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Valuation and qualifying accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 273,968 $ 321,074 $ 325,099
Additions 28,694 45,009 50,928
Deductions (54,912) (59,280) (54,896)
Translation (4,090) (32,835) (57)
Balance at end of period 243,660 273,968 321,074
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 25,539 21,467 16,367
Additions 8,524 6,064 6,386
Deductions (10,892) (1,860) (1,244)
Translation (95) (132) (42)
Balance at end of period 23,076 25,539 21,467
Allowance for doubtful accounts | Accounts Receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 24,999    
Balance at end of period 22,442 24,999  
Allowance for doubtful accounts | Other receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 540    
Balance at end of period 634 540  
Valuation allowance on deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 219,920 271,651 290,620
Additions 2,375 13,107 8,382
Deductions (26,252) (37,718) (27,515)
Translation (1,617) (27,120) 164
Balance at end of period 194,426 219,920 271,651
Provision for contingencies      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 28,509 27,956 18,112
Additions 17,795 25,838 36,160
Deductions (17,768) (19,702) (26,137)
Translation (2,378) (5,583) (179)
Balance at end of period 26,158 28,509 27,956
Legal Reserve Accrual      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 17,441 23,995 36,160
Legal Reserve Reclassifications      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 354 1,843  
Deductions 0 0 (710)
Legal Reserve Settlements      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Deductions $ (17,768) $ (19,702) $ (25,427)