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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Change in estimate of uncollectable rental revenues   $ 55,369 $ 1,504
Accounts Receivable      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Change in estimate of uncollectable rental revenues $ 13,771 54,463  
Straight line receivables $ 2,581 $ 5,137