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Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) shares
Right of use asset	$ 18,997
Operating lease liabilities	23,822
Acquisition Of Etfs Business [Member]
Non-cash consideration transferred	270,000
Deferred consideration	$ 172,746
Common Stock [Member]
Business acquisition, number of shares to be issued | shares	15,250,000
Series A Non-Voting Convertible Preferred Stock [Member] | Acquisition Of Etfs Business [Member]
Business acquisition, number of shares to be issued | shares	14,750

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Present value of lessee's discounted obligation for lease payments from operating lease.

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