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Investments in Real Estate - Schedule of Acquisitions (Details) $ in Thousands, £ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² property state | Dec. 31, 2020 GBP (£) ft² property state | Dec. 31, 2019 USD ($) ft² property state | Dec. 31, 2019 GBP (£) ft² property state
Real Estate [Line Items] |  |  |  |
Number of properties | property | 244 | 244 | 789 | 789
Leasable square feet (sq ft) | ft² | 9,197,360 | 9,197,360 | 13,736,272 | 13,736,272
Investment | $ | $ 2,307,281 |  | $ 3,715,237 |
Weighted average lease term (years) | 13 years 2 months 12 days | 13 years 2 months 12 days | 13 years 6 months | 13 years 6 months
Initial average cash lease yield (percent) | 5.90% | 5.90% | 6.40% | 6.40%
New properties |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties, new | property | 226 | 226 | 771 | 771
Leasable square feet (sq ft) | ft² | 7,596,265 | 7,596,265 | 13,214,099 | 13,214,099
Investment | $ | $ 2,223,154 |  | $ 3,658,652 |
Weighted average lease term (years) | 13 years 2 months 12 days | 13 years 2 months 12 days | 13 years 4 months 24 days | 13 years 4 months 24 days
Initial average cash lease yield (percent) | 5.90% | 5.90% | 6.40% | 6.40%
New properties | U.S. |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties, new | property | 202 | 202 | 753 | 753
Number of states | state | 30 | 30 | 45 | 45
Leasable square feet (sq ft) | ft² | 5,476,009 | 5,476,009 | 11,630,423 | 11,630,423
Investment | $ | $ 1,302,220 |  | $ 2,860,806 |
Weighted average lease term (years) | 14 years 10 months 24 days | 14 years 10 months 24 days | 13 years | 13 years
Initial average cash lease yield (percent) | 5.80% | 5.80% | 6.80% | 6.80%
New properties | U.K. |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties, new | property | 24 | 24 | 18 | 18
Leasable square feet (sq ft) | ft² | 2,120,256 | 2,120,256 | 1,583,676 | 1,583,676
Investment | $ 920,934 | £ 707.8 | $ 797,846 | £ 625.8
Weighted average lease term (years) | 10 years 9 months 18 days | 10 years 9 months 18 days | 15 years 7 months 6 days | 15 years 7 months 6 days
Initial average cash lease yield (percent) | 6.10% | 6.10% | 5.20% | 5.20%
Properties under development | U.S. |  |  |  |
Real Estate [Line Items] |  |  |  |
Number of properties, under development | property | 18 | 18 | 18 | 18
Leasable square feet (sq ft) | ft² | 1,601,095 | 1,601,095 | 522,173 | 522,173
Investment | $ | $ 84,127 |  | $ 56,585 |
Weighted average lease term (years) | 15 years 3 months 18 days | 15 years 3 months 18 days | 15 years 1 month 6 days | 15 years 1 month 6 days
Initial average cash lease yield (percent) | 5.60% | 5.60% | 7.30% | 7.30%

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- Definition For new properties during the period, the weighted average contractual lease rate computed as estimated contractual net operating income (in a net-leased property that is equal to the aggregate base rent or, in the case of properties under development, the estimated aggregate base rent under the lease) for the first year of each lease, divided by the estimated total cost of the properties. + References No definition available. + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
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