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Organization, Properties, Basis of Presentation, Financial Instruments and Recent Accounting Standards (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of the entity's investment in real estate assets, including number of properties and rentable square feet of real estate | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of June 30, |
​ |  | 2019 |  | 2018 |
Operating Properties: | ​ | ​ | ​ | ​ | ​
Number of properties |  | 32 |  | 34 | ​
Rentable square feet |  | 9,498,858 |  | 9,760,699 | ​
Reconciliation of cash, cash equivalents, and restricted cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | June 30, |
(in thousands) | ​ | 2019 | ​ | 2018 |
Cash and cash equivalents | ​ | $ | 13,100 | ​ | $ | 10,448 | ​
Restricted cash | ​ |  | — | ​ |  | — | ​
Total cash, cash equivalents and restricted cash | ​ | $ | 13,100 | ​ | $ | 10,448 | ​

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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- Definition Tabular disclosure of real estate properties and units in those properties that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
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