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Investments in Real Estate - Properties with Existing Leases (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($)
Net decrease to rental revenue |  |  |
2018 | $ (16,527) |  |
2019 | (15,545) |  |
2020 | (14,776) |  |
2021 | (13,484) |  |
2022 | (11,753) |  |
Thereafter | (25,373) |  |
Totals | (97,458) |  |
Increase to amortization expense |  |  |
2018 | 104,612 |  |
2019 | 94,374 |  |
2020 | 88,679 |  |
2021 | 80,513 |  |
2022 | 69,700 |  |
Thereafter | 390,798 |  |
Totals | 828,676 |  |
In-Place Leases |  |  |
Investments in real estate properties |  |  |
Depreciation and amortization expense | 104,800 | $ 94,000 | $ 87,900
Rental Revenue |  |  |
Investments in real estate properties |  |  |
Amortization of above and below Market Leases | (14,000) | (9,300) | $ (7,900)
Real Estate Investment | New and under development or expansion |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 1,520,000 | $ 1,860,000 |
Number of properties acquired during the period | item | 303 | 505 |
Real Estate Investment | New and under development or expansion | In-Place Leases |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 1,100,000 | $ 748,900 |
Number of properties acquired during the period | item | 178 | 91 |

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