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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 3,304 | $ 1,879 | $ 2,453
Charged to Costs and Expenses | 3,487 | 2,996 | 1,538
Removal of Uncollectible Receivables | (1,305) | (1,377) | (1,795)
Translation Adjustments Increase (Decrease) | (13) | (194) | (317)
Balance at the End of Period | 5,473 | 3,304 | 1,879
Valuation allowance for deferred income taxes |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 65,649 | 68,479 | 19,032
Charged to Costs and Expenses | 128,938 | (2,830) | 49,447
Other | 2,436 | 0 | 0
Translation Adjustments Increase (Decrease) | 1,429 | 0 | 0
Balance at the End of Period | $ 198,452 | $ 65,649 | $ 68,479

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