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Leases ASC 840 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Allowance For Doubtful Accounts [Roll Forward] |  |
Allowance for doubtful accounts, beginning balance | $ 1,644 | $ 1,421
Additions to allowance for doubtful accounts | 1,568 | 2,003
Deductions to allowance for doubtful accounts | (1,361) | (1,780)
Allowance for doubtful accounts, ending balance | 1,851 | 1,644
Operating leases, scheduled future minimum payments receivable [Abstract] |  |
2019 | 618,014 |
2020 | 581,399 |
2021 | 524,381 |
2022 | 488,157 |
2023 | 428,461 |
Thereafter | 2,068,891 |
Operating leases, total future minimum payments receivable due | 4,709,303 |
Leases, Operating [Abstract] |  |
Total rental property expense recorded for operating ground leases | 2,500 | 2,500
Operating ground leases, scheduled future minimum payments [Abstract] |  |
2019 | 2,184 |
2020 | 2,223 |
2021 | 2,263 |
2022 | 2,305 |
2023 | 2,308 |
Thereafter | 86,577 |
Operating ground leases, total future minimum payments due | 97,860 |
Allowance for Doubtful Accounts - Straight Line Rent [Member] |  |
Allowance For Doubtful Accounts [Roll Forward] |  |
Allowance for doubtful accounts, beginning balance | 819 | 692
Additions to allowance for doubtful accounts | 599 | 1,503
Deductions to allowance for doubtful accounts | (777) | (1,376)
Allowance for doubtful accounts, ending balance | 641 | 819
Allowance for Doubtful Accounts - Accounts Receivable [Member] |  |
Allowance For Doubtful Accounts [Roll Forward] |  |
Allowance for doubtful accounts, beginning balance | 753 | 624
Additions to allowance for doubtful accounts | 969 | 500
Deductions to allowance for doubtful accounts | (556) | (371)
Allowance for doubtful accounts, ending balance | 1,166 | 753
Allowance for Doubtful Accounts - Notes Receivable [Member] |  |
Allowance For Doubtful Accounts [Roll Forward] |  |
Allowance for doubtful accounts, beginning balance | 72 | 105
Additions to allowance for doubtful accounts | 0 | 0
Deductions to allowance for doubtful accounts | (28) | (33)
Allowance for doubtful accounts, ending balance | $ 44 | $ 72

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