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Financial Instruments - Statement of Operations and Other Comprehensive Income (Details) - Foreign currency exchange contract [Member] - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2015
Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in OCI – effective portion $ 5,914,000 $ (13,029,000)   $ (13,987,000) $ 6,578,000
Revenue [Member] | Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) reclassified from OCI into income – effective portion         1,157,000
Operating expenses [Member] | Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) reclassified from OCI into income – effective portion         0
Other Income, Net [Member] | Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income – ineffective portion 0 0   21,000 0
Gain recognized in income – excluded time value portion 0 660,000 $ 0 843,000  
Other Income, Net [Member] | Not designated as hedging instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) recognized in income $ 4,793,000 (3,547,000)   (6,776,000) $ 2,299,000
Reclassification out of accumulated other comprehensive income [Member] | Accumulated net gain (loss) from cash flow hedges attributable to parent [Member] | Revenue [Member] | Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) reclassified from OCI into income – effective portion   (1,035,000) 1,157,000 (280,000)  
Reclassification out of accumulated other comprehensive income [Member] | Accumulated net gain (loss) from cash flow hedges attributable to parent [Member] | Operating expenses [Member] | Designated as hedging instrument [Member] | Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) reclassified from OCI into income – effective portion   $ (440,000) $ 0 $ (1,405,000)