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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 June 30,

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Six Months Ended June 30,

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​

2020

2019

2020

2019

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Stock-based compensation expense

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$

2,837

​

$

937

​

$

5,885

​

$

4,136

​

Summary of stock option activity

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​	​	​	​	​	​	​
​	​	Six Months Ended June 30, 2020				​
​		​		Weighted-		​
​	​	​	​	Average		​
​	​	​	​	Grant Date		​
​	​	Number of RSUs	​	Fair Value		​
RSUs outstanding at beginning of period		534	​	$	56.56
RSUs granted		335	​	$	59.01
RSUs vested		(142)	​	$	56.86
RSUs forfeited		(15)	​	$	60.55
RSUs outstanding at end of period		712	​	$	57.57

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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​	​	​	​	​	​	​
​	​	Six Months Ended June 30, 2020				​
​		​		Weighted-		​
​	​	​	​	Average		​
​	​	Number of	​	Exercise Price		​
​	​	Options	​	per Share		​
Options outstanding at beginning of period		185	​	$	21.56
Options exercised		(18)	​	$	14.63
Options forfeited		—	​	$	—
Options expired		(4)	​	$	15.91
Options outstanding at end of period		163	​	$	22.46

X

- 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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