Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2016
Jan. 02, 2016
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 236,397   $ 222,187 $ 198,259
Ending Balance 272,673 $ 236,397 236,397 222,187
Unrealized Gains and Losses on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (391)   (1,262) (859)
Other comprehensive income (loss) before reclassifications (37) 621   (1,097)
Amounts reclassified from accumulated other comprehensive income 428 250   694
Net current period other comprehensive income (loss) 391 871   (403)
Ending Balance   (391) (391) (1,262)
Foreign Currency Items [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (15,442)   (8,781) (3,226)
Other comprehensive income (loss) before reclassifications 8,964 (6,661)   (5,555)
Amounts reclassified from accumulated other comprehensive income 0 0   0
Net current period other comprehensive income (loss) 8,964 (6,661)   (5,555)
Ending Balance (6,478) (15,442) (15,442) (8,781)
Accumulated other comprehensive income (loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (15,833)   (10,043) (4,085)
Other comprehensive income (loss) before reclassifications 8,927 (6,040)   (6,652)
Amounts reclassified from accumulated other comprehensive income 428 250 250 694
Net current period other comprehensive income (loss) 9,355 (5,790)   (5,958)
Ending Balance $ (6,478) $ (15,833) $ (15,833) $ (10,043)