Real Estate - Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	May 31, 2019	Feb. 28, 2019	Mar. 31, 2020	Mar. 31, 2019
Real Estate Properties [Line Items]
Acquisitions of real estate assets	$ 56,700		$ 0	$ 109,663
Net Lease Asset
Real Estate Properties [Line Items]
Acquisitions of real estate assets				11,500
Leasehold Interest
Real Estate Properties [Line Items]
Acquisitions of real estate assets				$ 98,200
SAFE
Real Estate Properties [Line Items]
Ground lease term (in years)		98 years