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Organization and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk |  |  |
Bad debt expense | $ 1,677 | $ 5,144 | $ 3,637
Trade Receivables | Customer Concentration Risk | Anadarko |  |  |
Concentration Risk |  |  |
Concentration risk (percent) | 13.00% | 10.00% |
Trade Receivables | Customer Concentration Risk | Williams Partners |  |  |
Concentration Risk |  |  |
Concentration risk (percent) | 11.00% | 16.00% |

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