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Investments in Joint Ventures (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Condensed combined balance sheets |  |  |
Gross Real Estate Investment |  |  | $ 41,258
Less: Accumulated Depreciation | (658,729) | (509,634) |
Net Investment in Real Estate | 2,333,367 | 2,109,133 |
Total Assets | 2,666,657 | 2,750,054 |
Debt | 1,483,803 |  |
Total Liabilities and Equity | 2,666,657 | 2,750,054 |
Carrying Value of the Company's investments in Joint Ventures | 1,674 | 2,451 |
Corporate Joint Venture [Member] |  |  |
Condensed combined balance sheets |  |  |
Gross Real Estate Investment | 155,555 | 210,567 |
Less: Accumulated Depreciation | (41,342) | (47,286) |
Net Investment in Real Estate | 114,213 | 163,281 |
Other Assets | 23,364 | 33,351 |
Total Assets | 137,577 | 196,632 |
Debt | 112,261 | 157,431 |
Other Liabilities | 5,779 | 10,849 |
Equity | 19,537 | 28,352 |
Total Liabilities and Equity | 137,577 | 196,632 |
Company's share of Equity | 3,029 | 4,344 |
Basis Differentials | (1,564) | (2,089) |
Carrying Value of the Company's investments in Joint Ventures | $ 1,465 | $ 2,255 |

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- Definition The item represents the difference, if any, between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee. A difference can arise between the carrying value of the equity method investment and the value of the Entity's amount of underlying equity in net assets of the investee, for example, from appreciation of certain assets which is not recognized in earnings, but is recognized in other comprehensive income (a separate component of shareholders' equity) by the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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