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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets |
| December 31, 2011
| Total Cost |  | Accumulated Amortization |  | Intangibles, net
In-place lease value | $ | 91,426 |  |  | $ | (55,498 | ) |  | $ | 35,928 |
Tenant relationship value | 72,813 |  |  | (45,114 | ) |  | 27,699 |
Above market leases acquired | 12,744 |  |  | (5,856 | ) |  | 6,888 |
Total | $ | 176,983 |  |  | $ | (106,468 | ) |  | $ | 70,515 |
Below market leases acquired | $ | 75,685 |  |  | $ | (40,579 | ) |  | $ | 35,106 |
| December 31, 2010
| Total Cost |  | Accumulated Amortization |  | Intangibles, net
In-place lease value | $ | 108,456 |  |  | $ | (63,010 | ) |  | $ | 45,446 |
Tenant relationship value | 95,385 |  |  | (52,113 | ) |  | 43,272 |
Above market leases acquired | 18,319 |  |  | (9,575 | ) |  | 8,744 |
Total | $ | 222,160 |  |  | $ | (124,698 | ) |  | $ | 97,462 |
Below market leases acquired | $ | 67,198 |  |  | $ | (37,965 | ) |  | $ | 29,233 |
Annual amortization of intangible assets and liabilities |
| Assets |  | Liabilities
2012 | $ | 20,457 |  |  | $ | 6,826 |
2013 | 12,457 |  |  | 6,312 |
2014 | 9,606 |  |  | 4,745 |
2015 | 7,207 |  |  | 2,597 |
2016 | 4,565 |  |  | 1,704 |
Thereafter | 16,223 |  |  | 12,922 |
Total | $ | 70,515 |  |  | $ | 35,106 |

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- Definition Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. 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Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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