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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Fair value of commodity derivatives	$ 0	$ 2,518
Liabilities:
Fair value of commodity derivatives	1,594	208
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Fair value of commodity derivatives	0	2,518
Total assets	0	2,518
Liabilities:
Fair value of commodity derivatives	1,594	208
Total liabilities	$ 1,594	$ 208

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