Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Financial Instruments [Abstract]

Fair Value Of Derivative Financial Instruments

(in thousands)	Balance Sheet location	March 31, 2012			December 31, 2011
Commodity contracts	Derivative financial instruments - Current assets	$	171,182		$	164,002
Commodity contracts	Derivative financial instruments - Long-term assets		10,073			11,034
Commodity contracts	Derivative financial instruments - Current liabilities		(3,447	)		(1,800	)
Commodity contracts	Derivative financial instruments - Long-term liabilities		(852	)		0
Net derivatives		$	176,956		$	173,236

Effect Of Derivative Financial Instruments

Three months ended March 31,
(in thousands)	Statement of Operations location	2012		2011
Commodity contracts (1)	Gain on derivative financial instruments	$	53,865	$	3,421

(1) Included in these amounts are net cash receipts of $50,145 and $26,935 for the three months ended March 31, 2012 and 2011, respectively.

Fair Value Of Oil And Natural Gas Derivative Financial Instruments

(in thousands, except prices)	Volume Mmbtus/Bbls		Weighted average strike price per Mmbtu/Bbl		Fair value at March 31, 2012
Natural gas:
Swaps:
Remainder of 2012		60,500	$	5.27	$	167,304
2013		5,475		5.99		13,626
Total natural gas		65,975				180,930
Oil:
Swaps:
Remainder of 2012		413		98.05		(2,666	)
2013		365		99.96		(1,308	)
Total oil		778				(3,974	)
Total oil and natural gas derivatives					$	176,956