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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  |  | $ 1,238 | $ 1,302 | $ 1,238 | $ 1,302
Redeemable Non-Controlling Interest | Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Fair value inputs, discount rate |  |  |  |  | 15.50% |
Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  |  | $ 1,238 | $ 1,302 | $ 1,238 | $ 1,302
Northern Virginia | Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses | $ 1,200 |  |  |  |  |
Greater Baltimore | Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  | $ 1,300 |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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