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Intangible Assets Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets [Table Text Block] | As of March 31, 2013 and December 31, 2012, the Company’s intangible assets were comprised of the following (in thousands):
| March 31, 2013
| Total Cost |  | Accumulated Amortization |  | Intangible assets, net
In-place lease value | $ | 83,905 |  |  | $ | (41,743 | ) |  | $ | 42,162 |
Tenant relationship value | 50,268 |  |  | (33,019 | ) |  | 17,249 |
Above market leases acquired | 8,565 |  |  | (1,872 | ) |  | 6,693 |
Total | $ | 142,738 |  |  | $ | (76,634 | ) |  | $ | 66,104 |
Below market leases acquired | $ | 76,892 |  |  | $ | (44,990 | ) |  | $ | 31,902 |
| December 31, 2012
| Total Cost |  | Accumulated Amortization |  | Intangible assets, net
In-place lease value | $ | 87,909 |  |  | $ | (42,894 | ) |  | $ | 45,015 |
Tenant relationship value | 56,137 |  |  | (37,389 | ) |  | 18,748 |
Above market leases acquired | 8,565 |  |  | (1,708 | ) |  | 6,857 |
Total | $ | 152,611 |  |  | $ | (81,991 | ) |  | $ | 70,620 |
Below market leases acquired | $ | 77,083 |  |  | $ | (43,224 | ) |  | $ | 33,859 |
Annual Amortization For Its Intangible Assets Liabilities [Table Text Block] | As of March 31, 2013, the Company’s annual amortization for its intangible assets/liabilities were as follows (in thousands, and assuming no early lease terminations):
| Assets |  | Liabilities
2013 | $ | 11,562 |  |  | $ | 5,715 |
2014 | 12,871 |  |  | 6,081 |
2015 | 10,494 |  |  | 3,914 |
2016 | 6,166 |  |  | 1,974 |
2017 | 4,894 |  |  | 1,445 |
Thereafter | 20,117 |  |  | 12,773 |
Total | $ | 66,104 |  |  | $ | 31,902 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 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=7658586&loc=d3e16265-109275 + Details
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