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Real Estate and Intangible Assets (Details 5)
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3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Weighted average amortization period for the intangible assets acquired and liabilities assumed | ||
| Period for intangible assets and liabilities | 11 years 10 months 24 days | 16 years 8 months 12 days |
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In-place leases [Member]
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| Weighted average amortization period for the intangible assets acquired and liabilities assumed | ||
| Period for intangible assets and liabilities | 10 years 2 months 12 days | 15 years |
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Leasing costs [Member]
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| Weighted average amortization period for the intangible assets acquired and liabilities assumed | ||
| Period for intangible assets and liabilities | 10 years 2 months 12 days | 15 years |
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Customer relationships [Member]
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| Weighted average amortization period for the intangible assets acquired and liabilities assumed | ||
| Period for intangible assets and liabilities | 15 years 2 months 12 days | 20 years |