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Commitments and Contingencies Litigation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Revenues | $ 67,941 | $ 54,448 | $ 119,716 | $ 97,076 |
Accounts receivable, net | 45,652 |  | 45,652 |  | $ 18,989
Pending Litigation [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Revenues | 17,573 |  | 24,252 |  |
Accounts receivable, net | $ 34,564 |  | $ 34,564 |  |

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