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v3.3.1.900

Properties, net (Details 5) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 28, 2015 USD ($) | Dec. 23, 2013 USD ($) | Dec. 31, 2015 USD ($) ft² Property buillding | Dec. 31, 2014 USD ($) ft² Property buillding | Dec. 31, 2013 USD ($) ft² Property buillding
Dispositions |  |  |  |  |
Gain (loss) on early extinguishment of debt |  |  | $ 85,275 | $ (9,552) | $ (27,030)
Non-operating Properties [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Gain on Disposition |  |  | 4,000 | 5,600 |
Sale price of non-operating properties |  |  | $ 18,100 | $ 28,300 | $ 3,500
Operating properties, net [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 9 | 8 | 31
Total Rentable Square Feet | ft² |  |  | 1,597,000 | 302,958 | 2,345,000
Transaction value of operating property dispositions |  |  | $ 347,785 | $ 28,835 | $ 293,301
Gain on Disposition |  |  | $ 64,033 | $ 5,093 | $ 2,671
Operating properties, net [Member] | 1550 Westbranch Drive [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 1 |  |
Total Rentable Square Feet | ft² |  |  | 160,000 |  |
Transaction value of operating property dispositions |  |  | $ 27,800 |  |
Gain on Disposition |  |  | $ 0 |  |
Operating properties, net [Member] | 15000 and 15010 Conference Center Drive [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 2 |  |
Total Rentable Square Feet | ft² |  |  | 665,000 |  |
Transaction value of operating property dispositions |  |  | $ 167,335 |  |
Gain on Disposition |  |  | $ 0 |  |
Operating properties, net [Member] | 13200 Woodland Park Road [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 1 |  |
Total Rentable Square Feet | ft² |  |  | 397,000 |  |
Transaction value of operating property dispositions |  |  | $ 84,000 |  |
Gain on Disposition |  |  | $ 42,515 |  |
Operating properties, net [Member] | 9900, 9910, 9920 Franklin Square Drive [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 3 |  |
Total Rentable Square Feet | ft² |  |  | 135,000 |  |
Transaction value of operating property dispositions |  |  | $ 24,150 |  |
Gain on Disposition |  |  | $ 6,468 |  |
Operating properties, net [Member] | 9690 Deereco Road and 375 W Padonia Road [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  | 2 |  |
Total Rentable Square Feet | ft² |  |  | 240,000 |  |
Transaction value of operating property dispositions |  |  | $ 44,500 |  |
Gain on Disposition |  |  | $ 15,050 |  |
Operating properties, net [Member] | 4969 and 4979 Mercantile Rd [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  | 2 |
Total Rentable Square Feet | ft² |  |  |  | 96,721 |
Transaction value of operating property dispositions |  |  |  | $ 5,960 |
Gain on Disposition |  |  |  | $ 2,124 |
Operating properties, net [Member] | 9930 and 9940 Franklin Square [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  | 2 |
Total Rentable Square Feet | ft² |  |  |  | 71,992 |
Transaction value of operating property dispositions |  |  |  | $ 10,475 |
Gain on Disposition |  |  |  | $ 2,303 |
Operating properties, net [Member] | 5020, 5022, 5024 and 5026 Campbell Boulevard [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  | 4 |
Total Rentable Square Feet | ft² |  |  |  | 134,245 |
Transaction value of operating property dispositions |  |  |  | $ 12,400 |
Gain on Disposition |  |  |  | 666 |
Operating properties, net [Member] | 920 Elkridge Landing Road [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  |  | 1
Total Rentable Square Feet | ft² |  |  |  |  | 103,000
Transaction value of operating property dispositions |  |  |  |  | $ 6,900
Gain on Disposition |  |  |  |  | $ 0
Operating properties, net [Member] | 4230 Forbes Boulevard [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  |  | 1
Total Rentable Square Feet | ft² |  |  |  |  | 56,000
Transaction value of operating property dispositions |  |  |  |  | $ 5,600
Gain on Disposition |  |  |  |  | $ 1,507
Operating properties, net [Member] | December 2013 Colorado Springs Portfolio Disposition [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  |  | 15
Total Rentable Square Feet | ft² |  |  |  |  | 1,165,000
Transaction value of operating property dispositions |  |  |  |  | $ 133,925
Gain on Disposition |  |  |  |  | $ 1,164
Operating properties, net [Member] | December 2013 Portfolio Conveyance [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Number of Buildings Disposed | buillding |  |  |  |  | 14
Total Rentable Square Feet | ft² |  |  |  |  | 1,021,000
Transaction value of operating property dispositions |  |  |  |  | $ 146,876
Gain on Disposition |  |  |  |  | $ 0
Greater Philadelphia [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Depreciation Expense Resulting From Useful Life Change |  |  |  | $ 12,900 |
15000 and 15010 Conference Center Drive [Member] | Northern Virginia [Member] | Operating properties, net [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Debt settled through the surrender of real estate assets | $ 150,000 |  |  |  |
Gain (loss) on early extinguishment of debt | $ 84,800 |  |  |  |
December 2013 Portfolio Conveyance [Member] | Operating properties, net [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Debt settled through the surrender of real estate assets |  | $ 146,500 |  |  |
Gain (loss) on early extinguishment of debt |  | $ 67,800 |  |  |
Newly-constructed properties placed in service [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Square Feet of Properties Placed in Service | ft² |  |  | 897,000 | 692,000 | 812,000
Number of real estate properties | Property |  |  | 7 | 5 | 8
Newly Redeveloped Properties Placed In Service [Member] | Greater Philadelphia and St. Mary's County, Maryland [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Square Feet of Properties Placed in Service | ft² |  |  | 170,000 |  |
Number of real estate properties | Property |  |  | 2 |  |
Properties under Construction or Contractually Commited for Construction [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Total Rentable Square Feet | ft² |  |  | 1,300,000 |  |
Number of real estate properties | Property |  |  | 9 |  |
Properties under redevelopment [Member] |  |  |  |  |
Dispositions |  |  |  |  |
Total Rentable Square Feet | ft² |  |  | 156,000 |  |
Number of real estate properties | Property |  |  | 4 |  |

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