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Commitments and Contingencies - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 04, 2019 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Number of properties subject to gound leases | property		8		8
Right-of-use asset		$ 51,600		$ 51,600
Right-of-use liability		$ 24,641		$ 24,641
Weighted average remaining lease term		34 years		34 years
Weighted average discount rate		4.33%		4.33%
Payments		$ 300		$ 700
Expense		$ 300		700
Rent expense			$ 300		$ 700
Payments for legal settlements	$ 7,400
Legal settlement reserve						$ 7,400
Asset management fees | Service Provider | Defendants vs. Service Providers
Loss Contingencies [Line Items]
Legal expenses				$ 1,000
Minimum
Loss Contingencies [Line Items]
Term of contract		16 years		16 years
Maximum
Loss Contingencies [Line Items]
Term of contract		85 years		85 years

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of separate real estate development properties located on land subject to ground leases.

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Amount of operating lease expense. Excludes sublease income.

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

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