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Commitments and Contingencies - Concentrations of Credit Risk (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) Customer | Mar. 31, 2018 Customer | Jan. 29, 2019 USD ($) | Dec. 31, 2018 USD ($) Customer
Concentration Risk [Line Items] |  |  |  |
Current accounts receivable | $ 2,580,665 |  |  | $ 2,354,737
Long-term accounts receivable | $ 69,000 |  |  | $ 25,900
Customer Concentration Risk |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers representing ten percent or more of net receivable position | Customer | 0 |  |  | 0
Number of customers representing ten percent or more of revenue | Customer | 0 | 0 |  |
PG&E |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Accounts receivable |  |  | $ 157,000 |
Long-term accounts receivable | $ 41,200 |  |  |
PG&E | Pre-Petition Receivables |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Current accounts receivable | 116,000 |  |  |
Long-term accounts receivable | $ 41,000 |  |  |

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