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Real Estate Investments (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) ft² property item state | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) ft² item property state | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) ft² state
Real Estate Investments |  |  |  |  |
Number of Real Estate Properties | 1,027 |  | 1,027 |  | 821
Number of states | state | 45 |  | 45 |  | 46
Land Subject to Ground Leases | ft² | 21,000,000.0 |  | 21,000,000.0 |  | 14,600,000
Net Real Estate Investments | $ 3,015,606,000 |  | $ 3,015,606,000 |  | $ 2,218,592,000
Retail Net Lease Assets Purchased | 91 |  | 217 |  |
Payments to Acquire Property, Plant, and Equipment | $ 458,800,000 |  | $ 958,300,000 |  |
Number Of States Properties Located | 26 |  | 35 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 11 years 6 months |  | 11 years 2 months 12 days |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 248,200,000 |  | $ 248,200,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 588,600,000 |  | 588,600,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 97,000,000.0 |  | 97,000,000.0 |  |
Aggregate acquisitions of right use of asset | $ 24,500,000 |  | $ 24,500,000 |  |
Number of Contracts or Customers Comprising Ten Percent or More Of Company's Total Assets or Total Rent |  |  | 0 |  |
Number Of Development And Partner Capital Solutions Projects Completed | item | 2 |  | 6 |  |
Number of Development and Partner Capital Solutions Projects Construction | item |  |  | 4 |  |
Number of properties sold | property | 2 |  | 16 |  |
Proceeds from Sale of Real Estate | $ 3,400,000 |  | $ 46,000,000.0 |  |
Gains (Losses) on Sales of Investment Real Estate | 1,000,000.0 |  | 7,600,000 |  |
Provision for impairment | 2,868,000 | $ 0 | 3,996,000 | $ 1,609,000 |
Impaired Real Estate Estate Fair Value | $ 4,500,000 |  | $ 4,500,000 |  |

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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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