Summary of Significant Accounting Policies - Tenant Receivables and Deferred Rent Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Allowances and Security Obtained from Tenant [Line Items]
Letters of credit from our tenants	$ 27,749
Cash security deposits from our tenants	50,733		$ 60,923
Tenant Receivables
Allowances and Security Obtained from Tenant [Line Items]
Allowance for doubtful accounts	5,215
Increase (decrease) in net income from change in receivable allowance	(2,154)	$ (406)
Deferred Rent Receivables
Allowances and Security Obtained from Tenant [Line Items]
Allowance for doubtful accounts	2,849
Increase (decrease) in net income from change in receivable allowance	$ 556	$ 1,739