Derivative Instruments and Hedging Activities (Fair Value of Derivative Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 15,585	$ 19,943
Liability Fair Value	(4,290)
Net Derivative Fair Value	11,295	19,943
Non-Current Liabilities Fair Market Value Of Derivatives [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(3,602)
Non-Current Liabilities Fair Market Value Of Derivatives [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(3,602)
Current assets - Fair market value of derivatives [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	15,585	19,943
Current assets - Fair market value of derivatives [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	15,096	19,943
Current assets - Fair market value of derivatives [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Asset Fair Value	489
Current liabilities - Fair value of derivatives [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(688)
Current liabilities - Fair value of derivatives [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Liability Fair Value	(688)
Balance Sheet Current [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Net Derivative Fair Value	14,408	$ 19,943
Balance Sheet Current [Member] \| Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Net Derivative Fair Value	489
Balance Sheet Non Current [Member] \| Crude Oil [Member]
Derivatives, Fair Value [Line Items]
Net Derivative Fair Value	$ (3,602)

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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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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No definition available.

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