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Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 22, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Entity Location [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) |  |  | $ 27.3 |
UNITED STATES |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% | 25.3572% |  | 37.512%
MEXICO |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 30.00% |  |
GUATEMALA |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 25.00% |  |
EL SALVADOR |  |  |  |
Entity Location [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 30.00% |  |

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