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Intangible Assets on Real Estate Acquisitions (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 Y | Sep. 30, 2011 | Dec. 31, 2011
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | $ 204,465,000 |  | $ 221,168,000
Accumulated Amortization | 123,406,000 |  | 132,048,000
Net Carrying Amount | 81,059,000 |  | 89,120,000
Amortization of the intangible assets | 16,200,000 | 20,700,000 |
Weighted average amortization periods of intangible assets (in years) | 10 |  |
Estimated future amortization expense associated with the intangible asset categories for the next five years |  |  |
Three months ending December 31, 2012 | 4,300,000 |  |
2013 | 14,300,000 |  |
2014 | 12,300,000 |  |
2015 | 10,600,000 |  |
2016 | 9,500,000 |  |
2017 | 7,100,000 |  |
In-place lease value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 134,964,000 |  | 151,361,000
Accumulated Amortization | 89,808,000 |  | 97,594,000
Net Carrying Amount | 45,156,000 |  | 53,767,000
Weighted average amortization periods of intangible assets (in years) | 7 |  |
Tenant relationship value |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 46,827,000 |  | 45,940,000
Accumulated Amortization | 22,192,000 |  | 23,246,000
Net Carrying Amount | 24,635,000 |  | 22,694,000
Weighted average amortization periods of intangible assets (in years) | 8 |  |
Above-market cost arrangements |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 12,416,000 |  | 12,416,000
Accumulated Amortization | 3,789,000 |  | 2,857,000
Net Carrying Amount | 8,627,000 |  | 9,559,000
Weighted average amortization periods of intangible assets (in years) | 27 |  |
Above-market leases |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 8,925,000 |  | 10,118,000
Accumulated Amortization | 7,278,000 |  | 8,037,000
Net Carrying Amount | 1,647,000 |  | 2,081,000
Weighted average amortization periods of intangible assets (in years) | 4 |  |
Market concentration premium |  |  |
Intangible assets on real estate acquisitions |  |  |
Gross Carrying Amount | 1,333,000 |  | 1,333,000
Accumulated Amortization | 339,000 |  | 314,000
Net Carrying Amount | $ 994,000 |  | $ 1,019,000
Weighted average amortization periods of intangible assets (in years) | 30 |  |

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