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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
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