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Real Estate (Narrative) (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 0 Months Ended
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Quartermaster Plaza [Member] | Mar. 21, 2014 Quartermaster Plaza [Member] | Jun. 30, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2015 [Member] | Mar. 21, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2015 [Member] | Jun. 30, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2014 [Member] | Mar. 21, 2014 Quartermaster Plaza [Member] Mortgage Loan Payable Maturing October 2014 [Member] | Jul. 18, 2014 Carbondale Plaza [Member] Subsequent Event [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  | $ 92,300,000 |  |  |  |  |
Mortgage amount |  |  |  | 53,400,000 |  | 42,100,000 |  | 11,300,000 |
Mortgage interest rate |  |  |  |  |  | 5.30% |  | 5.50% |
Mortgage maturity date |  |  | Oct. 01, 2014 |  | Oct. 01, 2015 |  | Oct. 01, 2014 |  |
Sales price of real estate sold |  |  |  |  |  |  |  |  | 10,700,000
Acquisition costs | 2,870,000 |  |  |  |  |  |  |  |
Assets of properties held for sale/conveyance | 37,400,000 |  |  |  |  |  |  |  |
Liabilities of properties held for sale/conveyance | 7,700,000 |  |  |  |  |  |  |  |
Mortgage loans payable - real estate held for sale/conveyance | 6,618,000 | 29,832,000 |  |  |  |  |  |  |
Unamortized intangible lease liabilities - real estate held for sale/conveyance | $ 1,092,000 | $ 5,463,000 |  |  |  |  |  |  |

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- Definition Total carrying amount of mortgage loans in connection with real estate held for sale as of the balance sheet date. + References No definition available. + Details
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- Definition Purchase Price Of Acquired Property + References No definition available. + Details
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- Definition Real Estate Held For Sale, Assets + References No definition available. + Details
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- Definition Real Estate Held For Sale, Liabilities + 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=21917927&loc=d3e1043-128460 + 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: 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=6584090&loc=d3e28878-108400 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 + Details
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- Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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