Annual report pursuant to Section 13 and 15(d)

Nature Of Business Schedule of Dispositions (Details)

Nature Of Business Schedule of Dispositions (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 22, 2013
Medical Office And Office Building [Member]
Medical Office Porfolio [Member]
schedule of dispositions [Line Items]        
Gain (Loss) on Sale of Properties $ 22,144 $ 5,124 $ 97,491 $ 18,949 [1]
[1] 2440 M Street, 15001 Shady Grove Road, 15505 Shady Grove Road, 19500 at Riverside Park (formerly Lansdowne Medical Office Building), 9707 Medical Center Drive, CentreMed I and II, 8301 Arlington Boulevard, Sterling Medical Office Building, Shady Grove Medical Village II, Alexandria Professional Center, Ashburn Farm Office Park I, Ashburn Farm Office Park II, Ashburn Farm Office Park III, Woodholme Medical Office Building, two office properties (6565 Arlington Boulevard and Woodholme Center) and undeveloped land at 4661 Kenmore Avenue. Subsequent to the end of 2013, we closed on Transaction III, consisting of Woodburn Medical Park I and II, and Transaction IV, consisting of Prosperity Medical Center I, II and III (see note 17).