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Acquisitions and Dispositions Fair Value of Net Assets Acquired (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 03, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Total Identifiable Net Assets |  |  |
Goodwill | $ 796,359 |  | $ 0
Midstream Acquisition [Member] |  |  |
Fair Value of Assets Acquired: |  |  |
Cash and Cash Equivalents |  | $ 8,348 |
Accounts and Notes Receivable |  | 21,199 |
Prepaid Expense |  | 2,006 |
Other Current Assets |  | 163 |
Property, Plant and Equipment, Net |  | 1,043,340 |
Intangible Assets |  | 128,781 |
Other |  | 593 |
Total Assets Acquired |  | 1,204,430 |
Fair Value of Liabilities Assumed: |  |  |
Accounts Payable |  | 26,059 |
CNXM Revolving Credit Facility |  | 149,500 |
Total Liabilities Assumed |  | 175,559 |
Total Identifiable Net Assets |  |  |
Total Identifiable Net Assets |  | 1,028,871 |
Fair Value of Noncontrolling Interest in CNXM |  | (718,577) |
Goodwill |  | 796,359 |
Net Assets Acquired |  | $ 1,106,653 |

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