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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2021

STOCK-BASED COMPENSATION

Summary of restricted stock activity

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average Grant
​		Shares		Date Fair Value
Nonvested stock at December 31, 2020		342,082	​	$	108.40
Granted		296,941	​	​	92.17
Vested		(161,305)	​	​	106.44
Forfeited		(10,042)	​	​	95.85
Nonvested stock at September 30, 2021		467,676	​	$	99.04

Summary of performance-based restricted stock units

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average Grant
​		Shares		Date Fair Value
Nonvested stock at December 31, 2020		122,666	​	$	115.18
Granted		71,302	​	​	98.32
Vested		(29,468)	​	​	111.45
Forfeited		(2,318)	​	​	116.73
Nonvested stock at September 30, 2021		162,182	​	$	108.42

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of the changes in outstanding nonvested shares.

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-Topic 718
-SubTopic 10
-Section 50
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