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Investments in Real Estate - Properties with Existing Leases (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) property | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($)
Net decrease to rental revenue |  |  |
2019 | $ (17,550) |  |
2020 | (16,820) |  |
2021 | (15,622) |  |
2022 | (13,918) |  |
2023 | (12,504) |  |
Thereafter | (36,911) |  |
Totals | (113,325) |  |
Increase to amortization expense |  |  |
2019 | 99,057 |  |
2020 | 93,337 |  |
2021 | 85,174 |  |
2022 | 73,577 |  |
2023 | 63,422 |  |
Thereafter | 360,839 |  |
Totals | 775,406 |  |
In-Place Leases |  |  |
Investments in real estate properties |  |  |
Depreciation and amortization expense | 106,600 | $ 104,800 | $ 94,000
Rental Revenue |  |  |
Investments in real estate properties |  |  |
Amortization of above and below Market Leases | 16,900 | 14,000 | $ 9,300
Real Estate Investment | New and under development or expansion |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 1,800,000 | $ 1,520,000 |
Number of properties acquired during the period | property | 764 | 303 |
Real Estate Investment | New and under development or expansion | In-Place Leases |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 425,500 | $ 1,100,000 |
Number of properties acquired during the period | property | 205 | 178 |

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