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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2018
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 three months ended June 30, 2018 and 2017 totaled $14.6 million and $17.0 million, respectively, and $28.4 million and $33.0 million for the six months ended June 30, 2018 and 2017, respectively.