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Real Estate Investments - Discontinued Operations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |  |  |  |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2012 sqft | Dec. 31, 2011 sqft | Dec. 31, 2010 sqft | Dec. 31, 2009 | Dec. 31, 2012 Office property [Member] | Dec. 31, 2011 Office property [Member] | Dec. 31, 2012 Industrial Flex [Member] | Dec. 31, 2011 Industrial Flex [Member] | Aug. 31, 2012 Research Boulevard 1700 [Member] | Dec. 31, 2012 Research Boulevard 1700 [Member] sqft | Dec. 31, 2011 Research Boulevard 1700 [Member] | Dec. 31, 2010 Research Boulevard 1700 [Member] | Dec. 20, 2012 Plumtree Medical Center [Member] | Dec. 31, 2012 Plumtree Medical Center [Member] sqft | Dec. 31, 2011 Plumtree Medical Center [Member] | Dec. 31, 2010 Plumtree Medical Center [Member] | Dec. 31, 2012 Atrium Building [Member] sqft | Dec. 31, 2011 Atrium Building [Member] | Dec. 31, 2010 Atrium Building [Member] | Aug. 05, 2011 Industrial Portfolio [Member] | Dec. 31, 2012 Industrial Portfolio [Member] | Dec. 31, 2011 Industrial Portfolio [Member] sqft | Dec. 31, 2010 Industrial Portfolio [Member] | Sep. 02, 2011 Dulles Station, Phase I [Member] | Dec. 31, 2012 Dulles Station, Phase I [Member] | Dec. 31, 2011 Dulles Station, Phase I [Member] sqft | Dec. 31, 2010 Dulles Station, Phase I [Member] | Jun. 18, 2010 Parklawn Portfolio [Member] | Dec. 31, 2010 Parklawn Portfolio [Member] sqft | Dec. 21, 2010 The Ridges [Member] | Dec. 31, 2012 The Ridges [Member] | Dec. 31, 2011 The Ridges [Member] | Dec. 31, 2010 The Ridges [Member] sqft | Dec. 22, 2010 Ammendale I and II and Amvax [Member] | Dec. 31, 2010 Ammendale I and II and Amvax [Member] sqft | Dec. 31, 2012 Ammendale I and II [Member] | Dec. 31, 2011 Ammendale I and II [Member] | Dec. 31, 2010 Ammendale I and II [Member] | Dec. 31, 2012 Amvax [Member] | Dec. 31, 2011 Amvax [Member] | Dec. 31, 2010 Amvax [Member] | Dec. 31, 2012 Parklawn Plaza [Member] | Dec. 31, 2011 Parklawn Plaza [Member] | Dec. 31, 2010 Parklawn Plaza [Member] | Dec. 31, 2012 Lexington Building [Member] | Dec. 31, 2011 Lexington Building [Member] | Dec. 31, 2010 Lexington Building [Member] | Dec. 31, 2012 Saratoga Building [Member] | Dec. 31, 2011 Saratoga Building [Member] | Dec. 31, 2010 Saratoga Building [Member] | Dec. 31, 2012 Charleston Business Center [Member] | Dec. 31, 2011 Charleston Business Center [Member] | Dec. 31, 2010 Charleston Business Center [Member] | Dec. 31, 2012 Industrial Segment Member | Dec. 31, 2011 Industrial Segment Member | Dec. 31, 2010 Industrial Segment Member | Dec. 31, 2012 Discontinued Properties Member | Dec. 31, 2011 Discontinued Properties Member | Dec. 31, 2010 Discontinued Properties Member | Aug. 05, 2011 Office Building [Member] Industrial Portfolio [Member] properties | Aug. 05, 2011 Office Building [Member] Parklawn Portfolio [Member] properties | Aug. 05, 2011 Industrial Property [Member] Parklawn Portfolio [Member] properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Held-for-sale | $ 11,528 | $ 27,669 |  |  | $ 17,450 | $ 33,637 | $ 0 | $ 8,261 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Held-for-sale, Gross | 17,450 | 41,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less accumulated depreciation | (610,536) | (535,732) | (538,786) | (475,245) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,922) | (14,229) |  |  |  |
Rentable Square Feet | 213,000.0 | 3,272,000.0 | 638,000.0 |  |  |  |  |  |  |  | 101,000.0 | [1] |  |  |  | 33,000.0 |  |  | 79,000.0 |  |  |  |  |  | 3,092,000.0 | [2] |  |  |  | 180,000.0 |  |  | 229,000.0 | [1] |  |  |  | 104,000.0 |  | 305,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract Sales Price | 23,000 | 409,700 | 73,930 |  |  |  |  |  |  |  | 14,250 | [1] |  |  |  | 8,750 |  |  |  |  |  | 350,900 | [2] |  |  |  |  |  |  | 58,800 |  |  | 23,430 | [1] |  |  |  | 27,500 |  | 23,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties | 5,124 | 97,491 | 21,599 |  |  |  |  |  | 3,724 | [1] |  |  |  |  | 1,400 |  |  |  |  |  |  | 97,491 |  |  | 97,491 |  |  | 0 |  | 0 |  | 7,942 | 7,942 | [1] | 4,441 |  |  | 4,441 | 9,216 | 9,216 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 3 | 1
Real estate revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 23,045 | 32,191 | 4,155 | 31,525 | 53,009 |  |  |
Property expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,542) | (9,547) | (17,163) |  |  |
Real estate impairment | (2,097) | (14,526) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (599) | 0 |  |  |
Depreciation and amortization | (103,934) | (100,528) | (95,746) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (867) | (8,723) | (17,263) |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (261) | (733) | (2,014) |  |  |
Income from operations of properties sold or held for sale | 1,485 | 11,923 | 16,569 |  |  |  |  |  |  |  | 225 |  | 651 | 670 |  | 197 | 67 | 48 | 1,063 | 1,052 | 883 |  |  | 0 | 10,621 |  | 11,647 |  | 0 | (468) | 492 |  |  |  |  | 0 | 0 | 678 |  |  | 0 | 0 | 1,023 | 0 | 0 | 336 | 0 | 0 | 132 | 0 | 0 | 65 | 0 | 0 | 225 | 0 | 0 | 370 |  |  |  |  |  |  |  |  |
Segment |  |  |  |  |  |  |  |  |  |  | Office |  |  |  |  | Medical Office |  |  | Office |  |  |  |  | Industrial/Office |  |  |  |  | Office |  |  |  |  |  |  | Office |  |  |  |  | Industrial |  |  | Industrial |  |  | Office |  |  | Office |  |  | Office |  |  | Industrial |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,609 | $ 108,276 | $ 38,168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 16,484 | $ 22,857 |  |  |  |  |  |
Discontinued operations (in dollars per share) | $ 0.10 | $ 1.62 | $ 0.61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.23 | $ 0.36 |  |  |  |  |  |
Discontinued operations (in dollars per share) | $ 0.10 | $ 1.62 | $ 0.61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.23 | $ 0.36 |  |  |  |  |  |
[1] | The Industrial Portfolio consists of every property in our industrial segment and two office properties (the Crescent and Albemarle Point), and we closed on the sale on three separate dates. On September 2, 2011, we closed on the sale of the two office properties (the Crescent and Albemarle Point) and 8880 Gorman Road, Dulles South IV, Fullerton Business Center, Hampton Overlook, Alban Business Center, Pickett Industrial Park, Northern Virginia Industrial Park I, 270 Technology Park, Fullerton Industrial Center, Sully Square, 9950 Business Parkway, Hampton South and 8900 Telegraph Road. On October 3, 2011, we closed the sale of Northern Virginia Industrial Park II. On November 1, 2011, we closed on the sale of 6100 Columbia Park Road and Dulles Business Park I and II.
[2] | The Parklawn Portfolio consists of three office properties (Parklawn Plaza, Lexington Building and Saratoga Building) and one industrial property (Charleston Business Center).

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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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- Definition After tax income (loss) from operations of a business component (exclusive of any gain (loss) on disposal, or provision therefore) during the reporting period, until its disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -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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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1060-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6361211&loc=d3e7436-122677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-24 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1063-107759 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -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 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: 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. + Details
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- Definition The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8, 9, 10, 36, 37, 38 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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