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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |
Lessor, Operating Leases, ASC 842 Disclosure | The following table sets forth the undiscounted cash flows for future minimum base rents to be received from customers for leases in effect at December 31, 2020 for the properties that we wholly own:
2021 |  | $ | 623,888 |
2022 |  | 619,530 |
2023 |  | 570,417 |
2024 |  | 513,483 |
2025 |  | 432,272 |
Thereafter |  | 2,049,545 |
|  | $ | 4,809,135 |
Allowance For Doubtful Accounts |  | The following table sets forth the activity of allowance for doubtful accounts:
| Balance at December 31, 2017 |  | Additions |  | Deductions |  | Balance at December 31, 2018
Allowance for Doubtful Accounts - Straight-Line Rent | $ | 819 |  |  | $ | 599 |  |  | $ | (777) |  |  | $ | 641 |
Allowance for Doubtful Accounts - Accounts Receivable | 753 |  |  | 969 |  |  | (556) |  |  | 1,166 |
Allowance for Doubtful Accounts - Notes Receivable | 72 |  |  | — |  |  | (28) |  |  | 44 |
Totals | $ | 1,644 |  |  | $ | 1,568 |  |  | $ | (1,361) |  |  | $ | 1,851 |
Lessee, Operating Leases, ASC 842 Disclosure | The following table sets forth the undiscounted cash flows of our scheduled obligations for future minimum payments on operating ground leases at December 31, 2020 and a reconciliation of those cash flows to the operating lease liability at December 31, 2020:
2021 |  | $ | 2,127 |
2022 |  | 2,169 |
2023 |  | 2,167 |
2024 |  | 2,123 |
2025 |  | 2,170 |
Thereafter |  | 81,527 |
|  | 92,283 |
Discount |  | (57,892) |
Lease liability |  | $ | 34,391 |

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981 + Details
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