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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2021
CUSTOMER CONTRACTS, TRADENAMES AND TRADEMARKS, AND OTHER INTANGIBLE ASSETS  
The changes in the carrying amount of goodwill

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​

​

​

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(in thousands)

    

​

    

Goodwill at December 31, 2019

    

$

572,847

Goodwill acquired

​

 

73,430

Goodwill adjustments due to currency translation

​

 

6,899

Goodwill at December 31, 2020

​

 

653,176

Goodwill acquired

​

 

69,264

Goodwill adjustments due to currency translation

​

 

(621)

Goodwill at December 31, 2021

​

$

721,819