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Acquisitions and Dispositions - Fair Value of Net Assets Acquired (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Jan. 03, 2018
--- | --- | --- | ---
Total Identifiable Net Assets |  |  |
Goodwill | $ 796,359 | $ 796,359 |
Midstream Acquisition |  |  |
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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