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Related-Party Transactions	12 Months Ended
Related-Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related-Party Transactions	Note 16. Related-Party Transactions In the ordinary course of business, the Company made purchases from Google Inc., at which one of the Company’s directors serves as President, Americas. Total payables to Google Inc. at December 31, 2017 and 2016 were $1.1 million and $1.0 million, respectively. Total expenses incurred from Google Inc. in 2017, 2016, and 2015 were $15.4 million, $14.2 million, and $11.9 million, respectively.