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Intangible Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 years | Dec. 31, 2010 | Dec. 31, 2009
Intangible assets and liabilities, net [Abstract] |  |  |
Deferred financing and leasing costs, accumulated amortization | $ (63,156) | $ (59,360) |
Deferred financing and leasing costs, net | 128,585 | 85,001 |
Deferred Financing Costs [Member] |  |  |
Intangible assets and liabilities, net [Abstract] |  |  |
Deferred financing and leasing costs, gross | 18,044 | 16,331 |
Deferred financing and leasing costs, accumulated amortization | (5,797) | (7,031) |
Deferred financing and leasing costs, net | 12,247 | 9,300 |
Amortization of intangible assets and liabilities |  |  |
Amortization of intangible assets | 3,312 | 3,385 | 2,760
Scheduled future amortization of intangible assets and liabilities |  |  |
2012 | 3,386 |  |
2013 | 2,982 |  |
2014 | 2,682 |  |
2015 | 2,073 |  |
2016 | 704 |  |
Thereafter | 420 |  |
Total future amortization of intangible assets and liabilities | 12,247 |  |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |
Finite-lived intangible assets, average useful life (in years) | 3.7 |  |
Deferred Leasing Costs [Member] |  |  |
Intangible assets and liabilities, net [Abstract] |  |  |
Deferred financing and leasing costs, gross | 173,697 | 128,030 |
Deferred financing and leasing costs, accumulated amortization | (57,359) | (52,329) |
Deferred financing and leasing costs, net | 116,338 | 75,701 |
Amortization of intangible assets and liabilities |  |  |
Amortization of intangible assets | 20,980 | 17,383 | 15,064
Scheduled future amortization of intangible assets and liabilities |  |  |
2012 | 25,082 |  |
2013 | 20,503 |  |
2014 | 16,336 |  |
2015 | 12,411 |  |
2016 | 9,226 |  |
Thereafter | 22,095 |  |
Total future amortization of intangible assets and liabilities | 105,653 |  |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |
Finite-lived intangible assets, average useful life (in years) | 6.4 |  |
Deferred Lease Incentives [Member] |  |  |
Amortization of intangible assets and liabilities |  |  |
Amortization of intangible assets | 1,371 | 1,239 | 1,110
Scheduled future amortization of intangible assets and liabilities |  |  |
2012 | 1,291 |  |
2013 | 1,136 |  |
2014 | 973 |  |
2015 | 752 |  |
2016 | 579 |  |
Thereafter | 2,186 |  |
Total future amortization of intangible assets and liabilities | 6,917 |  |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |
Finite-lived intangible assets, average useful life (in years) | 8.0 |  |
Acquisition Related Intangible Assets [Member] |  |  |
Amortization of intangible assets and liabilities |  |  |
Amortization of intangible assets | 915 | 531 | 102
Scheduled future amortization of intangible assets and liabilities |  |  |
2012 | 1,054 |  |
2013 | 822 |  |
2014 | 527 |  |
2015 | 342 |  |
2016 | 281 |  |
Thereafter | 742 |  |
Total future amortization of intangible assets and liabilities | 3,768 |  |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |
Finite-lived intangible assets, average useful life (in years) | 5.8 |  |
Acquisition-Related Intangible Liabilities [Member] |  |  |
Intangible assets and liabilities, net [Abstract] |  |  |
Acquisition-related intangible liabilities, gross | 16,441 | 733 |
Acquisiton-related intangible liabilities, accumulated amortization | (971) | (200) |
Acquisition-related intangible liabilities, net | 15,470 | 533 |
Amortization of intangible assets and liabilities |  |  |
Amortization of acquisition-related intangible liabilities | (840) | (96) | (94)
Scheduled future amortization of intangible assets and liabilities |  |  |
2012 | (2,123) |  |
2013 | (2,094) |  |
2014 | (2,019) |  |
2015 | (1,808) |  |
2016 | (1,511) |  |
Thereafter | (5,915) |  |
Total future amortization of intangible assets and liabilities | $ (15,470) |  |
Weighted average remaining amortization periods for intangible assets and liabilities [Abstract] |  |  |
Finite-lived intangible liabilities, average useful life (in years) | 8.6 |  |

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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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