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Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer
Revenues	$ 629,871	$ 383,718	$ 1,133,851	$ 867,647
Leasing and other commissions
Revenue from External Customer
Revenues	184,346	120,079	331,779	260,517
Capital markets commissions
Revenue from External Customer
Revenues	184,756	52,959	306,159	180,882
Gains from mortgage banking activities/originations, net
Revenue from External Customer
Revenues	41,260	69,071	88,653	119,494
Management services, servicing fees and other
Revenue from External Customer
Revenues	$ 219,509	$ 141,609	$ 407,260	$ 306,754

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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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