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COMPENSATION ARRANGEMENTS (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
The stock-based compensation expense related to stock awards issued under the Plans and acquisition-related awards are presented within the following line items of the consolidated statements of operations for the years ended December 31, 2021, 2020 and 2019 (in thousands):
Year Ended December 31,
202120202019
Cost of revenue $585 $662 $1,482 
Marketing748 1,522 5,809 
Selling, general and administrative31,836 36,826 74,324 
Restructuring and related charges— 1,735 — 
Total stock-based compensation expense $33,169 $40,745 $81,615 
We capitalized $3.7 million, $4.5 million and $7.1 million of stock-based compensation for the years ended December 31, 2021, 2020 and 2019, in connection with internally-developed software and cloud computing arrangements.
Schedule of Restricted Stock Unit Activity
The table below summarizes restricted stock unit activity under the Plans for the year ended December 31, 2021:
Restricted Stock UnitsWeighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 20201,853,007 $31.91 
Granted2,150,963 31.48 
Vested(1,229,689)30.26 
Forfeited(569,046)36.69 
Unvested at December 31, 20212,205,235 $31.06 
Share-based Payment Arrangement, Performance Shares, Outstanding Activity
The table below summarizes Performance Share Unit activity under the Plans for the year ended December 31, 2021:
Performance Share UnitsWeighted-Average Grant Date Fair Value (per unit)Market-based Performance Share UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020124,709 $29.73 57,668 $60.60 
Granted (1)
41,729 15.44 — — 
Vested(90,006)26.46 — — 
Forfeited(38,669)23.24 — — 
Unvested at December 31, 202137,763 $28.39 57,668 $— 
Maximum shares issuable upon vesting at December 31, 2021
37,763 57,668 
(1)    Performance Share Units granted during the year ended December 31, 2021 relate to the issuance of incremental shares upon the Compensation Committee's certification of the achievement of the 2020 performance metrics.