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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Stock-based Compensation

Summary of performance share units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding as of December 31, 2023	​	503,880	​	$	33.13
Granted	​	203,000	​	​	45.06
Vested	​	(314,921)	​	​	33.90
Forfeited	​	—	​	​	—
Performance adjustment	​	119,721	​	​	34.26
Outstanding as of March 31, 2024	​	511,680	​	$	37.66

Summary of restricted stock units activity

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	Shares	​	Grant Date Fair Value
Outstanding as of December 31, 2023	​	2,443,907	​	$	22.88
Granted	​	885,674	​	​	33.70
Vested	​	(685,436)	​	​	23.06
Forfeited	​	(80,392)	​	​	25.83
Outstanding as of March 31, 2024	​	2,563,753	​	$	26.47

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted-		​	​
​	​	​		​	Weighted-		Average	​	​	​
​	​	​		​	Average		Remaining	​	​	Aggregate
​	​	​	​	​	Exercise Price		Contractual	​	​	Intrinsic
​		Shares		​	per Share		Term (in years)		​	Value
Outstanding as of December 31, 2023		1,176,750	​	$	19.48		4.3	​	$	13,297
Exercised		(200,200)	​	​	20.96	​	​	​	​	​
Cancelled		(1,000)	​	​	27.73	​	​	​	​	​
Outstanding as of March 31, 2024		975,550	​	$	19.17		4.0	​	$	19,172
Exercisable as of March 31, 2024		974,941	​	$	19.17	​	4.0	​	$	19,160

Summary of stock-based compensation

​

​	​	​	​	​	​
​	Three Months Ended March 31,
​	2024		​	2023
Selling, general and administrative	$	7,475	​	$	6,035
Total stock-based compensation expense	$	7,475	​	$	6,035

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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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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Tabular disclosure of the change in restricted stock units (RSUs).

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