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Investments in Joint Ventures (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |
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Jun. 30, 2012 sqft IndustrialProperty | Jun. 30, 2011 | Jun. 30, 2012 sqft IndustrialProperty | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 2003 Net Lease Joint Venture [Member] sqft IndustrialProperty | Feb. 13, 2012 2003 Net Lease Joint Venture [Member] IndustrialProperty | May 26, 2011 2003 Net Lease Joint Venture [Member] IndustrialProperty | Jun. 30, 2012 2007 Europe Joint Venture [Member] IndustrialProperty
Investments in Joint Ventures (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Equity Interest Acquired |  |  |  |  |  |  | 85.00% | 85.00% |
Number of industrial properties owned | 734 |  | 734 |  |  | 6 | 1 | 1 | 0
Equity interest |  |  |  |  |  |  |  |  | 10.00%
Gross Leasable Area (GLA) of industrial properties owned | 65,900,000 |  | 65,900,000 |  |  | 3,100,000 |  |  |
Investment in 2003 Net Lease Joint Venture | $ 1,258 |  | $ 1,258 |  | $ 1,674 | $ 1,258 |  |  |
Investments In Joint Ventures Other (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Receivables from joint ventures | 22 |  | 22 |  | 137 |  |  |  |
Fees received from joint ventures | $ 68 | $ 277 | $ 144 | $ 587 |  |  |  |  |

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- Definition For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph d -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 + Details
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