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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at the Beginning of the Period | $ 3,541 | $ 3,161 | $ 2,989
Charged to Costs and Expenses | 782 | 923 | 235
Deductions from Reserve | (697) | (543) | (63)
Balance at the End of the Period | 3,626 | 3,541 | 3,161
Deferred tax valuation allowance |  |  |
VALUATION AND QUALIFYING ACCOUNTS |  |  |
Balance at the Beginning of the Period | 11,189 | 5,414 | 4,070
Charged to Costs and Expenses | 12,058 | 4,230 | 3,640
Charged to Other Accounts | 1,508 | 2,604 |
Deductions from Reserve | (1,435) | (1,059) | (2,296)
Balance at the End of the Period | $ 23,320 | $ 11,189 | $ 5,414

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