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Investments and Dispositions (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Investments and Dispositions (Details) $ in Thousands	Sep. 30, 2019 USD ($) mortgagenotes	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) mortgagenotes	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			$ 684,700
Number Of Mortgage Notes Receivable \| mortgagenotes	4		4
Payments to Acquire Mortgage Notes Receivable			$ 98,071	$ 27,719
Gain on sale of real estate	$ 14,303	$ 2,215	30,405	2,688
Proceeds from Sale and Collection of Mortgage Notes Receivable			207,125	$ 272,004
Proceeds from Maturities, Prepayments and Calls of Securities, Operating Activities			1,800
recreation and education properties [Member]
Real Estate Properties [Line Items]
Proceeds from Sale of Property, Plant, and Equipment			53,300
Gain on sale of real estate			2,100
Entertainment Reportable Operating Segment [Member]
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			$ 440,400
Entertainment Reportable Operating Segment [Member] \| Theatre Properties [Member]
Real Estate Properties [Line Items]
Number of properties acquired (in properties)			24
Payments to Acquire Productive Assets			$ 377,800
Recreation Reportable Operating Segment [Member]
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			$ 190,600
Number Of Mortgage Notes Receivable	2		2
Number of properties securing mortgage			2
Payments to Acquire Mortgage Notes Receivable			$ 68,700
number of properties sold			1
number of land parcels sold			2
Recreation Reportable Operating Segment [Member] \| Attraction Properties [Member]
Real Estate Properties [Line Items]
Number of properties acquired (in properties)			2
Payments to Acquire Productive Assets			$ 24,000
Proceeds from Sale and Collection of Mortgage Notes Receivable			189,800
Education Reportable Operating Segment [Member]
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			$ 53,400
number of properties sold			7
Education Reportable Operating Segment [Member] \| early education center [Member]
Real Estate Properties [Line Items]
Number of properties acquired (in properties)			2
Payments to Acquire Productive Assets			$ 5,900
Education Reportable Operating Segment [Member] \| Public charter school properties [Member]
Real Estate Properties [Line Items]
number of properties sold			1
Proceeds from Sale of Property, Plant, and Equipment			$ 129,300
Gain on sale of real estate			28,300
Proceeds from Sale and Collection of Mortgage Notes Receivable			17,800
Other Reportable Operating Segment [Member]
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			300
Adelaar Infrastructure [Member]
Real Estate Properties [Line Items]
Special Assessment Bond	$ 110,000		110,000
Reimbursement received from payment of economic development revenue bonds			$ 11,500		$ 74,200
Mortgage Receivable [Member] \| Education Reportable Operating Segment [Member] \| Public charter school properties [Member]
Real Estate Properties [Line Items]
number of properties sold			9