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COMPENSATION ARRANGEMENTS (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
The stock-based compensation expense related to stock awards issued under the 2011 Plan and acquisition-related awards are presented within the following line items of the Consolidated Statements of Operations for the years ended December 31, 2022, 2021 and 2020 (in thousands):
Year Ended December 31,
202220212020
Cost of revenue $395 $585 $662 
Marketing1,054 748 1,522 
Selling, general and administrative28,557 31,836 36,826 
Restructuring and related charges— — 1,735 
Total stock-based compensation expense $30,006 $33,169 $40,745 
Schedule of Restricted Stock Unit Activity
The table below summarizes restricted stock unit activity under the 2011 Plan for the year ended December 31, 2022:
Restricted Stock UnitsWeighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 20212,205,235 $31.06 
Granted2,720,990 16.95 
Vested(1,080,881)32.22 
Forfeited(969,255)24.82 
Unvested at December 31, 20222,876,089 $19.33 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity
The table below summarizes Performance Share Unit activity under the 2011 Plan for the year ended December 31, 2022:
Performance Share UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 202137,763 $28.39 
Granted— — 
Vested(20,494)31.97 
Forfeited— — 
Unvested at December 31, 202217,269 $24.13 
Maximum shares issuable upon vesting at December 31, 2022
17,269