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Commitments and Contingencies Litigation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Revenues | $ 65,690 | $ 63,146 | $ 185,406 | $ 160,222 |
Accounts receivable, net | 58,749 |  | 58,749 |  | $ 18,989
Pending Litigation |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Revenues | 16,343 |  | 31,893 |  |
Accounts receivable, net | $ 35,045 |  | $ 35,045 |  |

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