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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of stock-based compensation

​

​	​	​	​	​	​	​	​	​	​
​	​	Years Ended December 31,
​		2020			2019			2018
Stock-based compensation expense	​	$	12,272	​	$	7,327	​	$	9,703

Disclosure of compensation related costs

​

​	​	​	​	​	​
​	​	2020
​	​	​		Weighted-
​	​	​	​	Average
​	​	​	​	Grant
​		Shares	​	Value
RSUs outstanding at beginning of period		534	​	$	56.56
RSUs granted		342	​		59.51
RSUs vested		(152)	​		57.14
RSUs forfeited		(116)	​		58.10
RSUs outstanding at end of period		608	​	$	58.15

Schedule of shares authorized under stock option plans, by exercise price range

The following table summarizes information about the stock options outstanding on December 31, 2020:

​

​	​	​	​	​	​	​	​
​	​	Options Outstanding and Exercisable
​	​	​	​	Weighted-Average	​	Weighted-
​	​	Number	​	Remaining	​	Average
Range of Exercise Prices		Outstanding		Contractual Life		Exercise Price
$9.51 to $12.44		5		0.67 years	​	$	11.18
$18.77		43		3.75 years	​		18.77
$26.32		99		4.10 years	​		26.32
$9.51 to $26.32		147		3.89 years	​	$	23.63

Employee Stock [Member]

Schedule of valuation assumptions

The fair value of each purchase right granted under the ESPP was estimated on the date of grant using the Black-Scholes-Merton option pricing model with the following assumptions:

​

​	​	​	​	​	​	​	​
​	​	Years Ended December 31,					​
​		2020		2019		2018
Risk-free interest rates		0.10% - 0.18%	%	1.62% - 2.31	%	2.10% - 2.56	%
Expected dividend yield rates		—	%	—	%	—	%
Expected term		0.5 years		0.5 years		0.5 years	​
Expected volatility		70.1	%	41.3	%	38.0	%

Time Based [Member]

Schedule of stock options roll forward

Changes in our outstanding stock options were as follows:

​

​	​	​	​	​	​
​	​	2020
​	​	​		Weighted-
​	​	​	​	Average
​	​	​	​	Exercise
​		Shares	​	Price
Options outstanding at beginning of period		185	​	$	21.56
Options exercised		(33)	​		13.43
Options forfeited		—	​		—
Options expired		(5)	​		15.43
Options outstanding at end of period		147	​	$	23.63

Schedule of restricted stock and restricted stock units activity

​

​	​	​	​	​	​	​	​
​	​	Options Outstanding and Exercisable
​	​	​	​	Weighted-Average	​	Weighted-
​	​	Number	​	Remaining	​	Average
Range of Exercise Prices		Outstanding		Contractual Life		Exercise Price
$9.51 to $12.44		5		0.67 years	​	$	11.18
$18.77		43		3.75 years	​		18.77
$26.32		99		4.10 years	​		26.32
$9.51 to $26.32		147		3.89 years	​	$	23.63

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