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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 24, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |  |
Purchase Obligation, Due in Next Twelve Months | $ 30,000 |  |
Purchase Obligation, Due Second Year | 0 |  |
Letters of Credit Outstanding, Amount | $ 41,621 | $ 44,300 | $ 44,400

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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