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Valuation and qualifying accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 263,087 | $ 243,660 | $ 273,968
Additions | 26,671 | 83,405 | 28,694
Deductions | (53,567) | (53,719) | (54,912)
Translation | (14,992) | (10,259) | (4,090)
Balance at end of period | 221,199 | 263,087 | 243,660
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 943 | 23,076 | 25,539
Additions | 814 | 937 | 8,524
Deductions | (787) | (22,929) | (10,892)
Translation | (96) | (141) | (95)
Balance at end of period | 874 | 943 | 23,076
Allowance for doubtful accounts | Accounts Receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 585 |  |
Balance at end of period | 542 | 585 |
Allowance for doubtful accounts | Other receivables |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 358 |  |
Balance at end of period | 332 | 358 |
Valuation allowance on deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 235,196 | 194,426 | 219,920
Additions | 2,403 | 65,077 | 2,375
Deductions | (38,992) | (18,870) | (26,252)
Translation | (12,368) | (5,437) | (1,617)
Balance at end of period | 186,239 | 235,196 | 194,426
Provision for contingencies |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 26,948 | 26,158 | 28,509
Additions | 23,454 | 17,391 | 17,795
Deductions | (13,788) | (11,920) | (17,768)
Translation | (2,528) | (4,681) | (2,378)
Balance at end of period | 34,086 | 26,948 | 26,158
Legal Reserve Accrual |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Additions | 22,555 | 15,330 | 17,441
Legal Reserve Reclassifications |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Additions | 899 | 2,061 |
Legal Reserve Settlements |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Deductions | $ (13,788) | $ (11,920) | $ (17,768)

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