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SCHEDULE II - VALUATION RESERVES
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II – VALUATION RESERVES
 
Description
Balance at beginning
of year		Additions to costs and expenses
 
Deductions
Balance
at end
of year
Year ended December 31, 2020    
Reserve deducted in the balance sheet from the assets to which it applies    
Allowance for doubtful accounts$3,714 $815 $(747)$3,782 
Year ended December 31, 2019    
Reserve deducted in the balance sheet from the assets to which it applies    
Allowance for doubtful accounts$3,404 $821 $(511)$3,714 
Year ended December 31, 2018    
Reserve deducted in the balance sheet from the assets to which it applies    
Allowance for doubtful accounts$2,974 $541 $(111)$3,404