Derivatives and Risk Management (Tables)

12 Months Ended

Dec. 31, 2012

Derivatives And Risk Management [Abstract]

Balance Sheet Classification of Derivative Financial Instruments

	Derivative Assets
	December 31, 2012					December 31, 2011
	Balance Sheet Classification	Fair Value				Balance Sheet Classification	Fair Value
	(in thousands)
Derivatives designated as hedging instruments:
Fixed and floating price swaps	Hedging asset		$	279,443	Hedging asset				$		333,479
Costless-collars	Hedging asset			–	Hedging asset						179,080
Fixed and floating price swaps	Other assets			8,550	Other assets						201,081
Total derivatives designated as hedging instruments			$	287,993					$		713,640
Derivatives not designated as hedging instruments:
Basis swaps	Hedging asset		$	3,250	Hedging asset				$		1,906
Basis swaps	Other assets			901	Other assets						1,797
Total derivatives not designated as hedging instruments			$	4,151					$		3,703
Total derivative assets			$	292,144					$		717,343
	Derivative Liabilities
	December 31, 2012				December 31, 2011
	Balance Sheet Classification		Fair Value		Balance Sheet Classification				Fair Value
	(in thousands)
Derivatives designated as hedging instruments:
Fixed and floating price swaps	Other current liabilities		$	–	Other current liabilities			$		11,849
Costless-collars	Other current liabilities			–	Other current liabilities					209
Total derivatives designated as hedging instruments			$	–				$		12,058
Derivatives not designated as hedging instruments:
Basis swaps	Other current liabilities		$	138	Other current liabilities			$		400
Basis swaps	Other long-term liabilities			–	Other long-term liabilities					55
Fixed price call options	Other long-term liabilities			4,128	Other long-term liabilities					–
Total derivatives not designated as hedging instruments			$	4,266				$		455
Total derivative liabilities			$	4,266				$		12,513

Cash Flow Hedges, Volumes of Natural Gas Production (in Bcf)

Year	Fixed price swaps
2013	185.6
2014	18.3

Before Tax Effect of Cash Flow Hedges on Consolidated Financial Statements

			Gain Recognized in Other Comprehensive Income
			(Effective Portion)
		For the years ended
		December 31,
Derivative Instrument		2012		2011
		(in thousands)
Fixed price swaps		$	178,660	$	714,740
Costless-collars		$	39,247	$	144,126
	Classification of Gain	Gain Reclassified from Accumulated Other Comprehensive Income into Earnings
	Reclassified from Accumulated	(Effective Portion)
	Other Comprehensive Income	For the years ended
	into Earnings	December 31,
Derivative Instrument	(Effective Portion)	2012		2011
		(in thousands)
Fixed price swaps	Gas Sales	$	413,410	$	256,229
Costless-collars	Gas Sales	$	218,119	$	65,047
		Gain (Loss) Recognized in Earnings
		(Ineffective Portion)
	Classification of Gain (Loss)	For the years ended
	Recognized in Earnings	December 31,
Derivative Instrument	(Ineffective Portion)	2012		2011
		(in thousands)
Fixed price swaps	Gas Sales	$	2,450	$	(4,018)
Costless-collars	Gas Sales	$	(24)	$	(137)

Before Tax Effect of Basis Swaps Not Qualifying for Hedge Accounting

		Unrealized Gain (Loss)
		Recognized in Earnings
	Income Statement	For the years ended
	Classification	December 31,
Derivative Instrument	of Unrealized Loss	2012		2011
		(in thousands)
Basis swaps	Gas Sales	$	766	$	5,222
Fixed price call options	Gas Sales		(4,128)		–
		Realized Gain (Loss)
		Recognized in Earnings
	Income Statement	For the years ended
	Classification	December 31,
Derivative Instrument	of Realized Gain (Loss)	2012		2011
		(in thousands)
Basis swaps	Gas Sales	$	2,125	$	(2,135)