Commitments and Contingencies - Minimum Future Rental Payments Due on Ground Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Minimum Future Rental Payments Due
2019	$ 7,600
2020	15,000
2021	14,500
2022	14,300
2023	14,300
Thereafter	102,000
Total	167,700
Present value adjustment for remaining lease payments	(40,900)
Lease liability - operating leases, net	$ 126,778
Weighted average discount rate (percent)	4.29%
Weighted average remaining lease term	12 years 8 months 12 days
Ground Leases Paid by Realty Income
Minimum Future Rental Payments Due
2019	$ 800
2020	1,500
2021	1,300
2022	1,200
2023	1,200
Thereafter	19,900
Total	25,900
Ground Leases Paid by Our Tenants
Minimum Future Rental Payments Due
2019	6,800
2020	13,500
2021	13,200
2022	13,100
2023	13,100
Thereafter	82,100
Total	$ 141,800
Minimum
Minimum Future Rental Payments Due
Discount rate used to present value lease payments (percent)	3.09%
Maximum
Minimum Future Rental Payments Due
Discount rate used to present value lease payments (percent)	5.50%