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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for uncollectible Accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | $ 0 | $ 8,328 | $ 52,924
Acquisitions | 0 | 0 | 0
Amounts charged to income | 0 | 13,458 | 21,715
Amounts written off | 0 | 21,786 | 66,311
Balance at end of year | $ 0 | $ 0 | $ 8,328

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