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Summary of Significant Accounting Policies - Real Estate and Depreciation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] Building [Member] | Dec. 31, 2012 Minimum [Member] Building and Building Improvements [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Building [Member] | Dec. 31, 2012 Maximum [Member] Building and Building Improvements [Member] | Dec. 31, 2012 4661 Kenmore Avenue [Member] | Dec. 31, 2011 Dulles Station, Phase I [Member] | Dec. 31, 2011 Dulles Station II [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful Life |  |  |  | 3 years | 28 years | 3 years | 50 years | 50 years | 30 years |  |  |
Real estate depreciation | $ 76,824 | $ 69,753 | $ 63,372 |  |  |  |  |  |  |  |  |
Total interest expense from continuing operations | 66,385 | 66,952 | 67,823 |  |  |  |  |  |  |  |  |
Capitalized interest | 1,688 | 738 | 858 |  |  |  |  |  |  |  |  |
Interest expense, net of capitalized interest | 64,697 | 66,214 | 66,965 |  |  |  |  |  |  |  |  |
Impairment of real estate | $ 2,097 | $ 14,526 | $ 0 |  |  |  |  |  |  | $ 2,100 | $ 600 | $ 14,500

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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