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Commitments and Contingencies - Operating Lease Obligations Table (Details) - Western Gas Partners, LP [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]  
2018 $ 8,402
2019 7,506
2020 1,615
2021 460
2022 467
Thereafter 2,021
Total $ 20,471