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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has ownership interests in certain of its agents accounted for under the equity method of accounting. The Company pays these agents commissions for money transfer and other services provided on the Company's behalf. Commission expense recognized for these agents for the years ended December 31, 2017, 2016 and 2015 totaled $65.9 million, $68.0 million and $65.5 million, respectively.