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Acquisition Payable	12 Months Ended
Acquisition Payable	Dec. 31, 2017
Text Block [Abstract]
Acquisition Payable	11. Acquisition Payable In April 2014, the Company acquired a 75% majority stake in its European business. 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 during the year ended December 31, 2016 was $6,738, of which $5,993 was recorded in connection with the acceleration of the buyout. The remaining acquisition payable recorded on the Consolidated Balance Sheets was $0 and $3,537 at December 31, 2017 and 2016, respectively.