Segment Disclosures - Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Disclosure
Total revenues	$ 481,465	$ 423,565	$ 1,412,979	$ 1,213,178
Operating segment
Segment Disclosure
Total revenues	481,465	423,565	1,412,979	1,213,178
Operating segment | Life science
Segment Disclosure
Total revenues	184,213	148,702	531,674	416,081
Operating segment | Medical office
Segment Disclosure
Total revenues	171,482	155,381	496,978	463,866
Operating segment | CCRC
Segment Disclosure
Total revenues	119,022	115,031	352,458	320,737
Operating segment | Other non-reportable
Segment Disclosure
Total revenues	$ 6,748	$ 4,451	$ 31,869	$ 12,494