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Segment Information - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Segment | Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  |  | 4 |
Revenues | $ 673,962 | $ 618,683 | $ 1,971,264 | $ 1,813,182
London, Bermuda and Cayman Islands |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 9,100 | $ 4,400 | $ 25,400 | $ 12,400

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