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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer
Revenues	$ 520,799	$ 678,247
Management services, servicing fees and other
Revenue from External Customer
Revenues	212,292	233,120
Leasing and other commissions
Revenue from External Customer
Revenues	193,306	198,952
Investment sales
Revenue from External Customer
Revenues	71,993	152,113
Commercial mortgage origination, net
Revenue from External Customer
Revenues	$ 43,208	$ 94,062

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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