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Real Estate Portfolio (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) ft² site state | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) ft² state
Real Estate Portfolio |  |  |
Number of Real Estate Properties | 868 |  | 821
Number of states | state | 46 |  | 46
Land Subject to Ground Leases | ft² | 16,300,000 |  | 14,600,000
Net Real Estate Investments | $ 2,397,615,000 |  | $ 2,218,592,000
Payments to Acquire Property, Plant, and Equipment | $ 227,000,000.0 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 11 years |  |
Deferred Revenue | $ 2,100,000 |  | $ 4,100,000
Retail Net Lease Assets Purchased | 51 |  |
Number of Development and Partner Capital Solutions Projects Construction | 1 |  |
Number Of States Properties Located | 24 |  |
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent |  | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 63,000,000.0 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 144,700,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 19,300,000 |  |
Number of properties sold | 6 |  |
Proceeds from Sale of Real Estate | $ 24,400,000 |  |
Gains (Losses) on Sales of Investment Real Estate | 1,600,000 |  |
Provision for impairment | $ 0 | $ 416,000 |
Impaired Real Estate Estate Fair Value |  | $ 600,000 |

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