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Schedule III - Real Estate and Accumulated Depreciation and Amortization - (Parenthetical) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) Property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Land, buildings, and leasehold interests: |  |  |
Beginning balance | $ 8,534,275 | $ 8,448,702 | $ 7,883,633
Acquisitions and dollars invested in projects under construction and tenant improvements | 551,287 | 177,901 | 733,376
Dispositions | (146,019) | (54,886) | (138,332)
Impairment losses | (21,957) | (37,442) | (29,975)
Ending balance | 8,917,586 | 8,534,275 | 8,448,702
Accumulated depreciation and amortization: |  |  |
Beginning balance | 1,319,943 | 1,151,667 | 1,016,271
Dispositions | (44,509) | (17,828) | (44,185)
Depreciation and amortization expense | 195,959 | 186,104 | 179,581
Ending balance | 1,471,393 | 1,319,943 | $ 1,151,667
Net investment in direct financing leases | 3,653 | 3,994 |
Real estate, federal income tax basis | 8,828,431 |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | 10,697 | $ 11,395 |
Mortgages [Member] |  |  |
Accumulated depreciation and amortization: |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | 10,719 |  |
Mortgage Agreement |  |  |
Accumulated depreciation and amortization: |  |  |
Mortgages payable, including unamortized premium and net of unamortized debt costs | 15,151 |  |
Unamortized Discount (Premium) and Debt Issuance Costs | $ 10,697 |  |
Mortgage Agreement | Mortgages [Member] |  |  |
Accumulated depreciation and amortization: |  |  |
Number Of Properties Securing Mortgages Payable | Property | 5 |  |

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