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Investments in Real Estate - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Real Estate [Line Items] |  |
Buildings and building improvements | $ 3,144,176 | $ 2,962,982
Land, land estates and land improvements | 367,272 | 355,697
Construction in progress | 3,116 | 1,895
Real estate - intangible assets | 409,293 | 409,756
Investments in real estate under construction | 75,906 | 13,313
Real estate, gross | 3,999,763 | 3,743,643
Accumulated depreciation and amortization | (884,465) | (887,629)
Real estate, net | 3,115,298 | 2,856,014
Accumulated amortization | 199,997 | 212,033
Amortization expense, next 12 months | 32,240 |
Amortization expense, year 2 | 30,559 |
Amortization expense, year 3 | 29,560 |
Amortization expense, year 4 | 23,801 |
Amortization expense, year 5 | 19,802 |
In-place lease values |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | 357,640 | 339,154
Tenant relationships |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | 33,327 | 42,396
Above-market leases |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | $ 18,326 | $ 28,206

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