Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Notes)

v3.20.4
Schedule II - Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Col. A   Col. B Col. C Col. D   Col. E
    Balance at
Beginning
of Period		 Charged to
Costs and
Expenses		 Charged to
Other Operating Revenue		 Deductions
-Described		   Balance at
End of
Period
Year ended December 31, 2020
   Allowance for doubtful accounts $ 1,316  $ 567  $ —  $ 615 
2
 $ 1,268 
   Allowance for revenue adjustments 1
737  —  4,751  4,483 
3
 1,005 
Deferred tax valuation allowance 395  —  —  —  395 
2,448  567  4,751  5,098  2,668 
Year ended December 31, 2019
   Allowance for doubtful accounts $ 1,290  $ 752  $ —  $ 726 
2
 $ 1,316 
   Allowance for revenue adjustments 1
755  —  3,339  3,357 
3
 737 
Deferred tax valuation allowance 395  —  —  —  395 
2,440  752  3,339  4,083  2,448 
Year ended December 31, 2018
   Allowance for doubtful accounts $ 2,540  $ 122  $ —  $ 1,372 
2
 $ 1,290 
   Allowance for revenue adjustments 1
451  —  3,624  3,320 
3
 755 
Deferred tax valuation allowance 360  35  —  —  395 
3,351  157  3,624  4,692  2,440 
1 Represents an allowance for revenue adjustments to accounts receivable resulting from future billing rate changes.
2 Represents uncollectible accounts written off, net of recoveries.
3 Represents adjustments to billed accounts receivable