Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014			2013
Beginning QF liability	$	136,448		$	136,652
Unrecovered amount	(10,128		)	(10,647		)
Interest expense	10,573			10,443
Ending QF liability	$	136,893		$	136,448

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
2015	$	69,606	$	56,598	$	13,008
2016	71,598		57,188		14,410
2017	73,622		57,789		15,833
2018	75,688		58,401		17,287
2019	77,791		59,020		18,771
Thereafter	646,783		508,195		138,588
Total	$	1,015,088	$	797,191	$	217,897