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Significant Tenants (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Real Estate Properties [Line Items] |  |  |  |
Total revenues | $ 47,302 | $ 46,878 | $ 96,077 | $ 94,179
Bloomberg [Member] | Customer Concentration Risk [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Total revenues |  |  | $ 43,322 | $ 42,395
Percentage Rent Contributed By Tenant |  |  | 45.00% | 45.00%

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