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Significant Tenants (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Real Estate Properties [Line Items] |  |
Real estate revenue, net (in dollars) | $ 49,468,000 | $ 48,775,000
Sales Revenue Services Net [Member] |  |
Real Estate Properties [Line Items] |  |
Percentage Rent Contributed By Tenant | 10.00% |
Bloomberg [Member] | Customer Concentration Risk [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate revenue, net (in dollars) | $ 22,017,000 | $ 21,802,000
Bloomberg [Member] | Customer Concentration Risk [Member] | Sales Revenue Services Net [Member] |  |
Real Estate Properties [Line Items] |  |
Percentage Rent Contributed By Tenant | 45.00% | 45.00%

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- Definition The aggregate revenue from real estate operations during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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