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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Statement of Income Captions [Line Items]
Income (loss) from continuing operations	$ (286,562)	$ (14,292)	$ 1,988
Other comprehensive income (loss) from continuing operations:
Other comprehensive income (loss)	(35,972)	4,479	2,597
Comprehensive income (loss)	(322,152)	(7,216)	4,585
Comprehensive income attributable to noncontrolling interests	(1,751)	(10,682)	(13,067)
Comprehensive income (loss) attributable to Groupon, Inc.	(323,903)	(17,898)	(8,482)
Continuing Operations
Condensed Statement of Income Captions [Line Items]
Income (loss) from continuing operations	(286,562)	(14,292)	1,988
Other comprehensive income (loss) from continuing operations:
Net change in unrealized gain (loss) on foreign currency translation adjustments	(35,972)	4,858	3,332
Net change in unrealized gain (loss) on available-for-sale securities (net of tax effect of $0, $0 and $34 for the years ended December 31, 2020, 2019, and 2018)	0	(379)	(735)
Other comprehensive income (loss)	(35,972)	4,479	2,597
Comprehensive income (loss)	(322,534)	(9,813)	4,585
Discontinued Operations
Other comprehensive income (loss) from continuing operations:
Other comprehensive income (loss)	382	2,597	0
Income (loss) from discontinued operations	$ 382	$ 2,597	$ 0

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