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Supplemental Financial Information
12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Supplemental Financial Information Supplemental Financial Information
Additions and deductions related to the allowance for doubtful accounts receivable for 2021, 2020 and 2019 were as follows (in thousands):
Balance at
Beginning
of Year
AdditionsDeductions
Balance at
End of Year
Allowance for doubtful accounts receivable:
Year ended December 31, 2021
$15,106 $7,862 $(6,027)$16,941 
Year ended December 31, 2020
$10,762 $10,163 $(5,819)$15,106 
Year ended December 31, 2019
$10,462 $5,079 $(4,779)$10,762