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Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 01, 2015 | Mar. 03, 2015 | Apr. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Outstanding debt |  |  |  | $ 869,403,000 |
Debt outstanding with fixed-rate |  |  |  | 824,500,000 | $ 784,800,000
Debt outstanding with variable-rate |  |  |  | 44,900,000 | 72,600,000
Revolving credit facility payable |  |  |  | 30,000,000 | 43,000,000
Carrying value of properties collateralizing mortgage notes |  |  |  | 860,500,000 | 895,500,000
Construction loan |  |  |  | 31,413,000 | 5,391,000
Total outstanding debt |  |  |  |  | 857,400,000
Olney Center |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from sale of real estate |  |  | $ 11,000,000 | 11,000,000 |
Sale-leaseback, monthly lease payments |  |  |  | $ 60,400 |
Annual increase in rental payments, percentage |  |  |  | 1.50% |
Sale-leaseback, fixed interest rate |  |  |  | 8.00% |
Sales price of property |  |  |  | $ 11,000,000 |
Sale leaseback, option to purchase the property |  |  | $ 14,600,000 | 14,600,000 |
Metro Pike Center Bank Loan | Fixed Rate Mortgage Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  | 7,800,000 |
Metro Pike Center Bank Loan | Variable Rate Loans Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount outstanding |  |  |  | 14,900,000 |
Shops at Fairfax and Boulevard |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Construction-to-permanent loan |  | $ 30,000,000 |  |  |
Debt term |  | 15 years |  |  |
Debt maturity year |  | 2030 |  |  |
Fixed interest rate |  | 3.69% |  |  |
Shops at Fairfax and Boulevard | Fixed Rate Mortgage Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Monthly principal and interest payments |  | $ 153,300 |  |  |
Debt amortization period |  | 25 years |  |  |
Final payment amount |  | $ 15,500,000 |  |  |
Northrock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Construction-to-permanent loan | $ 16,000,000 |  |  |  |
Debt term | 15 years |  |  |  |
Debt maturity year | 2030 |  |  |  |
Fixed interest rate | 3.99% |  |  |  |
Northrock | Fixed Rate Mortgage Notes Payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Monthly principal and interest payments | $ 84,400 |  |  |  |
Debt amortization period | 25 years |  |  |  |
Final payment amount | $ 8,400,000 |  |  |  |
Van Ness Square |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Construction-to-permanent loan |  |  |  | 71,600,000 |
Construction loan |  |  |  | 31,400,000 |
Unsecured Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility payable |  |  |  | 30,000,000 | $ 43,000,000
Line of credit facility, maximum borrowing capacity |  |  |  | $ 275,000,000 |
Line of credit facility maturity date |  |  |  | Jun. 23, 2018 |
Extension in line of credit facility period |  |  |  | 1 year |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 244,600,000 |
Description of variable rate basis |  |  |  | one-month LIBOR |
Unsecured Revolving Credit Facility | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spread on LIBOR |  |  |  | 1.45% |
Unsecured Revolving Credit Facility | LIBOR | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spread on LIBOR |  |  |  | 1.45% |
Unsecured Revolving Credit Facility | LIBOR | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spread on LIBOR |  |  |  | 2.00% |
Letter of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 448,000 |

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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + 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 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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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- 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 Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (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(a)(2)) -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 -Paragraph 19, 20, 22 -Article 5 + Details
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