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Derivative Instruments (Schedule Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized gain (loss) on derivative instruments, net	$ 1,313	$ 9,450	$ 9,320	$ 30,544
Unrealized gain (loss) on derivative instruments, net	(28,971)	(24,168)	(25,806)	(3,569)
Gain (loss) on derivative instruments, net	$ (27,658)	$ (14,718)	$ (16,486)	$ 26,975

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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