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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2020
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

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The following schedule provides the activity for accounts receivable reserves and valuation allowance for deferred tax assets for the years ended December 31, 2020, 2019 and 2018 (in thousands):

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​

​

​

​

​

​

​

​

​

​

​

​

​

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Balance at

​

Charged to

​

​

​

​

​

​

​

​

beginning of

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costs and

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​

​

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Balance at

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period

   

expenses (income)

   

Write-offs

   

end of period

Accounts receivable reserves:

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​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 2020

​

$

1,289

​

$

1,130

​

$

(1,602)

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$

817

Year ended December 31, 2019

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​

1,243

​

​

1,126

​

​

(1,080)

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​

1,289

Year ended December 31, 2018

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​

1,109

​

​

1,244

​

​

(1,110)

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​

1,243

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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​

​

​

​

​

​

​

​

​

​

​

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Net additions

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Exchange rate

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​

​

​

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Balance at

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charged to

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fluctuations

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​

​

​

​

beginning of

​

expense

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and other

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Balance at

​

    

period

    

(benefit)

    

items

    

end of period

Valuation allowance for deferred tax assets:

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​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 2020

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$

8,586

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$

2,174

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$

(523)

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$

10,237

Year ended December 31, 2019

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​

8,962

​

​

(138)

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​

(238)

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​

8,586

Year ended December 31, 2018

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​

11,986

​

​

(1,922)

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​

(1,102)

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​

8,962

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