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Properties, net (Details 6) ft² in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 28, 2015 USD ($) | Dec. 31, 2016 USD ($) ft² buillding Property | Dec. 31, 2015 USD ($) ft² buillding Property | Dec. 31, 2014 USD ($) ft² buillding Property
Dispositions |  |  |  |
(Loss) gain on early extinguishment of debt |  | $ (1,110) | $ 85,275 | $ (9,552)
Non-operating Properties [Member] |  |  |  |
Dispositions |  |  |  |
Gain on disposition |  |  | 4,000 | 5,600
Sale price of non-operating properties |  |  | $ 18,100 | $ 28,300
Operating properties, net [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  | 21 | 9 | 8
Total Rentable Square Feet | ft² |  | 1,577 | 1,597 | 303
Transaction Value |  | $ 248,738 | $ 347,785 | $ 28,835
Gain on disposition |  | $ 15,871 | $ 64,033 | $ 5,093
15000 and 15010 Conference Center Drive [Member] | Operating properties, net [Member] |  |  |  |
Dispositions |  |  |  |
Debt settled through the surrender of real estate assets | $ 150,000 |  |  |
(Loss) gain on early extinguishment of debt | $ 84,800 |  |  |
Regional Office [Member] | Operating properties, net [Member] | 1550 Westbranch Drive [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  | 1 |
Total Rentable Square Feet | ft² |  |  | 160 |
Transaction Value |  |  | $ 27,800 |
Gain on disposition |  |  | $ 0 |
Regional Office [Member] | Operating properties, net [Member] | 13200 Woodland Park Road [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  | 1 |
Total Rentable Square Feet | ft² |  |  | 397 |
Transaction Value |  |  | $ 84,000 |
Gain on disposition |  |  | $ 42,515 |
Regional Office [Member] | Operating properties, net [Member] | 9900, 9910, 9920 Franklin Square Drive [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  | 3 |
Total Rentable Square Feet | ft² |  |  | 135 |
Transaction Value |  |  | $ 24,150 |
Gain on disposition |  |  | $ 6,468 |
Regional Office [Member] | Operating properties, net [Member] | 9690 Deereco Road and 375 W Padonia Road [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  | 2 |
Total Rentable Square Feet | ft² |  |  | 240 |
Transaction Value |  |  | $ 44,500 |
Gain on disposition |  |  | $ 15,050 |
Regional Office [Member] | Operating properties, net [Member] | 4969 and 4979 Mercantile Rd [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  |  | 2
Total Rentable Square Feet | ft² |  |  |  | 97
Transaction Value |  |  |  | $ 5,960
Gain on disposition |  |  |  | $ 2,124
Regional Office [Member] | Operating properties, net [Member] | 9930 and 9940 Franklin Square [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  |  | 2
Total Rentable Square Feet | ft² |  |  |  | 72
Transaction Value |  |  |  | $ 10,475
Gain on disposition |  |  |  | $ 2,303
Regional Office [Member] | Operating properties, net [Member] | 5020, 5022, 5024 and 5026 Campbell Boulevard [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  |  | 4
Total Rentable Square Feet | ft² |  |  |  | 134
Transaction Value |  |  |  | $ 12,400
Gain on disposition |  |  |  | $ 666
Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member] | Operating properties, net [Member] | 15000 and 15010 Conference Center Drive [Member] |  |  |  |
Dispositions |  |  |  |
Number of Buildings | buillding |  |  | 2 |
Total Rentable Square Feet | ft² |  |  | 665 |
Transaction Value |  |  | $ 167,335 |
Gain on disposition |  |  | $ 0 |
Newly-constructed properties placed in service [Member] |  |  |  |
Dispositions |  |  |  |
Square Feet of Properties Placed in Service | ft² |  | 639 | 897 | 692
Number of real estate properties | Property |  | 6 | 7 | 5
Newly Redeveloped Properties Placed In Service [Member] |  |  |  |
Dispositions |  |  |  |
Square Feet of Properties Placed in Service | ft² |  | 61 |  |
Number of real estate properties | Property |  | 3 |  |
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 |
Number of real estate properties | Property |  |  | 2 |
Properties under Construction or Contractually Commited for Construction [Member] |  |  |  |
Dispositions |  |  |  |
Total Rentable Square Feet | ft² |  | 1,300 |  |
Number of real estate properties | Property |  | 8 |  |
Properties under redevelopment [Member] |  |  |  |
Dispositions |  |  |  |
Total Rentable Square Feet | ft² |  | 104 |  |
Number of real estate properties | Property |  | 3 |  |
Office properties under, or contractually committed for, construction or approved for redevelopment [Member] |  |  |  |
Dispositions |  |  |  |
Total Rentable Square Feet | ft² |  | 1,400 |  |
Number of real estate properties | Property |  | 11 |  |
Office properties under, or contractually committed for, construction or approved for redevelopment [Member] | Properties completed Held-for-future lease [Member] |  |  |  |
Dispositions |  |  |  |
Number of real estate properties | Property |  | 2 |  |
Office properties under, or contractually committed for, construction or approved for redevelopment [Member] | Partially operational properties [Member] |  |  |  |
Dispositions |  |  |  |
Number of real estate properties | Property |  | 2 |  |

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