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Contingent Liabilities (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Standby Letters of Credit [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | $ 7.5
Surety Bonds [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | 2.3
Bank Guaranties [Member] |
Line of Credit Facility [Line Items] |
Loss contingency, range of possible loss, portion not accrued | $ 1.7

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