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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer
Revenues	$ 503,980	$ 483,930
Leasing and other commissions
Revenue from External Customer
Revenues	147,433	140,439
Capital markets commissions
Revenue from External Customer
Revenues	121,403	127,923
Gains from mortgage banking activities/originations, net
Revenue from External Customer
Revenues	47,393	50,422
Management services, servicing fees and other
Revenue from External Customer
Revenues	$ 187,751	$ 165,146

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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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