Annual report pursuant to Section 13 and 15(d)

Real Estate Investments - Continuing Operations (Details)

v2.4.0.6
Real Estate Investments - Continuing Operations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Office [Member]
Dec. 31, 2011
Office [Member]
Dec. 31, 2012
Medical Office [Member]
Dec. 31, 2011
Medical Office [Member]
Dec. 31, 2012
Retail [Member]
Dec. 31, 2011
Retail [Member]
Dec. 31, 2012
Multifamily [Member]
Dec. 31, 2011
Multifamily [Member]
Dec. 31, 2012
Office [Member]
Dec. 31, 2011
Office [Member]
Dec. 31, 2012
Medical Office [Member]
Dec. 31, 2011
Medical Office [Member]
Dec. 31, 2012
Retail [Member]
Dec. 31, 2011
Retail [Member]
Dec. 31, 2012
Multifamily [Member]
Dec. 31, 2011
Multifamily [Member]
Dec. 31, 2012
4661 Kenmore Avenue [Member]
Dec. 31, 2011
Dulles Station II [Member]
Dec. 31, 2012
Dulles Station II [Member]
Real Estate Properties [Line Items]                                            
Real estate, adjusted $ 2,529,131 [1]                                     $ 3,810 [1],[2]   $ 12,070 [1],[2]
Real estate investment property, at cost 2,462,546 2,364,885                   1,315,633 1,234,499 403,064 396,532 411,948 408,897 331,901 324,957      
Properties under development or held for future development 49,135 43,089   8,977 8,953 3,810 5,758 587 576 35,761 27,802                      
Real estate impairment $ 2,097 $ 14,526 $ 0                                 $ 2,100 $ 14,500  
[1] At December 31, 2012, total land, buildings and improvements are carried at $2,148,544,000 for federal income tax purposes.
[2] As of December 31, 2012, WRIT had land held for development in Herndon, VA (Dulles Station, Phase II). WRIT also held a 0.8 acre parcel of land at 4661 Kenmore for future development. Additionally, WRIT had investments in various smaller development or redevelopment projects. The total land value not yet placed in service of these development projects at December 31, 2012 was $7.5 million. $0.5 million of Dulles Station, Phase II land was placed into service upon the completion of a portion of the parking garage structure.