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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (280,484)	$ 155,293	$ 169,776
Foreign currency translation	27,864	1,784	(28,535)
Comprehensive (loss) income	(252,620)	157,077	141,241
Less: Comprehensive income (loss) attributable to non-controlling interest	4,289	(1,088)	1,007
Comprehensive (loss) income attributable to WEX Inc.	$ (256,909)	$ 158,165	$ 140,234

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