Management Agreements and Leases - Other Net Lease Agreements and Additional Lease Information (Details) $ in Thousands		1 Months Ended				3 Months Ended		6 Months Ended
	Aug. 06, 2020 USD ($)	Jul. 31, 2020	Jun. 30, 2020 USD ($) tenant property	May 31, 2020	Apr. 30, 2020	Jun. 30, 2020 USD ($) tenant property	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) tenant property	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Management Agreements and Leases [Line Items]
Rental income						$ 97,584	$ 68,217	$ 197,656	$ 136,890
Total revenues						214,940	610,562	698,716	1,135,470
Adjustments necessary to record rent on straight line basis						$ 875	$ (3,190)	$ (2,669)	$ (4,322)
COVID-19
Management Agreements and Leases [Line Items]
Percent of collected rents			74.60%	57.60%	45.60%	58.70%
Number of rent deferral agreements | tenant			80			80		80
Amount of deferred annual minimum rents								$ 59,288
Reserves for uncollectible amounts against rental income						$ 4,995		5,905
Reserves for uncollectible rents			$ 11,835			11,835		$ 11,835		$ 5,981
COVID-19 | Subsequent event
Management Agreements and Leases [Line Items]
Percent of collected rents		80.00%
Amount of deferred annual minimum rents	$ 11,312
COVID-19 | Minimum
Management Agreements and Leases [Line Items]
Deferred rent repayment period								12 months
Rent deferrals								1 month
COVID-19 | Maximum
Management Agreements and Leases [Line Items]
Deferred rent repayment period								24 months
Rent deferrals								4 months
SMTA Transaction
Management Agreements and Leases [Line Items]
Rental income						32,386		$ 69,039
Adjustments necessary to record rent on straight line basis						$ 4,099		$ 5,800
Other Net Lease Contracts
Management Agreements and Leases [Line Items]
Number of properties owned | property			630			630		630