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Investments in Preferred Stock (Tables)
3 Months Ended
Mar. 31, 2018
Investment in Preferred Stock [Abstract]  
Schedule of Changes in Level 3 Investments
The following table summarizes the changes in the Level 3 investments in preferred stock during the three months ended March 31, 2018.
 
Three Months Ended 
 March 31, 2018
Beginning balance
$
161,225

Dividend income from investments in preferred stock
4,883

Net unrealized depreciation in the fair value of the investments in preferred stock
(39
)
Ending balance
$
166,069