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Fair Value Measurements (Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents (including money market funds) | $ 31,065 | $ 23,348 | $ 27,148 | $ 36,312
Fair value, measurements, recurring |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents (including money market funds) | 31,065 | 23,348 |  |
Derivative financial instruments | 5,146 | 3,354 |  |
Deferred stock-based compensation | 8,901 | 8,885 |  |
Fair value, measurements, recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents (including money market funds) | 31,065 | 23,348 |  |
Derivative financial instruments | 0 | 0 |  |
Deferred stock-based compensation | 0 | 0 |  |
Fair value, measurements, recurring | Significant other observable inputs (Level 2) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents (including money market funds) | 0 | 0 |  |
Derivative financial instruments | 5,146 | 3,354 |  |
Deferred stock-based compensation | 8,901 | 8,885 |  |
Fair value, measurements, recurring | Significant unobservable inputs (Level 3) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents (including money market funds) | 0 | 0 |  |
Derivative financial instruments | 0 | 0 |  |
Deferred stock-based compensation | 0 | 0 |  |
Fair value, measurements, recurring | Government securities |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 6,905 | 6,345 |  |
Fair value, measurements, recurring | Government securities | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Fair value, measurements, recurring | Government securities | Significant other observable inputs (Level 2) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 6,905 | 6,345 |  |
Fair value, measurements, recurring | Government securities | Significant unobservable inputs (Level 3) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Fair value, measurements, recurring | Corporate Bonds |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 5,425 | 6,149 |  |
Fair value, measurements, recurring | Corporate Bonds | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Fair value, measurements, recurring | Corporate Bonds | Significant other observable inputs (Level 2) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 5,425 | 6,149 |  |
Fair value, measurements, recurring | Corporate Bonds | Significant unobservable inputs (Level 3) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale debt securities | 0 | 0 |  |
Variable Rate Debt Obligation | Fair value, measurements, recurring |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 197,000 | 267,500 |  |
Variable Rate Debt Obligation | Fair value, measurements, recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 0 | 0 |  |
Variable Rate Debt Obligation | Fair value, measurements, recurring | Significant other observable inputs (Level 2) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 197,000 | 267,500 |  |
Variable Rate Debt Obligation | Fair value, measurements, recurring | Significant unobservable inputs (Level 3) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 0 | $ 0 |  |
Fixed Rate Debt Obligation | Fair value, measurements, recurring |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 100,000 |  |  |
Fixed Rate Debt Obligation | Fair value, measurements, recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 0 |  |  |
Fixed Rate Debt Obligation | Fair value, measurements, recurring | Significant other observable inputs (Level 2) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | 100,000 |  |  |
Fixed Rate Debt Obligation | Fair value, measurements, recurring | Significant unobservable inputs (Level 3) |  |  |  |
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt obligations | $ 0 |  |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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