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Fair Value of Financial Instruments (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Level 1 |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | $ 2,791
Level 1 | Fixed Income Funds |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 818
Level 1 | Stock Index Funds | Small Cap |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 281
Level 1 | Stock Index Funds | Mid Cap |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 284
Level 1 | Stock Index Funds | Large Cap |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 567
Level 1 | Stock Index Funds | International |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 841
Level 2 |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | 42
Level 2 | Mexican Peso Forward Contracts |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Total Assets at Fair Value | $ 42

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