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Mortgage Notes Payable (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |  |
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Dec. 31, 2012 buildings | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 John Marshall II Member | Dec. 31, 2011 John Marshall II Member | Dec. 31, 2012 Olney Village Center Member | Dec. 31, 2011 Olney Village Center Member | Dec. 31, 2012 Kenmore Apartments [Member] | Dec. 31, 2011 Kenmore Apartments [Member] | Dec. 31, 2012 2445 M Street [Member] | Dec. 31, 2011 2445 M Street [Member] | Dec. 31, 2012 3801 Connecticut, Walker House, Bethesda Hill [Member] | Dec. 31, 2011 3801 Connecticut, Walker House, Bethesda Hill [Member] | Dec. 31, 2012 Ashburn Farm Office 5.56% [Member] | Dec. 31, 2011 Ashburn Farm Office 5.56% [Member] | Dec. 31, 2012 Ashburn Farm Office 5.69% [Member] | Dec. 31, 2011 Ashburn Farm Office 5.69% [Member] | Dec. 31, 2012 Woodholme Medical Center [Member] | Dec. 31, 2011 Woodholme Medical Center [Member] | Dec. 31, 2012 West Gude [Member] | Dec. 31, 2011 West Gude [Member] | Jan. 02, 2013 West Gude [Member] Subsequent Event [Member] | Oct. 11, 2012 15005 Shady Grove [Member] | Dec. 31, 2012 15005 Shady Grove [Member] | Dec. 31, 2011 15005 Shady Grove [Member] | Dec. 11, 2012 Plumtree Medical Center [Member] | Dec. 31, 2012 Plumtree Medical Center [Member] | Dec. 31, 2011 Plumtree Medical Center [Member] | Nov. 02, 2012 Medical Center Drive 9707 [Member] | Dec. 31, 2012 Medical Center Drive 9707 [Member] | Dec. 31, 2011 Medical Center Drive 9707 [Member] | Aug. 02, 2012 Frederick Crossing [Member] | Dec. 31, 2012 Frederick Crossing [Member] | Dec. 31, 2011 Frederick Crossing [Member] | Nov. 30, 2012 Prosperity Medical Center [Member] | Dec. 31, 2012 Prosperity Medical Center 5.36% [Member] | Dec. 31, 2011 Prosperity Medical Center 5.36% [Member] | Dec. 31, 2012 Prosperity Medical Center 5.34% [Member] | Dec. 31, 2011 Prosperity Medical Center 5.34% [Member]
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral for mortgage notes payable | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note, fair value interest rate |  |  |  | 5.79% | [1] |  | 4.94% | [1] |  | 5.37% | [1] |  | 7.25% | [1],[2] |  |  | 5.71% | [1],[3] |  |  | 5.56% | [1] |  | 5.69% | [1] |  | 5.29% | [1] |  | 5.86% | [1] |  |  |  | 5.73% | [1],[4] |  |  |  | 5.68% | [1],[5] |  |  |  | 5.32% | [1],[6] |  |  |  | 5.95% | [1],[7] |  |  |  | 5.36% | [1],[8] |  |  | 5.34% | [1],[8] |  |
Mortgage notes payable | $ 342,970,000 | $ 427,710,000 |  | $ 53,274,000 |  | $ 53,936,000 | $ 22,343,000 |  | $ 23,873,000 | $ 35,535,000 |  | $ 36,097,000 | $ 96,848,000 | [2] | $ 95,593,000 | [2] | $ 81,029,000 | [3] | $ 81,029,000 | [3] | $ 2,313,000 |  | $ 2,438,000 | $ 2,024,000 |  | $ 2,159,000 | $ 19,608,000 |  | $ 19,954,000 | $ 29,996,000 |  | $ 30,761,000 |  |  | $ 0 | [4] | $ 7,974,000 | [4] |  | $ 0 | [5] | $ 4,419,000 | [5] |  | $ 0 | [6] | $ 4,780,000 | [6] |  | $ 0 | [7] | $ 21,700,000 | [7] |  | $ 0 | [8] | $ 31,169,000 | [8] | $ 0 | [8] | $ 11,828,000 | [8]
Extension term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount, Mortgaged Properties | 510,000,000 | 670,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments – mortgage notes payable | $ 85,667,000 | $ 32,331,000 | $ 25,985,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 | $ 7,800,000 |  |  |  |  | $ 4,300,000 |  |  |  |  | $ 4,600,000 |  |  |  |  | $ 21,300,000 |  |  |  |  | $ 42,100,000 |  |  |  |  |  |  |  |
[1] | Yield on the assumption/issuance date, including the effects of any premiums, discounts or fair value adjustments on the notes.
[2] | Interest only is payable monthly until the maturity date upon which all unpaid principal and interest are payable in full.
[3] | Interest only is payable monthly until the maturity date, which can be extended for one year upon which the interest rate is reset on June 1, 2016. At maturity on June 1, 2017, all unpaid principal and interest are payable in full.
[4] | On October 11, 2012, we repaid without penalty the remaining $7.8 million of principal on the mortgage note secured by 15005 Shady Grove Road.
[5] | On December 11, 2012, we repaid without penalty the remaining $4.3 million of principal on the mortgage note secured by Plumtree Medical Center. Because Plumtree Medical Center was sold during 2012 (see Note 3 to the consolidated financial statements), the mortgage note is included in "Other liabilities related to properties sold or held for sale" on our consolidated balance sheets as of December 31, 2011.
[6] | On November 1, 2012, we repaid without penalty the remaining $4.6 million of principal on the mortgage note secured by 9707 Medical Center Drive.
[7] | On August 1, 2012, we repaid without penalty the remaining $21.3 million of principal on the mortgage note secured by Frederick Crossing.
[8] | On November 30, 2012, we repaid without penalty the remaining $42.1 million of principal on the mortgage notes secured by Prosperity Medical Centers.

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