|
Properties, net (Details 3) (USD $)
|
3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2012
|
Jun. 30, 2012
|
Mar. 31, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
Greater Philadelphia
|
Sep. 30, 2012
Greater Philadelphia
|
Sep. 30, 2012
Colorado Springs
|
Sep. 30, 2012
Non-operating Properties
|
Sep. 30, 2012
400 Professional Drive
|
Jul. 02, 2012
Secured Debt [Member]
400 Professional Drive
|
Sep. 30, 2012
Operating properties
|
Jun. 30, 2012
Operating properties
|
Mar. 31, 2012
Operating properties
|
Sep. 30, 2012
Operating properties
sqft
buillding
|
Sep. 30, 2012
Operating properties
White Marsh Portfolio
sqft
buillding
|
Sep. 30, 2012
Operating properties
1101 Sentry Gateway
sqft
buillding
|
Sep. 30, 2012
Operating properties
222 and 224 Schilling Circle
sqft
buillding
|
Sep. 30, 2012
Operating properties
15 and 45 West Gude Drive
buillding
sqft
|
Sep. 30, 2012
Operating properties
11800 Tech Road
sqft
buillding
|
Sep. 30, 2012
Operating properties
400 Professional Drive
buillding
sqft
|
Sep. 30, 2012
Operating properties
July 2012 Portfolio Disposition
sqft
buillding
|
Sep. 30, 2012
Non-operating Properties
|
Jun. 30, 2012
Non-operating Properties
|
Mar. 31, 2012
Non-operating Properties
|
Sep. 30, 2012
Non-operating Properties
|
Sep. 30, 2012
Properties, net
Significant Unobservable Inputs (Level 3)
Fair value measurement on a nonrecurring basis
|
Sep. 30, 2012
Properties, net
Significant Unobservable Inputs (Level 3)
Fair value measurement on a nonrecurring basis
|
|
| Dispositions | |||||||||||||||||||||||||||||
| Asset Impairment Charges, Continuing and Noncontinuing Operations Including Exit Costs | $ 55,829,000 | $ 2,354,000 | $ 6,587,000 | $ 64,770,000 | $ 55,829,000 | $ 2,354,000 | $ 11,833,000 | $ 70,016,000 | $ 0 | $ 0 | $ (5,246,000) | $ (5,246,000) | |||||||||||||||||
| Debt setttled through the surrender of real estate assets | 15,000,000 | ||||||||||||||||||||||||||||
| Fair value of real estate disposed in settlement of debt | 11,000,000 | ||||||||||||||||||||||||||||
| Gain (loss) on early extinguishment of debt | (768,000) | (1,611,000) | (937,000) | (1,636,000) | 3,700,000 | ||||||||||||||||||||||||
| Impairment on Dispostion of Additional Property | 5,100,000 | ||||||||||||||||||||||||||||
| Expected future redevelopment expenditure | 25,000,000 | ||||||||||||||||||||||||||||
| Number of Buildings | 35 | 5 | 1 | 2 | 2 | 1 | 1 | 23 | |||||||||||||||||||||
| Total Rentable Square Feet | 2,302,000 | 163,000 | 95,000 | 56,000 | 231,000 | 240,000 | 130,000 | 1,387,000 | |||||||||||||||||||||
| Sale Price of Operating Properties | 285,506,000 | 19,100,000 | 13,500,000 | 4,400,000 | 49,107,000 | 21,300,000 | 16,198,000 | 161,901,000 | |||||||||||||||||||||
| Sale Price of Non-operating Properties | 28,100,000 | ||||||||||||||||||||||||||||
| Gain on Sale | 21,194,000 | 2,445,000 | 1,739,000 | 102,000 | 0 | 0 | 0 | 16,908,000 | |||||||||||||||||||||
| Disposals and Impairment Losses | |||||||||||||||||||||||||||||
| Aggregate net impairment losses recognized in connection with disposition plan | 18,700,000 | 46,100,000 | 6,900,000 | ||||||||||||||||||||||||||
| Aggregate net impairment losses recognized in discontinued operation in connection with disposition plan | 23,500,000 | ||||||||||||||||||||||||||||
| Exit Costs Included in Impairment Losses in Connection with Dispositions | $ (4,066,000) | $ 0 | $ 2,900,000 | $ 4,200,000 | |||||||||||||||||||||||||