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Commitments and Contingencies - Operating Lease Obligations Table (Details) - Western Gas Partners, LP [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]  
2019 $ 8,711
2020 2,236
2021 460
2022 467
2023 473
Thereafter 1,547
Total $ 13,894