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Aggregate dividends paid during the period for each share of common stock outstanding.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands														12 Months Ended
	Jan. 10, 2020 $ / shares	Oct. 15, 2019	Oct. 11, 2019 $ / shares	Jul. 12, 2019 $ / shares	Apr. 12, 2019 $ / shares	Jan. 11, 2019 $ / shares	Oct. 12, 2018 $ / shares	Jul. 13, 2018 $ / shares	Apr. 13, 2018 $ / shares	Jan. 12, 2018 $ / shares	Oct. 13, 2017 $ / shares	Jul. 14, 2017 $ / shares	Apr. 14, 2017 $ / shares	Dec. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Significant Accounting Policies
Stock split ratio		2
Intangibles including goodwill														$ 12,100			$ 12,100
Intangible assets														4,300			4,300
Goodwill														7,800			7,800
Accumulated amortization of identified intangible assets														3,100			3,000
Cash and cash equivalents, restricted cash														25,100			24,100
Deferred financing costs														$ 24,000			26,400
Performance obligation description														A membership subscription gives the customer the right to a set schedule of usage at a specified group of Properties. Payments are deferred and recognized on a straight-line basis over the one-year period in which access to Sites at certain Properties are provided. Membership upgrades grant certain additional access rights to the customer and require non-refundable upfront payments. The non-refundable upfront payments are recognized on a straight-line basis over 20 years, which is our estimated membership upgrade contract term.
Operating loss carryforwards																	74,100	$ 74,100
Net investment in real estate U.S federal tax basis														$ 3,700,000
Net investment in notes receivable U.S federal tax basis														39,600
Quarterly distribution paid per common share (usd per share) \| $ / shares			$ 0.3063	$ 0.3063	$ 0.3063	$ 0.2750	$ 0.2750	$ 0.2750	$ 0.2750	$ 0.2438	$ 0.2438	$ 0.2438	$ 0.2438
Right of use asset														15,100
Operating lease liability														16,159
Cumulative effect of change in accounting principle (ASC 606, Revenue Recognition)														$ 154,318			$ 211,034
ASU 2016-02
Significant Accounting Policies
Right of use asset																$ 17,500
Operating lease liability																$ 18,700
2019 Distributions
Significant Accounting Policies
Quarterly distribution paid per common share (usd per share) \| $ / shares						$ 0.031500
Subsequent Event
Significant Accounting Policies
Quarterly distribution paid per common share (usd per share) \| $ / shares	$ 0.3063
Quarterly distribution for tax purposes (usd per share) \| $ / shares	0.015462
Subsequent Event \| ASU 2016-13 \| Plan
Significant Accounting Policies
Cumulative effect of change in accounting principle (ASC 606, Revenue Recognition)															$ (3,900)
Subsequent Event \| 2019 Distributions
Significant Accounting Policies
Quarterly distribution paid per common share (usd per share) \| $ / shares	$ 0.290788
Operating Partnership
Significant Accounting Policies
Ownership interest (percent)														94.60%