,000	31,652,000
Derivative Liability Fair Value Of Collateral	(14,118,000)	(1,565,000)
Derivative Collateral Right To Reclaim Cash	(6,250,000)	(27,867,000)
Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral	$ (1,764,000)	$ 2,220,000

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