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Subsequent Events (Details) - USD ($) | Oct. 09, 2015 | Oct. 08, 2015 | Oct. 07, 2015 | Sep. 30, 2015 | Dec. 31, 2014
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Subsequent Event [Line Items] |  |  |  |  |
Unsecured term loans |  |  |  | $ 200,000,000 | $ 200,000,000
Mortgages [Member] | Tysons Corner [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Repayments of debt | $ 88,400,000 |  |  |  |
Accrued interest | $ 400,000 |  |  |  |
Unsecured Debt [Member] | Seven Year Term Loan [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Debt term | 7 years |  |  |  |
Unsecured term loans |  | $ 250,000,000 | $ 200,000,000 |  |
Increase in debt |  | 50,000,000 |  |  |
Increase in limit |  | $ 150,000,000 |  |  |
Effective interest rate |  | 3.72% |  |  |
LIBOR [Member] | Unsecured Debt [Member] | Seven Year Term Loan [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.80% |  |  |

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- Definition Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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