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Intangible Assets Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Intangible Assets [Line Items] |  |
Total Cost | $ 142,738 | $ 152,611
Accumulated Amortization | (76,634) | (81,991)
Intangible Assets, net | 66,104 | 70,620
In-place lease value |  |
Intangible Assets [Line Items] |  |
Total Cost | 83,905 | 87,909
Accumulated Amortization | (41,743) | (42,894)
Intangible Assets, net | 42,162 | 45,015
Tenant relationship value |  |
Intangible Assets [Line Items] |  |
Total Cost | 50,268 | 56,137
Accumulated Amortization | (33,019) | (37,389)
Intangible Assets, net | 17,249 | 18,748
Above market leases acquired |  |
Intangible Assets [Line Items] |  |
Total Cost | 8,565 | 8,565
Accumulated Amortization | (1,872) | (1,708)
Intangible Assets, net | 6,693 | 6,857
Below market leases acquired |  |
Intangible Assets [Line Items] |  |
Total Cost | 76,892 | 77,083
Accumulated Amortization | (44,990) | (43,224)
Intangible Assets, net | $ 31,902 | $ 33,859

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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