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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Additional Paid-in Capital | [1] | Treasury Stock | Accumulated Deficit | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) | Total Groupon, Inc. Stockholders' Equity | Total Groupon, Inc. Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment | Non-controlling Interests
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Beginning balance (in shares) at Dec. 31, 2018 | [1] |  |  | 38,046,972 |  |  | (9,592,756,000) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | $ 382,612 |  | $ 4 | [1] | $ 2,234,633 | $ (877,491) | [1] | $ (1,010,499) |  | $ 34,602 | $ 381,249 |  | $ 1,363
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (35,695) |  |  |  |  |  |  | (42,487) |  | 3,313 | (39,174) |  | 3,479
Exercise in stock options (in shares) | [1] |  |  | 625 |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | 8 |  |  |  | 8 |  |  |  |  |  | 8 |  |
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 208,020 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units and performance share units |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | [1] |  |  | 35,964 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan |  | 1,998 |  |  |  | 1,998 |  |  |  |  |  | 1,998 |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) | [1] |  |  | (79,286) |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards |  | (5,681) |  |  |  | (5,681) |  |  |  |  |  | (5,681) |  |
Payments for repurchase of common stock (in shares) | [1] |  |  |  |  |  | (220,399,000) |  |  |  |  |  |  |
Payments for repurchase of common stock |  | (15,055) |  |  |  |  | $ (15,055) | [1] |  |  |  | (15,055) |  |
Stock-based compensation on equity-classified awards |  | 17,731 |  |  |  | 17,731 |  |  |  |  |  | 17,731 |  |
Distributions to noncontrolling interest holders |  | (3,521) |  |  |  |  |  |  |  |  |  |  |  | (3,521)
Ending balance (in shares) at Mar. 31, 2019 | [1] |  |  | 38,212,295 |  |  | (9,813,155,000) |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 |  | 342,397 |  | $ 4 | [1] | 2,248,689 | $ (892,546) | [1] | (1,052,986) |  | 37,915 | 341,076 |  | 1,321
Beginning balance (in shares) at Dec. 31, 2018 | [1] |  |  | 38,046,972 |  |  | (9,592,756,000) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 |  | 382,612 |  | $ 4 | [1] | 2,234,633 | $ (877,491) | [1] | (1,010,499) |  | 34,602 | 381,249 |  | 1,363
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (76,770) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 | [1] |  |  | 38,357,786 |  |  | (10,024,562,000) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 |  | 306,140 |  | $ 4 | [1] | 2,271,673 | $ (907,599) | [1] | (1,093,232) |  | 34,485 | 305,331 |  | 809
Beginning balance (in shares) at Mar. 31, 2019 | [1] |  |  | 38,212,295 |  |  | (9,813,155,000) |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 |  | 342,397 |  | $ 4 | [1] | 2,248,689 | $ (892,546) | [1] | (1,052,986) |  | 37,915 | 341,076 |  | 1,321
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (41,075) |  |  |  |  |  |  | (40,246) |  | (3,430) | (43,676) |  | 2,601
Exercise in stock options (in shares) | [1] |  |  | 1,500 |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  | 32 |  |  |  | 32 |  |  |  |  |  | 32 |  |
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 220,211 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units and performance share units |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) | [1] |  |  | (76,220) |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards |  | (5,387) |  |  |  | (5,387) |  |  |  |  |  | (5,387) |  |
Payments for repurchase of common stock (in shares) | [1] |  |  |  |  |  | (211,407,000) |  |  |  |  |  |  |
Payments for repurchase of common stock |  | (15,053) |  |  |  |  | $ (15,053) | [1] |  |  |  | (15,053) |  |
Stock-based compensation on equity-classified awards |  | 28,339 |  |  |  | 28,339 |  |  |  |  |  | 28,339 |  |
Distributions to noncontrolling interest holders |  | (3,113) |  |  |  |  |  |  |  |  |  |  |  | (3,113)
Ending balance (in shares) at Jun. 30, 2019 | [1] |  |  | 38,357,786 |  |  | (10,024,562,000) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 |  | 306,140 |  | $ 4 | [1] | 2,271,673 | $ (907,599) | [1] | (1,093,232) |  | 34,485 | 305,331 |  | 809
Beginning balance (in shares) at Dec. 31, 2019 | [1] |  |  | 38,584,854 |  |  | (10,294,117) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 |  | 395,046 | $ (79) | $ 4 | [1] | 2,310,393 | $ (922,666) | [1] | (1,032,876) | $ (79) | 39,081 | 393,936 | $ (79) | 1,110
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (212,439) |  |  |  |  |  |  | (213,522) |  | (1,961) | (215,483) |  | 3,044
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 165,705 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units and performance share units |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | [1] |  |  | 28,621 |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan |  | 1,163 |  |  |  | 1,163 |  |  |  |  |  | 1,163 |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) | [1] |  |  | (67,135) |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards |  | (3,684) |  |  |  | (3,684) |  |  |  |  |  | (3,684) |  |
Stock-based compensation on equity-classified awards |  | 15,345 |  |  |  | 15,345 |  |  |  |  |  | 15,345 |  |
Distributions to noncontrolling interest holders |  | (3,845) |  |  |  |  |  |  |  |  |  |  |  | (3,845)
Ending balance (in shares) at Mar. 31, 2020 | [1] |  |  | 38,712,045 |  |  | (10,294,117) |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 |  | 191,507 |  | $ 4 | [1] | 2,323,217 | $ (922,666) | [1] | (1,246,477) |  | 37,120 | 191,198 |  | 309
Beginning balance (in shares) at Dec. 31, 2019 | [1] |  |  | 38,584,854 |  |  | (10,294,117) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 |  | 395,046 | $ (79) | $ 4 | [1] | 2,310,393 | $ (922,666) | [1] | (1,032,876) | $ (79) | 39,081 | 393,936 | $ (79) | 1,110
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (293,183) |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 | [1] |  |  | 38,977,677 |  |  | (10,294,117) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 |  | 117,484 |  | $ 4 | [1] | 2,329,599 | $ (922,666) | [1] | (1,318,594) |  | 29,488 | 117,831 |  | (347)
Beginning balance (in shares) at Mar. 31, 2020 | [1] |  |  | 38,712,045 |  |  | (10,294,117) |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 |  | 191,507 |  | $ 4 | [1] | 2,323,217 | $ (922,666) | [1] | (1,246,477) |  | 37,120 | 191,198 |  | 309
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) |  | (80,744) |  |  |  |  |  |  | (72,117) |  | (7,632) | (79,749) |  | (995)
Vesting of restricted stock units and performance share units (in shares) | [1] |  |  | 430,100 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units and performance share units |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued under employee stock purchase plan |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards (in shares) | [1] |  |  | (164,468) |  |  |  |  |  |  |  |  |  |
Tax withholdings related to net share settlements of stock-based compensation awards |  | (4,554) |  |  |  | (4,554) |  |  |  |  |  | (4,554) |  |
Stock-based compensation on equity-classified awards |  | 10,936 |  |  |  | 10,936 |  |  |  |  |  | 10,936 |  |
Receipts from noncontrolling interest holders |  | 339 |  |  |  |  |  |  |  |  |  |  |  | 339
Ending balance (in shares) at Jun. 30, 2020 | [1] |  |  | 38,977,677 |  |  | (10,294,117) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 |  | $ 117,484 |  | $ 4 | [1] | $ 2,329,599 | $ (922,666) | [1] | $ (1,318,594) |  | $ 29,488 | $ 117,831 |  | $ (347)
[1] | All share information and balances have been retroactively adjusted to reflect a reverse stock split. See Note 7, Stockholders' Equity and Compensation Arrangements, for additional information.

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