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Stockholders' Equity and Compensation Arrangements Groupon, Inc. Stock Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 30,376,307  
Share-based Compensation [1] $ 30,756 $ 35,144
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount 2,200 $ 3,100
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 175,700  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 1 month 25 days  
Employee Stock Purchase Plan, shares authorized 10,000,000  
Employee Stock Purchase Plan, issued shares 618,319 328,644
Continuing Operations [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 30,800 $ 35,100
Discontinued Operations [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation   $ 1,100
[1] Includes stock-based compensation classified within cost of revenue, marketing expense, selling, general and administrative expense and restructuring charges. Other income (expense), net, includes $0.2 million of additional stock-based compensation for the three months ended March 31, 2016.