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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Statement of Comprehensive Income [Abstract]    
Net income $ 111,951 $ 105,557
Other comprehensive income:    
Foreign currency translation 23,913 29,141
Unrealized (losses) gains on investments before income taxes (2,976) 588
Income tax benefit (expense) 93 (22)
Unrealized (losses) gains on investments, net of tax (2,883) 566
Retirement liability adjustment before reclassifications (385) (456)
Amounts reclassified to other income 907 836
Retirement liability adjustment before income taxes 522 380
Income tax expense (116) (344)
Retirement liability adjustment, net of tax 406 36
Other comprehensive income 21,436 29,743
Comprehensive income $ 133,387 $ 135,300