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Income taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Tax loss carryforwards $ 178,993 $ 238,082
Purchase price allocation adjustment 17,006 24,437
Property and equipment, tax inflation 38,588 37,577
Other accrued payroll and other liabilities 30,300 30,730
Share-based compensation 2,591 3,850
Provision for contingencies 2,708 2,478
Other deferred tax assets 26,193 21,528
Other deferred tax liabilities (7,979) (10,670)
Property and equipment - difference in depreciation rates (11,103) (12,639)
Valuation allowance (219,920) (271,651)
Net deferred tax asset 57,377 63,722
Operating Loss Carryforwards [Line Items]    
Operating tax loss carryforwards 649,312  
Expire Between 2015 and 2019    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 151,343  
Expire After 2019    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 211,043  
No Expiration Period    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 286,926  
Puerto Rico    
Operating Loss Carryforwards [Line Items]    
Foreign currency translation adjustment 4,967 3,782
Brazil, Mexico, and Colombia    
Operating Loss Carryforwards [Line Items]    
Income tax provision 10,458 9,824
Argentina and Brazil    
Operating Loss Carryforwards [Line Items]    
Foreign currency translation adjustment $ 4,736  
Venezuela    
Operating Loss Carryforwards [Line Items]    
Foreign currency translation adjustment   $ 698