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Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Entity Location [Line Items]
Income tax benefit as a result of the Tax Act		$ (27.3)
UNITED STATES
Entity Location [Line Items]
Effective tax rate	35.00%		26.80%	35.00%
MEXICO
Entity Location [Line Items]
Effective tax rate			30.00%
GUATEMALA
Entity Location [Line Items]
Effective tax rate			25.00%
EL SALVADOR
Entity Location [Line Items]
Effective tax rate			30.00%
COLOMBIA
Entity Location [Line Items]
Effective tax rate			37.00%

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-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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