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Real Estate Investments Acquisitions (Details) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2015 USD ($) a | Jul. 07, 2015 USD ($) a | Jun. 22, 2015 USD ($) a ft² property | May. 12, 2015 USD ($) ft² | Apr. 09, 2015 USD ($) a | Apr. 06, 2015 USD ($) a | Apr. 02, 2015 USD ($) ft² parking_space | Sep. 30, 2015 USD ($) ft² | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) ft² | Sep. 30, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain from remeasurement of investment in real estate ventures |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 758 | $ 458
Net Rentable Space | parking_space |  |  |  |  |  |  |  | 330 |  |  |  |
Broadmoor Austin Associates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  |  | 66.0 |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  | $ 143,800 |  |  |  |  |  |  |  |
Amount funded by corporate funds |  |  |  | $ 81,000 |  |  |  |  |  |  |  |
Percentage of ownership interests |  |  |  | 50.00% |  |  |  |  |  |  |  |
Purchase Price of Assets |  |  |  | $ 211,400 |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  | 1,112,236 |  |  |  |  |  |  |  |
Lease Percentage of Acquired Property |  |  |  |  |  |  |  |  | 100.00% |  | 100.00% |
Funds Held in Escrow |  |  |  | $ 62,800 |  |  |  |  |  |  |  |
Mortgage Debt Paid at Closing |  |  |  | $ 51,200 |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |
Net gain from remeasurement of investment in real estate ventures |  |  |  | $ 800 |  |  |  |  |  |  |  |
Building, land and improvements |  |  |  | 163,271 |  |  |  |  |  |  |  |
Broadmoor Austin Associates [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Costs |  |  |  | $ 200 |  |  |  |  |  |  |  |
618 Market Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  |  | $ 19,400 |  |  |  |
Total Potential Development Capacity | ft² |  |  |  |  |  |  |  | 14,404 |  |  |  |
Fair Value of Contingent Consideration |  |  |  |  |  |  |  | $ 1,600 |  |  |  |
Consideration, Cash |  |  |  |  |  |  |  | 17,800 |  |  |  |
Building, land and improvements |  |  |  |  |  |  |  | 19,200 |  |  |  |
Intangible Assets |  |  |  |  |  |  |  | $ 200 |  |  |  |
Office Building [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² | [1] |  |  |  |  |  |  |  | 1,415,704 |  | 1,415,704 |
Office Building [Member] | Broadmoor Austin Associates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | property |  |  |  | 7 |  |  |  |  |  |  |  |
9 Presidential Boulevard [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  | 2.7 |  |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  | $ 4,100 |  |  |  |  |  |  |  |  |  |
2100 Market Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  | 0.8 |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  | $ 18,800 |  |  |  |  |  |  |  |  |
Amount funded by corporate funds |  |  | 16,800 |  |  |  |  |  |  |  |  |
Amount Deferred |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Settlement Period |  |  | 24 months |  |  |  |  |  |  |  |  |
405 Colorado Drive [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  |  |  |  | 0.4 |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  | $ 2,600 |  |  |  |  |  |
25 M Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  |  |  |  |  | 0.8 |  |  |  |  |
Payments to Acquire Land |  |  |  |  |  |  | $ 20,300 |  |  |  |  |
Acquisition Costs |  |  |  |  |  |  | $ 300 |  |  |  |  |
Total Potential Development Capacity | ft² |  |  |  |  | 271,000 |  |  |  |  |  |  |
25 M Street [Member] | Brandywine 25 M Street [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of Acquired Entity |  |  |  |  | 95.00% |  |  |  |  |  |  |
25 M Street [Member] | Akridge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Asset Acquisition Ownership Percent |  |  |  |  | 5.00% |  |  |  |  |  |  |
[1] | Total gain/(loss) on sale does not include a deferred gain of $0.5 million related to a prior sale and $0.1 million in losses associated with prior sales.

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