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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2023

STOCK-BASED COMPENSATION

Summary of information related to stock-based incentive compensation plans

​

​	​	​	​
​	​	March 31, 2023
Shares available for future issuance under the 2017 Omnibus Incentive Plan	​	1,205	​
Shares available for future issuance under the Employee Stock Purchase Plan	​	619	​

​

Schedule of stock-based compensation

​

​	​	​	​	​	​	​
​	​	Three Months Ended March 31,
​		2023			2022
Stock-based compensation expense	​	$	6,801	​	$	3,928

​

Summary of changes in RSUs

​

​	​	​	​	​	​
​	​	Three Months Ended March 31, 2023
​		​		Weighted-
​	​	​	​	Average
​	​	Number of	​	Grant Date
​	​	RSUs	​	Fair Value
RSUs outstanding at beginning of period		803	​	$	78.46
RSUs granted		295	​	$	96.70
RSUs vested		(97)	​	$	89.09
RSUs forfeited		(25)	​	$	68.29
RSUs outstanding at end of period		976	​	$	83.00

​

Summary of changes in stock options

​

​	​	​	​	​	​	​
​	​	Three Months Ended March 31, 2023				​
​		​		Weighted-
​	​	​	​	Average		​
​	​	Number of	​	Exercise Price		​
​	​	Options	​	per Share		​
Options outstanding at beginning of period		151	​	$	55.48	​
Options exercised		(36)	​	$	24.19	​
Options outstanding at end of period		115	​	$	65.14	​

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Tabular disclosure of share-based payment arrangement.

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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 number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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