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Acquisitions and Dispositions Disposition (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Mar. 02, 2018 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill, Acquired During Period | $ 15,560,000 |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | $ 3,100,000
Notes Receivable, Related Parties |  |  |  | 7,500,000
Loans Receivable with Fixed Rates of Interest |  |  |  | 0.0152
Asset Retirement Obligation | 12,073,000 | $ 11,929,000 |  | 11,738,000
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 47,000,000 |
Gain (Loss) on Disposition of Business | (33,813,000) |  |  |
Business Exit Costs | $ 1,400,000 |  |  |
Maritech [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset Retirement Obligation |  |  |  | $ 46,800,000

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