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Income taxes (Schedule of Statutory Tax Rates) (Details)	12 Months Ended
	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

Income Taxes [Line Items]

+ References

No definition available.

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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

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