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
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 272,673  
Ending Balance 503,395  
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   (41)
Amounts reclassified from accumulated other comprehensive loss   163
Net current period other comprehensive income   122
Ending Balance   (269)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (6,478) (15,442)
Other comprehensive income (loss) before reclassifications (24,718) 5,191
Net current period other comprehensive income (24,718) 5,191
Ending Balance (31,196) (10,251)
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 (24,718) 5,150
Amounts reclassified from accumulated other comprehensive loss   163
Net current period other comprehensive income (24,718) 5,313
Ending Balance $ (31,196) $ (10,520)