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Commitments and Contingencies - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 04, 2019 USD ($)	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Number of properties subject to ground leases | property		8		8
Operating lease right-of-use asset		$ 49,274		$ 49,274
Operating lease liability		$ 23,547		$ 23,547
Weighted average remaining lease term		33 years 3 months 18 days		33 years 3 months 18 days
Weighted average discount rate		4.33%		4.33%
Payments		$ 300		$ 1,000
Expense		$ 300		1,000
Rent expense			$ 400		$ 1,100
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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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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Present value of lessee's discounted obligation for lease payments from operating lease.

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