Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies Disclosure [Abstract]

Schedule Of Changes In Qualifying Facility Liability

The following summarizes the change in the QF liability (in thousands):

	December 31,
	2011			2010
Beginning QF liability	$	177,322		$	165,839
Unrecovered amount	(6,043		)	(1,198		)
Interest expense	12,908			12,681
Ending QF liability	$	184,187		$	177,322

Schedule Of Estimated Gross Contractual Obligation Less Amounts Recoverable Through Rates

The following summarizes the estimated gross contractual obligation less amounts recoverable through rates (in thousands):

	Gross Obligation		Recoverable Amounts		Net
2012	$	67,111	$	54,904	$	12,207
2013	69,816		55,462		14,354
2014	72,354		56,025		16,329
2015	74,135		56,598		17,537
2016	75,945		57,188		18,757
Thereafter	909,322		683,404		225,918
Total	$	1,268,683	$	963,581	$	305,102