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Income Taxes - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Sep. 30, 2018	Sep. 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 (percent)	35.00%		26.00%	33.90%
MEXICO
Entity Location [Line Items]
Effective tax rate (percent)			30.00%
GUATEMALA
Entity Location [Line Items]
Effective tax rate (percent)			25.00%
EL SALVADOR
Entity Location [Line Items]
Effective tax rate (percent)			30.00%
COLOMBIA
Entity Location [Line Items]
Effective tax rate (percent)			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).

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