Rental Properties Disposition (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Significant Acquisitions and Disposals [Line Items]
Impairment charges	$ 2,206	$ 27,283	$ 1,902
Gain (Loss) on Disposition of Assets	4,174	3,037	41,942
Education Reportable Operating Segment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Property, Plant, and Equipment	5,900
Investment Building and Building Improvements	38,600	49,700
Experiential Reportable Operating Segment [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to Acquire Property, Plant, and Equipment	451,900
Investment Building and Building Improvements	$ 146,200	$ 288,100
number of properties sold	4	4
Proceeds from Sale of Property, Plant, and Equipment	$ 21,900	$ 7,300
Gain (Loss) on Disposition of Assets	$ 4,200	$ 1,200
Education Property [Member]
Significant Acquisitions and Disposals [Line Items]
number of properties sold pursuant to tenant purchase option	10	1
Education Property [Member] | Education Reportable Operating Segment [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of property, plant, and equipment tenant purchase option	$ 138,500	$ 12,000
Gain (Loss) on disposition of assets from tenant purchase option	$ 30,000	$ 1,900
Theatre Properties Member
Significant Acquisitions and Disposals [Line Items]
Number of properties acquired	26	2
Payments to Acquire Property, Plant, and Equipment	$ 426,500	$ 22,400
early childhood education center [Member]
Significant Acquisitions and Disposals [Line Items]
Number of properties acquired	2	4
Payments to Acquire Property, Plant, and Equipment		$ 17,700
number of properties sold	1	2
Proceeds from Sale of Property, Plant, and Equipment		$ 2,500
Gain (Loss) on Disposition of Assets		$ 0
Public charter school properties [Member]
Significant Acquisitions and Disposals [Line Items]
number of properties sold	7
Proceeds from Sale of Property, Plant, and Equipment	$ 44,400
Gain (Loss) on Disposition of Assets	$ 1,900
Attraction Properties [Member]
Significant Acquisitions and Disposals [Line Items]
number of properties sold	1
Mortgage Note Receivable from Property Sale	$ 27,400
Proceeds from Sale of Property, Plant, and Equipment	$ 11,000
Imagine Schools [Member]
Significant Acquisitions and Disposals [Line Items]
number of properties sold	2	4
Impairment charges			$ 9,600
Public Charter School Portfolio Sale [Member]
Significant Acquisitions and Disposals [Line Items]
Non-cash write off	$ 24,800
number of properties sold	47
Proceeds from Sale of Property, Plant, and Equipment	$ 449,600
Impairment charges	$ 21,400