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Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Other current assets [Member] Crude oil commodity contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Other current assets [Member] Crude oil commodity contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Other current assets [Member] Natural Gas Commodity Contracts [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Other assets [Member] Crude oil commodity contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Other assets [Member] Crude oil commodity contracts [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Crude oil commodity contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Crude oil commodity contracts [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Natural Gas Commodity Contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Natural Gas Commodity Contracts [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Crude oil commodity contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Crude oil commodity contracts [Member]	Mar. 31, 2013 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Natural Gas Commodity Contracts [Member]	Dec. 31, 2012 Derivatives not designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Natural Gas Commodity Contracts [Member]	Mar. 31, 2013 Derivatives designated as cash-flow hedging instruments [Member]	Dec. 31, 2012 Derivatives designated as cash-flow hedging instruments [Member]	Mar. 31, 2013 Derivatives designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Interest Rate Swap [Member]	Dec. 31, 2012 Derivatives designated as cash-flow hedging instruments [Member] Derivative liability short term [Member] Interest Rate Swap [Member]	Mar. 31, 2013 Derivatives designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Interest Rate Swap [Member]	Mar. 31, 2012 Derivatives designated as cash-flow hedging instruments [Member] Derivative liability long term [Member] Interest Rate Swap [Member]
Effect of Derivative Instruments on Condensed Consolidated Balance Sheets
Derivative assets	$ 527	$ 1,347	$ 527	$ 1,347	$ 72	$ 189	$ 1,040	$ 455	$ 118
Derivative liabilities	(2,730)	(1,425)								(1,828)	(994)	(322)		(293)	(377)	(190)		(2,730)	(1,425)	(30)		(67)	(54)
Total derivative instruments	$ (2,203)	$ (78)