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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Activity

The stock-based compensation expense related to stock awards issued under the Plans are presented within the following line items of the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 (in thousands):

			Three Months Ended March 31,
			2021						2020
Cost of revenue			$	171					$	259
Marketing			135						874
Selling, general and administrative			6,873						12,882
Total stock-based compensation expense			$	7,179					$	14,015

Schedule of Restricted Stock Unit Activity

The table below summarizes restricted stock unit activity under the Plans for the three months ended March 31, 2021:

			Restricted Stock Units						Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020			1,853,007						$	31.91
Granted			129,827						32.87
Vested			(222,244)						27.60
Forfeited			(125,053)						32.39
Unvested at March 31, 2021			1,635,537						$	32.37

Schedule of Performance and Market-based Performance Share Unit Activity

The table below summarizes Performance Share Unit activity under the Plans for the three months ended March 31, 2021:

			Performance Share Units						Weighted-Average Grant Date Fair Value (per unit)						Market-based Performance Share Units						Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020			124,709						$	29.73					57,668						$	60.60
Granted (1)			41,729						15.44						—						—
Vested			(86,710)						24.36						—						—
Forfeited			(282)						69.00						—						—
Unvested at March 31, 2021			79,446						27.95						57,668						60.60
Maximum shares issuable upon vesting at March 31, 2021			79,446												57,668

(1)Performance Share Units granted during the three months ended March 31, 2021 relate to the issuance of incremental shares upon the Compensation Committee's certification of the achievement of the 2020 performance metrics.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares.

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