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Acquisitions
 9 Months Ended
Sep. 30, 2012
Acquisitions [Abstract]  
Acquisitions [Text Block]
Acquisitions
On May 18, 2012, the Company acquired a 50 percent undivided interest in natural gas and oil midstream assets in western North Dakota. The acquisition includes a natural gas processing plant and a natural gas gathering pipeline system, along with an oil gathering system, an oil storage terminal and an oil pipeline. The total purchase consideration for acquisitions was approximately $67.5 million, including the Company's interest in the above facilities and a purchase price adjustment related to an acquisition made prior to 2012. The Company recognizes its proportionate share of the assets, liabilities, revenues and expenses related to the natural gas and oil midstream assets acquisition. Proforma financial amounts reflecting the effects of the above acquisitions have not been presented, as the acquisitions were not material to the Company's financial position or results of operations.