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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 3,195 | $ 4,183 | $ 4,574
Charged to Cost and Expenses | 621 | 190 | 823
Charged to Other Accounts | 76 |  |
Deductions, Actual Charge-Offs | (1,218) | (1,178) | (1,214)
Balance at End of Period | $ 2,674 | $ 3,195 | $ 4,183

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