Segment Disclosures - Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Disclosure
Total revenues	$ 476,238	$ 408,559	$ 931,514	$ 789,613
Operating segment
Segment Disclosure
Total revenues	476,238	408,559	931,514	789,613
Operating segment | Life science
Segment Disclosure
Total revenues	177,527	138,496	347,461	267,379
Operating segment | Medical office
Segment Disclosure
Total revenues	165,295	151,844	325,496	308,485
Operating segment | CCRC
Segment Disclosure
Total revenues	117,308	113,926	233,436	205,706
Operating segment | Other non-reportable
Segment Disclosure
Total revenues	$ 16,108	$ 4,293	$ 25,121	$ 8,043