Real Estate - Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended				9 Months Ended
	Jun. 30, 2020	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Sep. 30, 2020	Sep. 30, 2019
Real Estate Properties [Line Items]
Acquisitions of real estate assets			$ 56,700		$ 0	$ 240,487
SAFE
Real Estate Properties [Line Items]
Ground lease term (in years)	99 years	99 years		98 years		99 years
Net Lease Asset
Real Estate Properties [Line Items]
Acquisitions of real estate assets						$ 11,500
Leasehold Interest | SAFE
Real Estate Properties [Line Items]
Acquisitions of real estate assets						98,200
Net Lease Asset Two
Real Estate Properties [Line Items]
Acquisitions of real estate assets						$ 110,600