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Securities Owned/Sold but Not Yet Purchased (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Securities Owned/Sold But Not Yet Purchased
These securities consist of securities classified as trading and available-for-sale, as follows:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Securities Owned
 
 
 
 
 
 
 
 
Trading securities
 
$
8,873
 
 
$
1,691
 
Available-for-sale debt securities
 
 
—
 
 
 
64,603
 
Total
 
$
8,873
 
 
$
66,294
 
Securities Sold, but not yet Purchased
 
 
 
 
 
 
 
 
Trading securities
 
$
1,698
 
 
$
950
 
Available-for-sale debt securities
 
 
—
 
 
 
—
 
Total
 
$
1,698
 
 
$
950
 
Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities
The following table summarizes unrealized gains, losses and fair value of the available-for-sale debt securities:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Cost
 
$
—
 
 
$
65,237
 
Gross unrealized gains in other comprehensive income
 
 
—
 
 
 
—
 
Gross unrealized losses in other comprehensive income
 
 
—
 
 
 
(634
)
Fair value
 
$
—
 
 
$
64,603