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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Change in estimate of uncollectable rental revenues   $ 41,955,000 $ 1,692,000
Accounts Receivable      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Change in estimate of uncollectable rental revenues $ 36,912,000 40,692,000  
Straight line rent receivables $ 1,088,000 $ 2,557,000