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Segments - Reconciliation of Revenues from Reportable Segments to Consolidated Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 19,333 | $ 23,583 | $ 30,424 | $ 29,838 | $ 17,002 | $ 18,299 | $ 32,836 | $ 22,585 | $ 103,178 | $ 90,722 | $ 151,178
Other revenues, including from other operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,634 | 17,964 | 40,841
Elimination of intersegment revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (5,624) | (14,690) | (2,561)
Total segment revenues from reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 98,168 | $ 87,448 | $ 112,898

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