Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Fair Value Of Assets And Liabilities Measured And Recorded On Recurring Basis

The following tables summarize the fair value of our financial assets and liabilities measured and recorded at fair value on a recurring basis as of September 30, 2011 and December 31, 2010 based on inputs used to derive their fair values:

				Fair Value Measurements  at September 30, 2011 Using
	Fair Value Total			Level 1			Level 2
Assets:
Marketable securities	$	3,151		$	3,151		$	—
Interest rate derivatives	30,564			—			30,564
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	74,892			74,892			—
Swing Swaps IFERC	21,818			1,074			20,744
Fixed Swaps/Futures	70,270			70,112			158
Options — Puts	13,348			—			13,348
Forward Physical Swaps	738			—			738
Propane — Forwards/Swaps	77			—			77
Total commodity derivatives	181,143			146,078			35,065
Total Assets	$	214,858		$	149,229		$	65,629
Liabilities:
Interest rate derivatives	$	(98,580	)	$	—		$	(98,580	)
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	(68,918		)	(68,918		)	—
Swing Swaps IFERC	(22,707		)	(1,988		)	(20,719		)
Fixed Swaps/Futures	(48,287		)	(48,133		)	(154		)
Options — Puts	(423		)	—			(423		)
Options — Calls	(122		)	—			(122		)
Forward Physical Swaps	(482		)	—			(482		)
Propane — Forwards/Swaps	(2,086		)	—			(2,086		)
Total commodity derivatives	(143,025		)	(119,039		)	(23,986		)
Total Liabilities	$	(241,605	)	$	(119,039	)	$	(122,566	)

				Fair Value Measurements  at December 31, 2010 Using
	Fair Value Total			Level 1			Level 2
Assets:
Marketable securities	$	2,032		$	2,032		$	—
Interest rate derivatives	20,790			—			20,790
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	15,756			15,756			—
Swing Swaps IFERC	1,682			1,562			120
Fixed Swaps/Futures	42,474			42,474			—
Options — Puts	26,241			—			26,241
Options — Calls	75			—			75
Propane – Forwards/Swaps	6,864			—			6,864
Total commodity derivatives	93,092			59,792			33,300
Total Assets	$	115,914		$	61,824		$	54,090
Liabilities:
Interest rate derivatives	$	(18,338	)	$	—		$	(18,338	)
Commodity derivatives:
Natural Gas:
Basis Swaps IFERC/NYMEX	(17,372		)	(17,372		)	—
Swing Swaps IFERC	(3,768		)	(3,520		)	(248		)
Fixed Swaps/Futures	(41,825		)	(41,825		)	—
Options — Puts	(7		)	—			(7		)
Options — Calls	(2,643		)	—			(2,643		)
Total commodity derivatives	(65,615		)	(62,717		)	(2,898		)
Total Liabilities	$	(83,953	)	$	(62,717	)	$	(21,236	)