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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)
9 Months Ended
Sep. 30, 2022
Employee stock option [Member]  
Share-Based Compensation and Benefit Plans  
Summary of stock options

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Shares

​

Weighted- Average

​

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(in thousands)

​

Exercise Price

Outstanding at December 31, 2021

 

1,206

​

$

300.09

Granted

 

124

​

 

670.98

Exercised

 

(169)

​

 

253.89

Forfeited or expired

 

(12)

​

 

456.32

Outstanding at September 30, 2022

 

1,149

​

$

345.21

Exercisable at September 30, 2022

 

808

​

$

271.82

Black-Scholes option pricing model

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September 30, 

​

    

2022

​

2021

Risk free interest rate

 

2.00

%  

​

0.81

%  

Expected life

 

6.3

Years

​

6.0

Years

Expected volatility

 

28.8

%  

​

30.0

%  

Expected dividend yield

 

—

%  

​

—

%  

Summary of activity of share-based compensation and benefit plans

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For the Three Months Ended

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For the Nine Months Ended

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​

September 30, 

​

September 30, 

​

    

2022

    

2021

    

2022

​

2021

Compensation expense for stock options awarded

​

$

4,924

​

$

4,736

​

$

15,134

​

$

15,103

Income tax benefit from compensation expense related to stock options

​

 

1,222

​

 

1,169

​

 

3,756

​

 

3,727

Restricted stock [Member]  
Share-Based Compensation and Benefit Plans  
Summary of activity of share-based compensation and benefit plans

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For the Three Months Ended

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For the Nine Months Ended

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​

September 30, 

​

September 30, 

​

    

2022

    

2021

    

2022

    

2021

Compensation expense for shares issued under the ESPP

​

$

828

​

$

832

​

$

2,429

​

$

2,264

Income tax benefit from compensation expense related to shares issued under the ESPP

​

​

205

​

​

205

​

​

603

​

​

559

Compensation expense for restricted shares awarded

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​

459

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​

401

​

​

1,350

​

​

1,177

Income tax benefit from compensation expense related to restricted awards

​

$

114

​

$

99

​

$

335

​

$

291