Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss - Changes in AOCI (Details)

v3.8.0.1
Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance $ 272,673  
Ending Balance 525,076  
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   (39)
Amounts reclassified from accumulated other comprehensive loss   168
Net current period other comprehensive income   129
Ending Balance   (262)
Foreign Currency Items [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Beginning Balance (6,478) (15,442)
Other comprehensive income (loss) before reclassifications 2,495 1,951
Net current period other comprehensive income 2,495 1,951
Ending Balance (3,983) (13,491)
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 2,495 1,912
Amounts reclassified from accumulated other comprehensive loss   168
Net current period other comprehensive income 2,495 2,080
Ending Balance $ (3,983) $ (13,753)