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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2021
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

The following schedule provides the activity for accounts receivable reserves and valuation allowance for deferred tax assets for the years ended December 31, 2021, 2020 and 2019 (in thousands):

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Balance at

​

Charged to

​

​

​

​

​

​

​

​

beginning of

​

costs and

​

​

​

​

Balance at

​

   

period

   

expenses

   

Write-offs

   

end of period

Accounts receivable reserves:

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 2021

​

$

817

​

$

1,030

​

$

(404)

​

$

1,443

Year ended December 31, 2020

​

​

1,289

​

​

1,130

​

​

(1,602)

​

​

817

Year ended December 31, 2019

​

​

1,243

​

​

1,126

​

​

(1,080)

​

​

1,289

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Net additions

​

Exchange rate

​

​

​

​

​

Balance at

​

charged to

​

fluctuations

​

​

​

​

​

beginning of

​

income

​

and other

​

Balance at

​

    

period

    

(expense)

    

items

    

end of period

Valuation allowance for deferred tax assets:

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 2021

​

$

10,237

​

$

4,768

​

$

(489)

​

$

14,516

Year ended December 31, 2020

​

​

8,586

​

​

2,174

​

​

(523)

​

​

10,237

Year ended December 31, 2019

​

​

8,962

​

​

(138)

​

​

(238)

​

​

8,586

​