Management Agreements and Leases - Other Net Lease Agreements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Management Agreements and Leases [Line Items]
Rental income	$ 92,217	$ 100,273
Adjustments necessary to record rent on straight line basis	(1,883)	(3,543)
SMTA Transaction
Management Agreements and Leases [Line Items]
Rental income	29,645	36,653
Adjustments necessary to record rent on straight line basis	$ 1,422	$ 1,701