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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, 2017 USD ($) ft² Property | Dec. 31, 2016 USD ($) ft² Property | Dec. 31, 2015 USD ($) ft² Property
Real Estate Properties [Line Items] |  |  |  |
Number of industrial properties | Property |  | 488 |  |
Gross leasable area (GLA) of industrial properties | ft² |  | 60.2 |  |
Proceeds from sale of industrial properties | $ | [1] | $ 236,059 | $ 169,911 | $ 158,429
Gain on sale of real estate | $ | [1] | $ 131,269 | $ 68,202 | $ 48,906
Disposition Activity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of industrial properties | Property |  | 60 | 63 | 66
Gross leasable area (GLA) of industrial properties | ft² |  | 4.6 | 3.9 | 3.8
[1] | (A) Gross proceeds and gain on sale of real estate includes the sale of several land parcels for the years ended December 31, 2017 and 2015.

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- Definition Area of a real estate property. + References No definition available. + Details
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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The cash inflow from sale of buildings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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