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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 57,282	$ 33,860	$ 146,056	$ 79,576
Changes in investment securities, net of tax (benefit) expense of $(10) and $53 for the three and nine months ended September 30, 2017, respectively	0	(12)	0	97
Foreign currency translation	(9,250)	11,042	(32,728)	33,744
Comprehensive income	48,032	44,890	113,328	113,417
Less: Comprehensive (loss) income attributable to non-controlling interest	(109)	122	540	(112)
Comprehensive income attributable to WEX Inc.	$ 48,141	$ 44,768	$ 112,788	$ 113,529

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