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Basis of Presentation and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Revenue From Contract With Customer [Abstract]

Schedule of Gross Billings Based on Billing of Clients Affiliates

Gross Billings, based on the billing address of the clients or client affiliates, were as follows (in thousands):

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2018				2017				2018				2017
US		$	479,489			$	337,134			$	1,282,178			$	843,557
International			89,255				59,370				242,519				146,286
Total		$	568,744			$	396,504			$	1,524,697			$	989,843

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