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Intangible Assets and Liabilities (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Deferred financing and leasing costs, net | $ 129,311,000 |  | $ 129,311,000 |  | $ 85,001,000
Amortization of intangible assets and liabilities [Abstract] |  |  |  |  |
Amortization of deferred financing costs | 806,000 | 858,000 | 2,448,000 | 2,528,000 |
Amortization of deferred leasing costs and acquisition-related intangible assets (in depreciation and amortization) | 5,188,000 | 3,912,000 | 13,945,000 | 11,495,000 |
Amortization of lease incentives (in rental and other revenues) | 368,000 | 270,000 | 1,009,000 | 807,000 |
Amortization of acquisition-related intangible assets (in rental and other revenues) | 240,000 | 200,000 | 618,000 | 318,000 |
Amortization of acquisition-related intangible liabilities (in rental and other revenues) | (229,000) | (27,000) | (280,000) | (69,000) |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |  |  |
Deferred financing costs (in years) | 3.9 |  | 3.9 |  |
Amortization of deferred leasing costs and acquisition-related intangible assets (in depreciation and amortization) (in years) | 6.4 |  | 6.4 |  |
Lease incentives (in rental and other revenues) (in years) | 8.1 |  | 8.1 |  |
Amortization of acquisition-related intangible assets (in rental and other revenues) (in years) | 5.8 |  | 5.8 |  |
Amortization of acquisition-related intangible liabilities (in rental and other revenues) (in years) | 8.8 |  | 8.8 |  |
Intangible assets and liabilities from new acquisitions [Abstract] |  |  |  |  |
Acquired above market lease intangible assets | 1,600 |  |  |  |
Acquired in-place lease intangible assets | 38,100 |  |  |  |
Assumed below market lease intangible liabilities | 15,600 |  |  |  |
Weighted average amortization periods, above market (in years) | 5.4 |  | 5.4 |  |
Weighted average amortization periods, in-place (in years) | 6.7 |  | 6.7 |  |
Weighted average amortization periods, below market (in years) | 8.8 |  | 8.8 |  |
Deferred Financing Costs [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, gross | 19,168,000 |  | 19,168,000 |  | 16,412,000
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, accumulated amortization | (6,192,000) |  | (6,192,000) |  | (7,054,000)
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, net | 12,976,000 |  | 12,976,000 |  | 9,358,000
Deferred Leasing Costs [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, gross | 171,093,000 |  | 171,093,000 |  | 127,949,000
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, accumulated amortization | (54,758,000) |  | (54,758,000) |  | (52,306,000)
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, net | 116,335,000 |  | 116,335,000 |  | 75,643,000
Acquisition-Related Intangible Liabilities [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, gross | 16,455,000 |  | 16,455,000 |  | 658,000
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, accumulated amortization | (425,000) |  | (425,000) |  | (125,000)
Deferred financing costs, deferred leasing costs and acquisition-related intangible liabilities, net | 16,030,000 |  | 16,030,000 |  | 533,000
Acquisition Related Intangible Assets Amortization Recorded in Rental and Other Revenues [Member] |  |  |  |  |
Scheduled future amortization of intangible assets and liabilities |  |  |  |  |
October 1, 2011 through December 31, 2011 |  |  | 271,000 |  |
2012 |  |  | 1,049,000 |  |
2013 |  |  | 802,000 |  |
2014 |  |  | 505,000 |  |
2015 |  |  | 335,000 |  |
Thereafter |  |  | 1,103,000 |  |
Total future amortization of intangible assets and liabilities |  |  | 4,065,000 |  |
Acquisition Related Intangible Liabilities Amortization Recorded in Rental and Other Revenues [Member] |  |  |  |  |
Scheduled future amortization of intangible assets and liabilities |  |  |  |  |
October 1, 2011 through December 31, 2011 |  |  | (141,000) |  |
2012 |  |  | (556,000) |  |
2013 |  |  | (542,000) |  |
2014 |  |  | (467,000) |  |
2015 |  |  | (421,000) |  |
Thereafter |  |  | (13,903,000) |  |
Total future amortization of intangible assets and liabilities |  |  | (16,030,000) |  |
Deferred Financing Costs Amortization Recorded in Interest Expense[Member] |  |  |  |  |
Scheduled future amortization of intangible assets and liabilities |  |  |  |  |
October 1, 2011 through December 31, 2011 |  |  | 931,000 |  |
2012 |  |  | 3,192,000 |  |
2013 |  |  | 2,956,000 |  |
2014 |  |  | 2,660,000 |  |
2015 |  |  | 2,064,000 |  |
Thereafter |  |  | 1,173,000 |  |
Total future amortization of intangible assets and liabilities |  |  | 12,976,000 |  |
Deferred Leasing Costs and Acquisition-Related Intangible Assets Amortization Recorded in Depreciation and Amortization [Member] |  |  |  |  |
Scheduled future amortization of intangible assets and liabilities |  |  |  |  |
October 1, 2011 through December 31, 2011 |  |  | 6,263,000 |  |
2012 |  |  | 22,604,000 |  |
2013 |  |  | 17,849,000 |  |
2014 |  |  | 13,609,000 |  |
2015 |  |  | 9,950,000 |  |
Thereafter |  |  | 35,214,000 |  |
Total future amortization of intangible assets and liabilities |  |  | 105,489,000 |  |
Lease Incentives Amortization Recorded in Rental and Other Revenues [Member] |  |  |  |  |
Scheduled future amortization of intangible assets and liabilities |  |  |  |  |
October 1, 2011 through December 31, 2011 |  |  | 323,000 |  |
2012 |  |  | 1,234,000 |  |
2013 |  |  | 1,080,000 |  |
2014 |  |  | 913,000 |  |
2015 |  |  | 695,000 |  |
Thereafter |  |  | 2,536,000 |  |
Total future amortization of intangible assets and liabilities |  |  | $ 6,781,000 |  |

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- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + Details
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- Definition This element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. + Details
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- Definition The average useful life of all identifiable intangible assets established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. + Details
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- Definition The average useful life of all identifiable intangible liabilities established upon acquisition based on an unfavorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. + Details
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- Definition Accumulated amortization of (1) the carrying amount of capitalized costs associated with the issuance of debt instruments, (2) initial direct leasing costs incurred by the lessor, (3) identifiable intangible assets established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date and (4) liabilities associated with the acquisition of off-market leases. + Details
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- Definition This element represents the gross amount of (1) the carrying amount of capitalized costs associated with the issuance of debt instruments, (2) initial direct leasing costs incurred by the lessor, (3) identifiable intangible assets established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date and (4) liabilities associated with the acquisition of off-market leases. + Details
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- Definition This element represents the net amount of (1) the carrying amount of capitalized costs associated with the issuance of debt instruments, (2) initial direct leasing costs incurred by the lessor, (3) identifiable intangible assets established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date and (4) liabilities associated with the acquisition of off-market leases. + 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. + Details
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- Definition Weighted average remaining amortization period for acquisition-related intangible assets for which related amortization expense is included in rental and other revenues. + Details
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- Definition Weighted average remaining amortization period for deferred leasing costs and acquisition-related intangible assets for which related amortization expense is included in depreciation and amortization. + Details
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- Definition The component of interest expense comprised of the periodic charge against earnings over the life of the financing arrangement to which such costs relate. Alternate captions include Noncash Interest Expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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