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Real Estate Investments (Details) $ in Thousands, ft² in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² property site state item | Dec. 31, 2019 USD ($) ft² property item site state | Dec. 31, 2018 USD ($)
Real Estate Investments |  |  |
Number of Real Estate Properties | property | 1,129 | 821 |
Land Subject to Ground Leases | ft² | 22.7 | 14.6 |
Net Real Estate Investments | $ 3,304,179 | $ 2,218,592 |
Retail Net Lease Assets Purchased | item | 317 | 186 |
Payments to Acquire Property, Plant, and Equipment | $ 1,310,000 | $ 702,900 |
Number Of States Properties Located | state | 39 | 40 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (in year) | 11 years 3 months 18 days | 11 years 8 months 12 days |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land | $ 386,900 | $ 195,800 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings | 768,200 | 415,100 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 158,100 | $ 92,000 |
Number Of Development And Partner Capital Solutions Projects Completed | site | 9 | 8 |
Number of Development and Partner Capital Solutions Projects Construction | site | 3 |  |
Proceeds from Sale of Real Estate | $ 47,700 | $ 65,500 | $ 65,800
Gains on Sales of Investment Real Estate | 8,000 | 13,300 | 11,200
Provision for impairment | 4,137 | 1,609 | 2,319
Impaired Real Estate Estate Fair Value | $ 11,900 | $ 3,000 | $ 17,300

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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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