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Intangible Assets (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible liabilities written off through accelerated amortization | $ 200,000 |  | $ 400,000
Intangible assets |  |  |
Total Cost | 176,983,000 | 222,160,000 |
Accumulated Amortization | (106,468,000) | (124,698,000) |
Intangibles, net | 70,515,000 | 97,462,000 |
Below market leases acquired | 35,106,000 | 29,233,000 |
Leases, Acquired-in-Place [Member] |  |  |
Intangible assets |  |  |
Total Cost | 91,426,000 | 108,456,000 |
Accumulated Amortization | (55,498,000) | (63,010,000) |
Intangibles, net | 35,928,000 | 45,446,000 |
Customer Relationships [Member] |  |  |
Intangible assets |  |  |
Total Cost | 72,813,000 | 95,385,000 |
Accumulated Amortization | (45,114,000) | (52,113,000) |
Intangibles, net | 27,699,000 | 43,272,000 |
Above market tenant leases acquired [Member] |  |  |
Intangible assets |  |  |
Total Cost | 12,744,000 | 18,319,000 |
Accumulated Amortization | (5,856,000) | (9,575,000) |
Intangibles, net | 6,888,000 | 8,744,000 |
Below market ground lease acquired [Member] |  |  |
Intangible assets |  |  |
Total Cost | 75,685,000 | 67,198,000 |
Accumulated Amortization | (40,579,000) | (37,965,000) |
Intangibles, net | 35,106,000 | 29,233,000 |
Tenant Move-Outs Prior to End of the Lease Term [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets written off through accelerated amortization | $ 7,400,000 | $ 1,500,000 | $ 2,400,000

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- Definition Intangible Liabilities Written Off Through Accelerated Amortization + References No definition available. + Details
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- Definition The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: 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of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: 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=6905858&loc=d3e16323-109275 + Details
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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: 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. Reference 2: 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=6905858&loc=d3e16323-109275 + Details
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- Definition The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: 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. Reference 2: 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=6905858&loc=d3e16323-109275 + Details
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- Definition This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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