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Summary of Significant Accounting Policies (Real Estate Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items] |  |  |
Net amortization expense of acquired intangibles | $ 10,550 | $ 7,137 | $ 8,224
Intangible Assets Disclosure [Text Block] |  | December 31, 2011 |
Future Amortization Expense, 2013 | 17,488 |  |
Future Amortization Expense, 2014 | 13,921 |  |
Future Amortization Expense, 2015 | 10,885 |  |
Future Amortization Expense, 2016 | 6,541 |  |
Future Amortization Expense, 2017 | 4,848 |  |
Interest expense capitalized | 2,671 | 4,955 | 3,334
Building [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 40 |  |
Improvements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 10 to 20 |  |
Equipment and Fixtures [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, Plant and Equipment, Estimated Useful Lives | 7 to 10 |  |
Other Assets [Member] | Above Market Leases [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Intangible Assets, Cost | 69,360 | 55,642 |
Acquired Intangible Assets, Accumulated Amortization | (37,454) | (33,954) |
Other Assets [Member] | Intangible Leases, Acquired-in-Place [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Intangible Assets, Cost | 117,631 | 54,838 |
Acquired Intangible Assets, Accumulated Amortization | (46,767) | (36,753) |
Other Assets [Member] | Intangible Leases, Tenant Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Intangible Assets, Cost | 27,880 | 27,318 |
Acquired Intangible Assets, Accumulated Amortization | (3,350) | (2,853) |
Other Liabilities [Member] | Intangible Leases, Acquired-in-Place, Market Adjustment [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Intangible Assets, Cost | 104,012 | 66,627 |
Acquired Intangible Assets, Accumulated Amortization | $ (57,625) | $ (51,755) |

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- Definition The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). 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 Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -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. + Details
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