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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) Customer | Jun. 30, 2018 Customer | Jun. 30, 2019 USD ($) Customer | Jun. 30, 2018 Customer | Jan. 29, 2019 USD ($) | Dec. 31, 2018 USD ($) Customer
Concentration Risk [Line Items] |  |  |  |  |  |
Current accounts receivable | $ 2,632,003 |  | $ 2,632,003 |  |  | $ 2,354,737
Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Number of customers representing ten percent or more of revenue | Customer | 1 | 0 |  | 0 |  |
Number of customers representing ten percent or more of net receivable position | Customer | 0 |  | 0 |  |  | 0
Revenues | Customer Concentration Risk |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk percentage | 13.30% |  | 11.50% |  |  |
PG&E | Pre-Petition Receivables |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Accounts receivable | $ 48,000 |  | $ 48,000 |  | $ 157,000 |
Current accounts receivable | 116,000 |  | 116,000 |  |  |
Proceeds from collection of pre-petition receivables | 109,000 |  |  |  |  |
PG&E | Pre-Petition Receivables | Other Assets, Net |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Accounts receivable | $ 41,000 |  | $ 41,000 |  |  |

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