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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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		282,966	​	​	90.42
Vested		(156,273)	​	​	106.84
Forfeited		(5,496)	​	​	95.72
Nonvested stock at June 30, 2021		463,279	​	$	98.09

Summary of performance-based restricted stock unit

​

​	​	​	​	​	​
​	​	​	​	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 June 30, 2021		162,182	​	$	108.42

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of the changes in outstanding nonvested shares.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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