Management Agreements and Leases - Other Net Lease Agreements and Additional Lease Information (Details) $ in Thousands		3 Months Ended
	May 07, 2020 USD ($)	Mar. 31, 2020 USD ($) tenant property	Mar. 31, 2019 USD ($)
Management Agreements and Leases [Line Items]
Number of properties owned | property		7
Total revenues		$ 483,776	$ 524,908
Adjustments necessary to record rent on straight line basis		$ (3,543)	1,132
Number of rent deferral agreements | tenant		84
Amount of deferred annual minimum rents		$ 61,963
Subsequent event
Management Agreements and Leases [Line Items]
Amount of deferred annual minimum rents	$ 8,584
SMTA Transaction
Management Agreements and Leases [Line Items]
Adjustments necessary to record rent on straight line basis		1,701
Rental income
Management Agreements and Leases [Line Items]
Total revenues		100,072	$ 68,673
Rental income | SMTA Transaction
Management Agreements and Leases [Line Items]
Total revenues		$ 36,653
Other Net Lease Contracts
Management Agreements and Leases [Line Items]
Number of properties owned | property		634