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Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative Assets [Abstract]
Gross Amounts Recognized	$ 146,572	$ 190,634
Gross Amounts Offset in the Balance Sheet	(27,781)	(22,426)
Net Amounts Presented in the Balance Sheet	118,791	168,208
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	(17,010)	(22,458)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	(89,829)	(136,414)
Net Amount	11,952	9,336
Derivative Liabilities [Abstract]
Gross Amounts Recognized	40,900	54,078
Gross Amounts Offset in the Balance Sheet	(27,781)	(22,426)
Net Amounts Presented in the Balance Sheet	13,119	31,652
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	(2,722)	(1,565)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	(6,950)	(27,867)
Net Amount	$ 3,447	$ 2,220

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Fair value of free standing derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Excludes embedded derivatives.

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