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Investments in Real Estate - Properties with Existing Leases (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($)
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 2,307,281 | $ 3,715,237 |
Number of properties | property | 244 | 789 |
Rental Revenue |  |  |
Investments in real estate properties |  |  |
Amortization of above and below market Leases | $ 30,900 | $ 22,100 | $ 16,900
In-Place Leases |  |  |
Investments in real estate properties |  |  |
Depreciation and amortization expense | 134,600 | 112,000 | $ 106,600
Real Estate Investment |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | 2,300,000 | 3,700,000 |
Real Estate Investment | Properties with existing leases | In-Place Leases |  |  |
Investments in real estate properties |  |  |
Value of properties acquired during the period | $ 1,860,000 | $ 2,720,000 |
Number of properties | property | 127 | 575 |

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- Definition Amount of non-cash amortization of intangible asset (liability) for above and below market leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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