Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss - Changes in AOCI (Details)

v3.10.0.1
Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 272,673  
Ending Balance 526,510  
Unrealized Gains and Losses on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance   $ (391)
Other comprehensive income (loss) before reclassifications   (94)
Amounts reclassified from accumulated other comprehensive loss   163
Net current period other comprehensive (loss) income   69
Ending Balance   (322)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (6,478) (15,442)
Other comprehensive income (loss) before reclassifications (29,445) 6,957
Net current period other comprehensive (loss) income (29,445) 6,957
Ending Balance (35,923) (8,485)
Unrealized Gains and Losses on Derivative Instruments [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Other comprehensive income (loss) before reclassifications (135)  
Amounts reclassified from accumulated other comprehensive loss 254  
Net current period other comprehensive (loss) income 119  
Ending Balance 119  
Accumulated other comprehensive income (loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (6,478) (15,833)
Other comprehensive income (loss) before reclassifications (29,580) 6,863
Amounts reclassified from accumulated other comprehensive loss 254 163
Net current period other comprehensive (loss) income (29,326) 7,026
Ending Balance $ (35,804) $ (8,807)