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Real Estate Investments Acquisitions (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2015 USD ($) a ft² | May. 12, 2015 USD ($) ft² | Apr. 09, 2015 USD ($) a | Apr. 06, 2015 USD ($) a | Apr. 02, 2015 USD ($) ft² parking_space | Jun. 30, 2015 USD ($) ft² Properties | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) ft² Properties | Jun. 30, 2014 USD ($)
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  |  | 985,914 |  | 985,914 |
Net gain from remeasurement of investments in real estate ventures |  |  |  |  |  | $ 758 | $ 458 | $ 758 | $ 458
Net Rentable Space | parking_space |  |  |  |  | 330 |  |  |  |
Broadmoor Austin Associates [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a | 66.0 |  |  |  |  |  |  |  |
Purchase Price of Assets | $ 211,400 |  |  |  |  |  |  |  |
Rentable Square Feet | ft² | 1,112,236 |  |  |  |  |  |  |  |
Lease Percentage of Acquired Property |  |  |  |  |  | 100.00% |  | 100.00% |
Payments to Acquire Land | $ 143,800 |  |  |  |  |  |  |  |
Amount funded by corporate funds | 81,000 |  |  |  |  |  |  |  |
Funds Held in Escrow | 62,800 |  |  |  |  |  |  |  |
Mortgage Debt Paid at Closing | $ 51,200 |  |  |  |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |  |  |  |  |
Percentage of ownership interests | 50.00% |  |  |  |  |  |  |  |
Net gain from remeasurement of investments in real estate ventures | $ 800 |  |  |  |  |  |  |  |
Building, land and improvements | 161,252 |  |  |  |  |  |  |  |
Broadmoor Austin Associates [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Acquisition Costs | $ 200 |  |  |  |  |  |  |  |
405 Colorado Drive [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  | 0.4 |  |  |  |  |  |
Payments to Acquire Land |  |  | $ 2,600 |  |  |  |  |  |
Land - 25 M Street [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Area Owned by Company of Undeveloped Parcels Of Land | a |  |  |  | 0.8 |  |  |  |  |
Total Potential Development Capacity | ft² |  | 271,000 |  |  |  |  |  |  |
Payments to Acquire Land |  |  |  | $ 20,300 |  |  |  |  |
Acquisition Costs |  |  |  | $ 300 |  |  |  |  |
Percent of Acquired Entity |  | 95.00% |  |  |  |  |  |  |
Land - 25 M Street [Member] | Akridge [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Land |  | $ 1,000 |  |  |  |  |  |  |
Asset Acquisition Ownership Percent |  | 5.00% |  |  |  |  |  |  |
618 Market Street [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Total Potential Development Capacity | ft² |  |  |  |  | 14,404 |  |  |  |
Payments to Acquire Land |  |  |  |  | $ 19,400 |  |  |  |
Fair Value of Contingent Consideration |  |  |  |  | 1,600 |  |  |  |
Consideration, Cash |  |  |  |  | 17,800 |  |  |  |
Building, land and improvements |  |  |  |  | 19,200 |  |  |  |
Intangible Assets |  |  |  |  | $ 200 |  |  |  |
Office Building [Member] | Broadmoor Austin Associates [Member] |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |  |  |  |  |
Number of Units in Real Estate Property | Properties |  |  |  |  |  | 7 |  | 7 |

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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