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]||
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
The entire disclosure for valuation and qualifying accounts and reserves.
Reference 1: http://www.xbrl.org/2003/role/disclosureRef