Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Measurements [Abstract]

Carrying Amount And Estimated Fair Values Of Financial Instruments

	March 31,				December 31,
	2014				2013
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
	(in thousands)
Cash and cash equivalents	$	18,719	$	18,719	$	22,938	$	22,938
Credit facility	$	160,200	$	160,200	$	282,900	$	282,900
Senior notes	$	1,668,426	$	1,825,949	$	1,668,396	$	1,795,935
Derivative instruments	$	(72,225)	$	(72,225)	$	38,013	$	38,013

Summary Assets And Liabilities Measured At Fair Value On Recurring Basis

	March 31, 2014
	Fair Value Measurements Using:
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets		Observable Inputs		Unobservable Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Derivative assets	$	–	$	37,461	$	9,692	$	47,153
Derivative liabilities		–		(53,665)		(65,713)		(119,378)
Total	$	–	$	(16,204)	$	(56,021)	$	(72,225)
	December 31, 2013
	Fair Value Measurements Using:
	Quoted Prices		Significant
	in Active		Other		Significant
	Markets		Observable Inputs		Unobservable Inputs		Assets (Liabilities)
	(Level 1)		(Level 2)		(Level 3)		at Fair Value
Derivative assets	$	–	$	65,538	$	12,965	$	78,503
Derivative liabilities		–		(8,601)		(31,889)		(40,490)
Total	$	–	$	56,937	$	(18,924)	$	38,013

Assets Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs (Level 3), Reconciliation

	For the three months ended
	March 31,
	2014		2013
	(in thousands)
Balance at beginning of period	$	(18,924)	$	(115)
Total gains (losses):
Included in earnings		(51,367)		(59,025)
Included in other comprehensive income		–		–
Purchases, issuances, and settlements:
Purchases		–		–
Issuances		–		–
Settlements		14,270		(1,007)
Transfers into/out of Level 3		–		–
Balance at end of period	$	(56,021)	$	(60,147)
Change in losses included in earnings relating to derivatives still held as of March 31	$	(37,097)	$	(60,032)