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Valuation and qualifying accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 321,074 $ 325,099 $ 331,237
Additions 45,009 50,928 70,722
Deductions (59,280) (54,896) (58,663)
Translation (32,835) (57) (18,197)
Balance at end of period 273,968 321,074 325,099
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 21,467 16,367 12,768
Additions 6,064 6,386 5,367
Deductions (1,860) (1,244) (1,647)
Translation (132) (42) (121)
Balance at end of period 25,539 21,467 16,367
Allowance for doubtful accounts | Accounts Receivable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 19,791    
Balance at end of period 24,999 19,791  
Allowance for doubtful accounts | Other Receivables      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,676    
Balance at end of period 540 1,676  
Valuation allowance on deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 271,651 290,620 297,891
Additions 13,107 8,382 36,778
Deductions (37,718) (27,515) (24,967)
Translation (27,120) 164 (19,082)
Balance at end of period 219,920 271,651 290,620
Provision For Contingencies [Member]      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 27,956 18,112 20,578
Additions 25,838 36,160 28,577
Deductions (19,702) (26,137) (32,049)
Translation (5,583) (179) 1,006
Balance at end of period 28,509 27,956 18,112
Legal Reserve Accrual      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 23,995 36,160 28,577
Legal Reserve Settlements      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Deductions (19,702) (25,427) (20,554)
Legal Reserve Reclassifications      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Additions 1,843    
Deductions $ 0 $ (710) $ (11,495)