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Investment in Real Estate Inestment in Real Estate - Summary of Industrial Property Dispositions (Details) $ in Thousands, ft² in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) ft² Property | Dec. 31, 2019 USD ($) ft² Property | Dec. 31, 2018 USD ($) ft² Property
Real Estate Properties [Line Items] |  |  |  |
Number of industrial properties | Property |  | 427 |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 62.8 |  |
Proceeds from sale of industrial properties | [1] | $ 153,351 | $ 315,768 | $ 192,047
Gain on sale of real estate | [1] | 86,751 | $ 124,942 | 81,600
Sales Type Lease |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Gross leasable area (GLA) of industrial properties | ft² |  |  | 0.6 |
Sales-type Lease, Selling Profit (Loss) |  | 0 | $ 8,606 | 0
Sales-type Lease, Lease Receivable |  | $ 0 | $ 54,521 | $ 0
Disposition Activity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of industrial properties | Property | [2] | 29 | 40 | 53
Gross leasable area (GLA) of industrial properties | ft² |  | 1.9 | 5.9 | 2.6
Partial Disposition Activity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of industrial properties | Property |  | 1 |  |
[1] | (B) Gross proceeds and gain on sale of real estate include the sale of several land parcels for the years ended December 31, 2019 and 2018. In addition, included in the above table for the year ended December 31, 2019, is 0.6 million square feet of GLA, gross proceeds of $54,521 and gain on sale of $8,606 related to the reclassification of a lease from an operating lease to a sales-type lease that was recorded as a lease receivable as of December 31, 2019 and collected during 2020. See Note 10 for additional information.
[2] | (A) Included as one industrial property for each of the years ended December 31, 2020 and 2019 is the sale of multiple industrial condominium units.

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: 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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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- Definition Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981 + Details
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