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Derivative Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments [Abstract]
Realized gain (loss) on derivative instruments, net	$ 11,133	$ 10,007
Unrealized gain (loss) on derivative instruments, net	(8,095)	(10,194)
Gain (loss) on derivative instruments, net	$ 3,038	$ (187)

The amount of net gains and losses 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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