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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II — Valuation and Qualifying Accounts
Schedule II — Valuation and Qualifying Accounts
(In thousands)
 
Additions
  Balance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged to
Other Operating Revenue		Deductions Balance at
End of
Period
Year ended December 31, 2022
Allowance for doubtful accounts$1,734 $1,052 $— $1,258 
2
$1,528 
Allowance for revenue adjustments1
1,526 — 11,347 11,243 
3
1,630 
Deferred tax valuation allowance4,625 23 — — 4,648 
7,885 1,075 11,347 12,501 7,806 
Year ended December 31, 2021
Allowance for doubtful accounts$1,268 $1,670 $— $1,204 
2
$1,734 
Allowance for revenue adjustments1
1,005 — 7,943 7,422 
3
1,526 
Deferred tax valuation allowance395 4,230 — — 4,625 
2,668 5,900 7,943 8,626 7,885 
Year ended December 31, 2020
Allowance for doubtful accounts$1,316 $567 $— $615 
2
$1,268 
Allowance for revenue adjustments1
737 — 4,751 4,483 
3
1,005 
Deferred tax valuation allowance395 — — — 395 
2,448 567 4,751 5,098 2,668 
1 Represents an allowance for revenue adjustments resulting from future billing rate changes.
2 Represents uncollectible accounts written off, net of recoveries.
3 Represents adjustments to billed accounts receivable.