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Valuation and qualifying accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 243,660 $ 273,968 $ 321,074
Additions 83,405 28,694 45,009
Deductions (53,719) (54,912) (59,280)
Translation (10,259) (4,090) (32,835)
Balance at end of period 263,087 243,660 273,968
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 23,076 25,539 21,467
Additions 937 8,524 6,064
Deductions (22,929) (10,892) (1,860)
Translation (141) (95) (132)
Balance at end of period 943 23,076 25,539
Allowance for doubtful accounts | Accounts Receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 22,442    
Balance at end of period 585 22,442  
Allowance for doubtful accounts | Other receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 634    
Balance at end of period 358 634  
Valuation allowance on deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 194,426 219,920 271,651
Additions 65,077 2,375 13,107
Deductions (18,870) (26,252) (37,718)
Translation (5,437) (1,617) (27,120)
Balance at end of period 235,196 194,426 219,920
Provision for contingencies      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 26,158 28,509 27,956
Additions 17,391 17,795 25,838
Deductions (11,920) (17,768) (19,702)
Translation (4,681) (2,378) (5,583)
Balance at end of period 26,948 26,158 28,509
Legal Reserve Accrual      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 15,330 17,441 23,995
Legal Reserve Reclassifications      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 2,061 354  
Legal Reserve Settlements      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Deductions $ (11,920) $ (17,768) $ (19,702)