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Derivative Financial Instruments and Fair Value Measurements (Schedule of Fair Value Measurements) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016
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Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent Consideration | $ (4,548) | $ (8,904) | $ (11,320) | $ (11,153) | $ (15,130) | $ (15,279)
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Inventories Carried At Market | 3,542 |  | 3,838 |  |  |
Contingent Consideration | (4,548) |  | (11,320) |  |  |
Embedded Derivative | 2,532 |  | 2,690 |  |  |
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset Notional Amount | 384 |  | (1,060) |  |  |
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets At Fair Value | (36) |  | (435) |  |  |
Fair Value, Measurements, Recurring [Member] | Short [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 2,586 |  | 738 |  |  |
Unrealized Derivative Liability | (771) |  | (240) |  |  |
Fair Value, Measurements, Recurring [Member] | Long [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 26 |  | 0 |  |  |
Unrealized Derivative Liability | (104) |  | (4) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Inventories Carried At Market | 0 |  | 0 |  |  |
Contingent Consideration | 0 |  | 0 |  |  |
Embedded Derivative | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset Notional Amount | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets At Fair Value | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 62 |  | 0 |  |  |
Unrealized Derivative Liability | 0 |  | (35) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Long [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 0 |  | 0 |  |  |
Unrealized Derivative Liability | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Inventories Carried At Market | 3,542 |  | 3,838 |  |  |
Contingent Consideration | 0 |  | 0 |  |  |
Embedded Derivative | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset Notional Amount | 384 |  | (1,060) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets At Fair Value | (36) |  | (435) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 2,524 |  | 738 |  |  |
Unrealized Derivative Liability | (771) |  | (205) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Long [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 26 |  | 0 |  |  |
Unrealized Derivative Liability | (104) |  | (4) |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Inventories Carried At Market | 0 |  | 0 |  |  |
Contingent Consideration | (4,548) |  | (11,320) |  |  |
Embedded Derivative | 2,532 |  | 2,690 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset Notional Amount | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Assets At Fair Value | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Short [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 0 |  | 0 |  |  |
Unrealized Derivative Liability | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Long [Member] | Future And Forward Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized Derivative Asset | 0 |  | 0 |  |  |
Unrealized Derivative Liability | $ 0 |  | $ 0 |  |  |

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