Subsequent Events - Closed Acquisitions (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 10, 2017	Oct. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2017
Subsequent Event [Line Items]
Purchase price			$ 190,183		$ 1,000,000
Subsequent Event
Subsequent Event [Line Items]
Purchase price		$ 28,699
Operating Partnership
Subsequent Event [Line Items]
Purchase price				$ 78,600
Operating Partnership | Subsequent Event | Franklin MOB & ASC
Subsequent Event [Line Items]
Purchase price	$ 9,950
Operating Partnership | Subsequent Event | Davis Portfolio 2.0 (2 MOBs)
Subsequent Event [Line Items]
Purchase price	$ 18,749