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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of year | $ 8,328 | $ 52,924 | $ 218,399
Acquisitions | 0 | 0 | 0
Amounts charged to income | 13,458 | 21,715 | 42,287
Amounts written off | 21,786 | 66,311 | 207,762
Balance at end of year | $ 0 | $ 8,328 | $ 52,924

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