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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

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