Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer
Revenues	$ 755,351	$ 629,871	$ 1,433,599	$ 1,133,851
Management services, servicing fees and other
Revenue from External Customer
Revenues			466,804	407,259
Leasing and other commissions
Revenue from External Customer
Revenues			411,778	331,779
Investment sales
Revenue from External Customer
Revenues			361,167	243,778
Commercial mortgage origination, net
Revenue from External Customer
Revenues			$ 193,850	$ 151,035