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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock-based compensation

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Three Months Ended September 30,

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Nine Months Ended September 30,

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2020

2019

2020

2019

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Stock-based compensation expense

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$

3,781

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$

917

​

$

9,666

​

$

5,053

​

Summary of stock option activity

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​	​	​	​	​	​	​
​	​	Nine Months Ended September 30, 2020				​
​		​		Weighted-		​
​	​	​	​	Average		​
​	​	​	​	Grant Date		​
​	​	Number of RSUs	​	Fair Value		​
RSUs outstanding at beginning of period		534	​	$	56.56
RSUs granted		336	​	$	59.33
RSUs vested		(150)	​	$	57.16
RSUs forfeited		(38)	​	$	59.38
RSUs outstanding at end of period		682	​	$	57.97

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of stock option activity

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​	​	​	​	​	​	​
​	​	Nine Months Ended September 30, 2020				​
​		​		Weighted-		​
​	​	​	​	Average		​
​	​	Number of	​	Exercise Price		​
​	​	Options	​	per Share		​
Options outstanding at beginning of period		185	​	$	21.56
Options exercised		(32)	​	$	13.39
Options forfeited		—	​	$	—
Options expired		(4)	​	$	15.58
Options outstanding at end of period		149	​	$	23.48

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- Definition

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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