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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets [Abstract]
NYMEX Fixed Price Derivative contracts	$ 23,195us-gaap_DerivativeAssets	$ 1,010us-gaap_DerivativeAssets
Liabilities [Abstract]
NYMEX Fixed Price Derivative contracts	13us-gaap_DerivativeLiabilities	5,002us-gaap_DerivativeLiabilities
Recurring Basis [Member]
Assets [Abstract]
NYMEX Fixed Price Derivative contracts	23,195	1,010
Total Assets	23,195	1,010
Liabilities [Abstract]
NYMEX Fixed Price Derivative contracts	13	5,002
Total Liabilities	13	5,002
Recurring Basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
NYMEX Fixed Price Derivative contracts	0	0
Total Assets	0	0
Liabilities [Abstract]
NYMEX Fixed Price Derivative contracts	0	0
Total Liabilities	0	0
Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
NYMEX Fixed Price Derivative contracts	23,195	1,010
Total Assets	23,195	1,010
Liabilities [Abstract]
NYMEX Fixed Price Derivative contracts	13	5,002
Total Liabilities	13	5,002
Recurring Basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
NYMEX Fixed Price Derivative contracts	0	0
Total Assets	0	0
Liabilities [Abstract]
NYMEX Fixed Price Derivative contracts	0	0
Total Liabilities	$ 0	$ 0

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 liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details