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Indebtedness (Details Textual) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended |
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Dec. 31, 2010 | Apr. 30, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Sep. 20, 2011 sqft | Sep. 15, 2011 | Dec. 31, 2011 Mortgage Financing I - VIII [Member] | Dec. 31, 2011 Mortgage Financing X [Member] | Dec. 31, 2011 Senior unsecured notes [Member] | Dec. 31, 2010 Senior unsecured notes [Member] | Dec. 31, 2011 Unsecured Credit Facility [Member] | Dec. 31, 2010 Unsecured Credit Facility [Member] | Oct. 22, 2010 Unsecured Credit Facility [Member] Revolving Line of Credit [Member] | Jun. 30, 2011 Unsecured Credit Facility [Member] Term Loan [Member] | Oct. 22, 2010 Unsecured Credit Facility [Member] Term Loan [Member]
Indebtedness (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding balance for calculating prepayment premium |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Prohibition period for principal prepayments of mortgage financings after loan origination |  |  |  |  |  |  |  | 12 months | 3 months |  |  |  |  |  |  |
Loss on Early Retirement of Debt |  |  | $ (5,459) | $ (4,304) | $ 34,562 |  |  |  |  | $ (2,012) | $ (4,096) |  |  |  |  |
Principal amount of senior notes repurchased |  |  |  |  |  |  |  |  |  | 112,757 | 264,796 |  |  |  |  |
Unamortized debt issue discount |  |  |  |  |  |  |  |  |  | 135 | 1,707 |  |  |  |  |
Permanent repayment on term loan for unsecured credit facility |  |  | 234,307 | 259,018 | 336,196 |  |  |  |  |  |  |  |  |  | 100,000 |
Amount of Unsecured Revolving Credit Agreement replacing Old Credit Facility |  |  | 450,000 |  |  |  |  |  |  |  |  |  |  | 200,000 |  | 200,000
Loss recognized on retirement of debt |  |  | 147 |  |  |  |  |  |  |  |  |  | 191 |  |  |
Unamortized deferred financing cost, wrote off | 1,172 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured credit facility maturity date |  |  |  |  |  |  |  | Jun. 01, 2018 | Oct. 01, 2021 |  |  | Sep. 28, 2012 |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.385% |  |  |  |
Increase in borrowing capacity under Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |
Additional Indebtedness (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan payable on real estate held for sale | 1,008 |  |  | 1,008 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized premiums | 48 |  |  | 48 |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of industrial properties held under mortgage and other loan |  |  | 889,722 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit, amount |  |  | 537 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price senior unsecured notes |  |  | 110,667 | 265,858 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan commitment and origination fee and unamortized discounts or premium |  |  | 717 | 519 |  |  |  |  |  |  |  |  |  |  |  |
Unamortized settlement amount of interest rate protection agreements |  |  | 3,250 | (183) |  |  |  |  |  |  |  |  |  |  |  |
Professional service fee |  |  | 0 | 991 |  |  |  |  |  |  |  |  |  |  |  |
Basis point in addition to LIBOR Interest rate under Unsecured Credit Facility |  |  | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of exchangeable notes at maturity |  |  |  |  |  |  | 128,900 |  |  |  |  |  |  |  |  |
Area of property transferred |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Escrow balance |  |  |  |  |  | 1,845 |  |  |  |  |  |  |  |  |  |
Non-recourse mortgage loan |  |  |  |  |  | 5,040 |  |  |  |  |  |  |  |  |  |
Amount of secured mortgage debt, prepaid and retired | 12,970 | 1,654 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayment fees (secured mortgage debt) |  | $ 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Carrying value of industrial properties held under mortgage and other loan. + References No definition available. + Details
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- Definition Debt instrument unamortized premium on mortgage loan payable on real estate held for sale. + References No definition available. + Details
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- Definition Loss recognized on retirement of debt. + References No definition available. + Details
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- Definition Mortgage loan payable on real estate held for sale. + References No definition available. + Details
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- Definition Percentage of outstanding balance for calculating prepayment premium. + References No definition available. + Details
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- Definition Prepayment fees (secured mortgage debt). + References No definition available. + Details
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- Definition Principal amount of senior notes repurchased. + References No definition available. + Details
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- Definition Prohibition period for principal prepayments of mortgage financings after loan origination. + References No definition available. + Details
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- Definition Purchase price senior unsecured notes. + References No definition available. + Details
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- Definition Repayment of mortgage secured loan. + References No definition available. + Details
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- Definition Unamortized loan commitment and origination fee and unamortized discounts or premium. + References No definition available. + Details
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- Definition Unamortized settlement amount of interest rate protection agreements. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6226653-111729 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6224234-111729 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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