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Debt Obligations (Details) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May. 15, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($)
Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage debt principal payment |  | $ 3,700,000 | $ 10,900,000
New Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt term | 4 years |  |
Maximum borrowing capacity | $ 600,000,000 |  |
Increase in limit | $ 400,000,000 |  |
Effective percentage rate, minimum | 0.00% |  |
Effective percentage rate, maximum | 0.55% |  |
Commitment fee percentage | 0.25% |  |
Minimum fixed charge coverage ratio | 1.5 |  |
Maximum leverage ratio | 0.60 |  |
Maximum unsecured indebtedness to unencumbered asset value ratio | 0.60 |  |
Maximum secured indebtedness to total asset value ratio | 0.40 |  |
Minimum unencumbered cash flow to interest expense on unsecured debt ratio | 1.75 |  |
Maximum percent of payments of dividends and distributions | 95.00% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.125% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Commitment fee percentage | 0.30% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.20% |  |
Basis spread on variable rate | 1.00% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.875% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.55% |  |
New Credit Facility [Member] | Revolving Credit Facility [Member] | Federal Funds Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 0.50% |  |
New Credit Facility [Member] | Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 65,000,000 |  |
New Credit Facility [Member] | Swing-Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 60,000,000 |  |
Tysons Corner [Member] | Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt outstanding |  | $ 88,000,000 | $ 88,000,000

X
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- Definition When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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