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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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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

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