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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Carrying Value
Liabilities:
Long-term debt	$ 794,434	$ 794,269
Total Fair Value
Liabilities:
Long-term debt	782,750	755,000
Recurring basis \| Level 2
Liabilities:
Total fair value, net	232,550	251,696
Recurring basis \| Level 2 \| Commodity derivatives
Assets:
Derivative asset, fair value	241,244	252,485
Liabilities:
Derivative liability, fair value	(7,731)
Recurring basis \| Level 2 \| Interest rate contracts
Assets:
Derivative asset, fair value	100
Liabilities:
Derivative liability, fair value	(1,063)	(789)
Recurring basis \| Total Fair Value
Liabilities:
Total fair value, net	232,550	251,696
Recurring basis \| Total Fair Value \| Commodity derivatives
Assets:
Derivative asset, fair value	241,244	252,485
Liabilities:
Derivative liability, fair value	(7,731)
Recurring basis \| Total Fair Value \| Interest rate contracts
Assets:
Derivative asset, fair value	100
Liabilities:
Derivative liability, fair value	$ (1,063)	$ (789)

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details