Rental Properties Summary Of Carrying Amounts Of Rental Properties (Details)		12 Months Ended
	Apr. 06, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 02, 2018 properties
Real Estate Properties [Line Items]
Rental Properties	$ 481,006,000
Indefinite-Lived Trade Names	6,355,000
Below Market Lease, Net	(7,611,000)	$ (8,100,000)	$ (8,792,000)
Payments to Acquire Productive Assets		187,460,000	397,556,000	$ 219,169,000
Number of Properties Securing Mortgage Note | properties					1
Stock Issued During Period, Value, Acquisitions	$ 657,500,000	0	657,473,000	$ 0
Stock Issued During Period, Shares, Acquisitions | shares	8,851,264
Closing Price at Acquisition Date | $ / shares	$ 74.28
number of properties sold				9
Real Estate Investment Property Gross		5,907,231,000	5,345,565,000
Accumulated depreciation		(883,174,000)	(741,334,000)
Total		5,024,057,000	4,604,231,000
Depreciation expense on rental properties		148,700,000	129,100,000	$ 103,900,000
Payments to Acquire Property, Plant, and Equipment	$ 61,200,000
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	$ 12,100,000
Building and Building Improvements [Member]
Real Estate Properties [Line Items]
Real Estate Investment Property Gross		4,593,159,000	4,123,356,000
Furniture and Fixtures [Member]
Real Estate Properties [Line Items]
Real Estate Investment Property Gross		97,463,000	87,630,000
Land [Member]
Real Estate Properties [Line Items]
Real Estate Investment Property Gross		1,190,568,000	1,108,805,000
Leaseholds and Leasehold Improvements [Member]
Real Estate Properties [Line Items]
Real Estate Investment Property Gross		$ 26,041,000	$ 25,774,000
Theatre Properties Member
Real Estate Properties [Line Items]
Number of properties acquired		2	6
Payments to Acquire Property, Plant, and Equipment		$ 22,400,000	$ 154,100,000
Recreation Facility [Member]
Real Estate Properties [Line Items]
Payments to Acquire Property, Plant, and Equipment		7,800,000
Other Recreation [Member]
Real Estate Properties [Line Items]
Number of properties acquired			6
Payments to Acquire Property, Plant, and Equipment		36,400,000	$ 62,700,000
early childhood education center [Member]
Real Estate Properties [Line Items]
Proceeds from Sale of Property, Plant, and Equipment		2,500,000
Gain (Loss) on Disposition of Assets		$ 0
Number of properties acquired		4
Payments to Acquire Property, Plant, and Equipment		$ 17,700,000
attractions [Member]
Real Estate Properties [Line Items]
number of properties sold	1
Proceeds from Sale of Property, Plant, and Equipment	$ 2,500,000
Number of properties acquired	15
Payments to Acquire Property, Plant, and Equipment		$ 50,300,000
family entertainment center [Member]
Real Estate Properties [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 6,800,000
Number of properties acquired	5
attractions and family entertainment centers [Member]
Real Estate Properties [Line Items]
Gain (Loss) on Disposition of Assets	$ 0
Property, Plant and Equipment, Additions	479,800,000
Ski Resorts [Member]
Real Estate Properties [Line Items]
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 251,038,000
Number of Properties Securing Mortgage Note	14
Property, Plant and Equipment, Additions	$ 374,500,000
Mortgage Loans on Real Estate, Carrying Amount of Mortgages	$ 251,000,000
Recreation Reportable Operating Segment [Member] | Ski Resorts, Attractions and Family Entertainment Centers [Member]
Real Estate Properties [Line Items]
Payments to Acquire Productive Assets			$ 730,788,000