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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On April 27, 2017, we completed the acquisition of Outbound Solutions, Inc., which provides software that allows companies to deliver intelligent, behavior-based messages across multiple channels, for cash consideration. The acquisition will be accounted for as a business combination. We are in the process of evaluating the impact of the business combination on our consolidated financial statements.