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Basis of Presentation - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) partnership | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of partnerships consolidated | partnership |  |  |  | 2 |  |
VIE, ownership interest rate (as a percent) |  |  |  | 80.00% |  |
Amortization of purchase-related intangible assets | $ 3,873 |  | $ 3,873 | $ 11,619 | $ 12,052 |
5 Arches |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 25,000
Shares issued for settlement of remaining deferred consideration | shares |  | 806,068 |  |  |  |
Cash payment for contingent consideration liability |  | $ 1,000 |  |  |  |
CoreVest |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 57,000

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