Summary of Significant Accounting Policies - Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer
Revenues	$ 2,705,527	$ 2,906,443	$ 1,904,998
Management services, servicing fees and other
Revenue from External Customer
Revenues	909,485	915,715	626,136
Leasing and other commissions
Revenue from External Customer
Revenues	831,874	826,942	513,842
Investment sales
Revenue from External Customer
Revenues	606,416	757,744	403,971
Commercial mortgage origination, net
Revenue from External Customer
Revenues	$ 357,752	$ 406,042	$ 361,049