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Acquisition Payment Expense—Boost ETP, LLP
12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Disclosure of Acquisition Payment Expense
16. Acquisition Payment Expense—Boost ETP, LLP
In April 2014, the Company acquired a 75% majority stake in U.K. based ETP sponsor Boost ETP, LLP. Under the terms of the agreement, the remaining 25% was to be acquired on or about March 31, 2018. In May 2016, the Company accelerated the buyout of the remaining minority interest. Acquisition payment expense recognized in connection with the buyout of the remaining minority interest was $6,738 during the year ended December 31, 2016.