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STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2020
STOCK-BASED COMPENSATION  
Summary of stock option activity

    

    

 

Weighted

 

Average

 

Number of

Exercise

 

    

Shares

    

Price

 

Outstanding, December 31, 2018

 

369,483

$

26.40

Exercised

 

358,649

 

26.63

Outstanding, December 31, 2019

 

10,834

$

18.59

Exercised

 

10,834

18.59

Outstanding and exercisable December 31, 2020

$

Summary of restricted stock activity

Weighted

 

Number of

average grant 

 

    

shares

    

date fair value

 

Nonvested stock at December 31, 2019

 

436,013

$

91.58

Granted

 

193,912

115.89

Vested

 

(272,258)

88.32

Forfeited

 

(15,585)

106.70

Nonvested stock at December 31, 2020

 

342,082

$

108.40

Summary of performance-based restricted stock unit

Weighted

Number of

Average Grant 

    

Shares

    

Date Fair Value

Nonvested stock at December 31, 2019

 

132,248

$

107.21

Granted

 

72,975

125.62

Vested

 

(48,053)

108.91

Forfeited

 

(34,504)

109.85

Nonvested stock at December 31, 2020

 

122,666

$

115.18