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Derivatives (Summary of Derivative Gain Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Fair Value of Derivative Instruments, Not Designated as Hedging Instruments	$ 22,405
Derivative Instruments, Gain Recognized in Income	$ (26,542)

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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