Commitments and Contingencies - Minimum Future Rental Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Minimum Future Rental Payments
2020	$ 15,100
2021	14,700
2022	14,600
2023	14,500
2024	14,600
Thereafter	87,800
Total	161,300
Present value adjustment for remaining lease payments	(39,000)
Lease liability - operating leases, net	$ 122,285	$ 132,000
Weighted average discount rate (percent)	4.29%
Weighted average remaining lease term (in years)	12 years 3 months 18 days
Minimum Future Rental Payments at Prior Year End
2019			$ 15,000
2020			14,900
2021			14,400
2022			14,300
2023			14,300
Thereafter			101,800
Total			174,700
Minimum
Minimum Future Rental Payments
Discount rate used to present value lease payments (percent)	2.42%
Maximum
Minimum Future Rental Payments
Discount rate used to present value lease payments (percent)	5.50%
Ground Leases Paid by Realty Income
Minimum Future Rental Payments
2020	$ 1,600
2021	1,400
2022	1,400
2023	1,300
2024	1,300
Thereafter	18,900
Total	25,900
Minimum Future Rental Payments at Prior Year End
2019			1,500
2020			1,400
2021			1,200
2022			1,200
2023			1,200
Thereafter			19,800
Total			26,300
Ground Leases Paid by Our Tenants
Minimum Future Rental Payments
2020	13,500
2021	13,300
2022	13,200
2023	13,200
2024	13,300
Thereafter	68,900
Total	$ 135,400
Minimum Future Rental Payments at Prior Year End
2019			13,500
2020			13,500
2021			13,200
2022			13,100
2023			13,100
Thereafter			82,000
Total			$ 148,400