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Subsequent Events (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2016 USD ($) property | Jul. 18, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of equity interest in joint ventures, maximum (in hundredths) |  |  | 50.00% |  |  | 50.00% |
Gain on disposition of property |  |  | $ 0 |  | $ 16,054 | $ 902 | $ 18,181
Pittsburgh PA Land Acquisition (7/2016) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of buildings | property | 1 |  |  |  |  |  |
Acquisition purchase price | $ 18,500 |  |  |  |  |  |
Acquisition-related costs | $ 500 |  |  |  |  |  |
4600 Madison Associates, LLC Joint Venture [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of equity interest in joint ventures, maximum (in hundredths) |  |  |  | 12.50% |  |  |
Proceeds received from disposition of property |  |  |  | $ 3,400 |  |  |
Gain on disposition of property |  |  |  | 1,000 |  |  |
Our share of gains on disposition of property |  |  |  | 100 |  |  |
Repayment of debt |  |  |  | $ 3,400 |  |  |
4600 Madison Associates, LLC Joint Venture [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of equity interest in joint ventures, maximum (in hundredths) |  | 12.50% |  |  |  |  |
Proceeds received from disposition of property |  | $ 32,700 |  |  |  |  |
Gain on disposition of property |  | 21,300 |  |  |  |  |
Our share of gains on disposition of property |  | 1,900 |  |  |  |  |
Repayment of debt |  | $ 6,300 |  |  |  |  |

X
- Definition Represents the entity's share of the gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations, as reported by an equity method investment of the entity. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount, reported by an equity method investment of the entity. + References No definition available. + Details
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- Definition Item represents the gain or loss arising from the sale of real estate of an equity method investee. + References No definition available. + Details
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- Definition The purchase price of real estate before or after closing credits to buyer for unfunded tenant improvements, building improvements or free rent, if any, of an equity method investee. + References No definition available. + Details
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- Definition The number of real estate office properties acquired. + References No definition available. + Details
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- Definition The maximum percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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