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Investments in Preferred Stock (Tables)
6 Months Ended
Jun. 30, 2017
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 six months ended June 30, 2017.
 
Six Months Ended 
 June 30, 2017
Beginning balance
$
129,545

Purchase of preferred stock
766

Dividend income from investments in preferred stock
7,980

Unrealized appreciation in the fair value of the investments in preferred stock
6,451

Ending balance
$
144,742