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Investments in Real Estate - Schedule of Net Real Estate (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Real Estate [Line Items] |  |
Buildings and building improvements | $ 2,962,982 | $ 2,746,446
Land, land estates and land improvements | 355,697 | 341,848
Construction in progress | 1,895 | 1,840
Real estate - intangible assets | 409,756 | 419,612
Investments in real estate under construction | 13,313 | 0
Real estate, gross | 3,743,643 | 3,509,746
Accumulated depreciation and amortization | (887,629) | (954,087)
Real estate, net | 2,856,014 | 2,555,659
Accumulated amortization | 212,033 | 231,443
Amortization expense, next 12 months | 28,634 |
Amortization expense, year 2 | 26,647 |
Amortization expense, year 3 | 24,640 |
Amortization expense, year 4 | 23,487 |
Amortization expense, year 5 | 18,270 |
In-place lease values |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | 339,154 | 331,607
Tenant relationships |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | 42,396 | 54,662
Above-market leases |  |
Real Estate [Line Items] |  |
Real estate - intangible assets | $ 28,206 | $ 33,343

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