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Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - Dividend Reinvestment and Stock Purchase Plan (DRIP) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Stockholders' Equity |  |
Issuance of common stock (in shares) | 674 | 1,036
Dividend reinvestments/stock purchases under the DRSPP | $ 64 | $ 111

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