Annual report pursuant to Section 13 and 15(d)

Properties, net (Details 3)

v2.4.0.8
Properties, net (Details 3) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Non-operating Properties
Dec. 31, 2012
Non-operating Properties
Dec. 23, 2013
Secured Debt
December 2013 Portfolio Conveyance
Jul. 02, 2012
Secured Debt
400 Professional Drive
Dec. 23, 2013
Secured Debt
Fair value measurement on a nonrecurring basis
December 2013 Portfolio Conveyance
Jul. 02, 2012
Secured Debt
Fair value measurement on a nonrecurring basis
400 Professional Drive
Dec. 31, 2013
Operating properties
buillding
sqft
Dec. 31, 2012
Operating properties
buillding
sqft
Dec. 31, 2013
Operating properties
920 Elkridge Landing Road
buillding
sqft
Dec. 31, 2013
Operating properties
4230 Forbes Boulevard
buillding
sqft
Dec. 31, 2013
Operating properties
December 2013 Colorado Springs Portfolio Disposition
buillding
sqft
Dec. 31, 2013
Operating properties
December 2013 Portfolio Conveyance
buillding
sqft
Dec. 31, 2012
Operating properties
White Marsh Portfolio
buillding
sqft
Dec. 31, 2012
Operating properties
1101 Sentry Gateway
buillding
sqft
Dec. 31, 2012
Operating properties
222 and 224 Schilling Circle
buillding
sqft
Dec. 31, 2012
Operating properties
15 and 45 West Gude Drive
buillding
sqft
Dec. 31, 2012
Operating properties
11800 Tech Road
buillding
sqft
Dec. 31, 2012
Operating properties
400 Professional Drive
buillding
sqft
Dec. 31, 2012
Operating properties
July 2012 Portfolio Disposition
buillding
sqft
Dispositions                                            
Number of Buildings Disposed                   31 35 1 1 15 14 5 1 2 2 1 1 23
Total Rentable Square Feet                   2,345,000 2,302,000 103,000 56,000 1,165,000 1,021,000 163,000 95,000 56,000 231,000 240,000 130,000 1,387,000
Transaction Value of Operating Property Dispositions                   $ 293,301,000 $ 285,506,000 $ 6,900,000 $ 5,600,000 $ 133,925,000 $ 146,876,000 $ 19,100,000 $ 13,500,000 $ 4,400,000 $ 49,107,000 $ 21,300,000 $ 16,198,000 $ 161,901,000
Gain on Sale                   2,671,000 21,186,000 0 1,507,000 1,164,000 0 2,445,000 1,739,000 102,000 0 0 0 16,900,000
Sale Price of Non-operating Properties       3,500,000 28,100,000                                  
Debt settled through the surrender of real estate assets           146,500,000 15,000,000                              
Fair value of real estate disposed in settlement of debt               74,000,000 11,000,000                          
Gain on early extinguishment of debt $ (27,030,000) $ (943,000) $ (1,639,000)     $ 67,800,000 $ 3,700,000