Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Securities Owned/Sold But Not Yet Purchased

Securities Owned/Sold But Not Yet Purchased – These securities consist of securities classified as trading and AFS, as follows:

	December 31,
	2016		2015
Securities Owned
Trading securities	$	1,556	$	—
Available-for-sale securities		57,351		—
Total	$	58,907	$	—
Securities Sold, but not yet Purchased
Trading securities	$	1,248	$	—
Available-for-sale securities		—		—
Total	$	1,248	$	—

Schedule of Unrealized Gains, Losses and Fair Value of AFS Securities

The following table summarizes unrealized gains, losses and fair value of the AFS securities:

	December 31,
	2016			2015
Cost	$	57,615		$	—
Gross unrealized gains in other comprehensive income		—			—
Gross unrealized losses in other comprehensive income		(264	)		—
Fair value	$	57,351		$	—