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Schedule III: Real Estate and Accumulated Depreciation (Parenthetical) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 488 |  |  |
Tenant improvements, useful life | Lease Term |  |  |
Balance, Beginning of Year | $ 3,388,611 |  | $ 3,297,649 | $ 3,183,369
Acquisition of Real Estate Assets | 168,517 |  | 108,538 | 161,074
Construction Costs and Improvements | 137,361 |  | 167,342 | 142,535
Disposition of Real Estate Assets | (170,928) |  | (153,364) | (162,636)
Impairment of Real Estate | 0 |  | 0 | (626)
Write-off of Fully Depreciated and Other Assets | (27,816) |  | (31,554) | (26,067)
Balance, End of Year Including Real Estate Held for Sale | 3,495,745 |  | 3,388,611 | 3,297,649
Real Estate Held for Sale | 0 | [1] | (3,697) | (3,681)
Balance, End of Year Excluding Real Estate Held for Sale | 3,495,745 |  | 3,384,914 | 3,293,968
Balance, Beginning of Year | 797,919 |  | 792,501 | 786,978
Depreciation for Year | 94,078 |  | 95,514 | 92,955
Disposition of Assets | (78,844) |  | (62,634) | (61,365)
Write-off of Fully Depreciated and Other Assets | (23,234) |  | (27,462) | (26,067)
Balance, End of Year Including Real Estate Held for Sale | 789,919 |  | 797,919 | 792,501
Real Estate Held for Sale | 0 | [2] | (1,427) | (1,171)
Balance, End of Year Excluding Real Estate Held for Sale | $ 789,919 |  | $ 796,492 | $ 791,330
Buildings and Improvements | Minimum |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Property, plant and equipment, useful life | 7 years |  |  |
Buildings and Improvements | Maximum |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Property, plant and equipment, useful life | 50 years |  |  |
Land Improvements | Minimum |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years |  |  |
Land Improvements | Maximum |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Property, plant and equipment, useful life | 20 years |  |  |
5570 Tulane Dr [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 1,976 |  |  |
825-827 Avenue H [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 1,603 |  |  |
1172-84 113th Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 1,312 |  |  |
1200-16 Avenue H [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 1,295 |  |  |
8200 East Park Meadows Drive [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 3,666 |  |  |
3250 Quentin Street [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 3,311 |  |  |
1908-2000 Innerbelt [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 2 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 4,783 |  |  |
1322-66 W. North Carrier Parkway [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 3 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 2,469 |  |  |
Plano Crossing Bus. Park [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 4 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 4,611 |  |  |
801-831 S Great Southwest Pkwy [Member] |  |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |  |
Number of industrial properties | Property | 5 |  |  |
Balance, End of Year Including Real Estate Held for Sale | $ 10,466 |  |  |
[1] | The Real Estate Held for Sale at December 31, 2017 excludes $0 of other assets.
[2] | The Real Estate Held for Sale at December 31, 2017 excludes $0 of accumulated amortization related to the other assets mentioned above.

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