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Other (Notes)	3 Months Ended
Other (Notes)	Mar. 31, 2018
Other Income and Expenses [Abstract]
Other	OTHER The Advances for construction costs on the accompanying Condensed Consolidated Balance Sheet are associated with advances received from a third party related to construction costs on the Atlantic Sunrise project. This balance increases as we receive additional advances. After construction of the project is completed, the related liabilities will be reclassified to Long-Term Debt and reduced by payments we make to the third party under terms of the applicable lease agreement.