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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Jan. 01, 2018
Allowance for doubtful accounts receivable |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at Beginning of Period | $ 28,756 | $ 27,678 | $ 23,682 |  |
Charged to Expenses | 4,200 | 9,868 | 11,914 |  |
Deductions | (7,906) | (8,687) | (8,690) |  |
Translation Adjustments | (120) | (103) | 772 |  |
Balance at End of Period | 19,617 | 28,756 | 27,678 |  |
Liability recognized in accordance with ASC 606 | (19,617) | (28,756) | (27,678) | $ (23,443) |
Allowance for doubtful accounts receivable | Accounting Standards Update 2014-09 |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Liability recognized in accordance with ASC 606 |  |  |  |  | $ 9,500
Deferred tax valuation allowance |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |
Balance at Beginning of Period | 21,618 | 23,072 | 20,178 |  |
Charged to Expenses | 3,462 | 719 | 5,683 |  |
Deductions | (2,333) | (2,154) | (2,599) |  |
Translation Adjustments | 1,385 | (19) | (190) |  |
Balance at End of Period | 24,132 | 21,618 | 23,072 |  |
Liability recognized in accordance with ASC 606 | $ (24,132) | $ (21,618) | $ (23,072) |  |

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