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Income taxes (Schedule of Statutory Tax Rates) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 42.70% | 35.50% | 35.40%
Puerto Rico |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 20.00% | 20.00% | 20.00%
Martinique, French Guyana, Guadeloupe |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 33.00% | 35.00% | 35.00%
St Croix, St. Thomas |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 23.00% | 35.00% | 35.00%
Aruba |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 25.00% | 35.00% | 35.00%
Curacao |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 22.00% | 35.00% | 35.00%
Argentina |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 30.00% | 35.00% | 35.00%
Brazil and Venezuela |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 34.00% | 34.00% | 34.00%
Colombia |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 37.00% | 40.00% | 40.00%
Peru |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 30.00% | 30.00% | 28.00%
Costa Rica and Mexico |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 30.00% | 30.00% | 30.00%
Panamá, Uruguay, Trinidad and Tobago and Netherlands |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 25.00% | 25.00% | 25.00%
Ecuador |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 28.00% | 25.00% | 25.00%
Chile |  |  |
Income Taxes [Line Items] |  |  |
Statutory tax rate (as a percent) | 27.00% | 26.00% | 24.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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