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Acquisitions and Dispositions Acquisitions and Dispositions (Details 2) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 02, 2018 | Feb. 13, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 40,000,000 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 7,772,021 |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 3,100,000.000000000 |  |  |  |
Notes Receivable, Related Parties | 7,500,000 |  |  |  |
Loans Receivable with Fixed Rates of Interest | 0.015 |  |  |  |
Asset Retirement Obligation | 58,402,000 |  |  | $ 55,478,000 | $ 57,449,000
Line of Credit Facility, Maximum Borrowing Capacity | 200,000,000 |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 33,000,000 |  |  |  |
discontinued operation, loss net of tax, maximum | 35,000,000 |  |  |  |
Maritech [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Asset Retirement Obligation | $ 46,800,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, maximum |  |  | $ 15,000,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 47,000,000 |  |  |

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