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Schedule II - Valuation and Qualifying Accounts (Details) - Reserve for Uncollectible Accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement in Reserve [Roll Forward]    
Balance at beginning of year $ 655,000 $ 305,000
Additions - charged to cost and expenses 377,685 613,556
Additions - recoveries 52,527 54,653
Deductions 230,212 318,209
Balance at end of year $ 855,000 $ 655,000