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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 |

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