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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017 (in thousands):

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Balance at

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Charged to

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beginning of

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costs and

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Balance at

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period

   

expenses

   

Write-offs

   

end of period

Accounts receivable reserves:

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Year ended December 31, 2019

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$

1,243

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$

1,126

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$

(1,080)

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$

1,289

Year ended December 31, 2018

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1,109

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1,244

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(1,110)

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1,243

Year ended December 31, 2017

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1,630

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2,173

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(2,694)

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1,109

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Net additions

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Exchange rate

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Balance at

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charged to

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fluctuations

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beginning of

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expense

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and other

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Balance at

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period

    

(benefit)

    

items

    

end of period

Valuation allowance for deferred tax assets:

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Year ended December 31, 2019

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$

8,962

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$

(138)

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$

(238)

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$

8,586

Year ended December 31, 2018

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11,986

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(1,922)

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(1,102)

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8,962

Year ended December 31, 2017

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11,125

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874

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(13)

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11,986

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