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Leases Summary of Lease Related Expenses (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | [1]
Lessee, Lease, Description [Line Items] |  |  |  |  |
Amortization of asset | $ 420 |  |  |  |
Interest on lease liabilities | 202 |  |  |  |
Sublease income | 1,419 |  |  |  |
Net lease expense | 400,764 |  |  |  |
Variable lease expenses primarily related to additional volumes processed at gas processing plant |  | $ 28,700 |  |  |
Lease operating expenses |  | 605,180 | $ 353,832 | [1] | $ 299,420
Selling and general expenses |  | 232,736 | 205,192 | [1] | $ 207,391
Property, plant and equipment, Net |  | 9,969,743 | 8,432,133 | [2] |
Asset Retirement Obligation, Current |  | 39,315 | $ 47,598 |  |
Property, plant and equipment |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease cost | 133,837 |  |  |  |
Property, plant and equipment, Net |  | 102,700 |  |  |
Asset retirement obligations |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease cost | 3,024 |  |  |  |
Asset Retirement Obligation, Current |  | 3,000 |  |  |
Lease operating expenses |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease cost | 249,787 |  |  |  |
Lease operating expenses |  | 56,300 |  |  |
Selling and general expense |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease cost | 12,325 |  |  |  |
Selling and general expenses |  | 4,300 |  |  |
Other operating expense |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating lease cost | $ 2,588 |  |  |  |
Other expense (benefit) |  | $ 2,600 |  |  |
[1] | 1 Reclassified to conform with current presentation (see Notes C and E). 2017 revenue is presented net of $58.9 million of transportation, gathering and processing costs as historically shown prior to the adoption of ASC 606 on January 1, 2018. See Notes to Consolidated Financial Statements, page 58.
[2] | Reclassified to conform with current presentation (see Note E)

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