Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Measurements

Derivative instrument assets and liabilities measured at fair value on a recurring basis

			Fair value measurements at reporting date using
Description	As of March 31, 2014		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
			(Thousands)
Assets
Derivative instruments, at fair value	$	79,821	$	246	$	79,575	$	–
Liabilities
Derivative instruments, at fair value	$	59,333	$	–	$	59,333	$	–
			Fair value measurements at reporting date using
Description	As of December 31, 2013		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
			(Thousands)
Assets
Derivative instruments, at fair value	$	107,647	$	240	$	107,407	$	–
Liabilities
Derivative instruments, at fair value	$	29,651	$	315	$	29,336	$	–

Fair value measurements using significant unobservable inputs (Level 3)

	Fair value measurements using significant unobservable inputs (Level 3)
	Derivative instruments, at fair value, net Three Months Ended March 31,
	2014		2013
	(Thousands)
Balance as of January 1	$	–	$	90,714
Total gains or losses:
Included in earnings	–		423
Included in OCI	–		(11,733)
Purchases	–		72
Settlements	–		(9,611)
Transfers in and/or out of Level 3	–		–
Balance as of March 31	$	–	$	69,865