CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Net income (loss)	$ 63,794	$ 71,453	$ (109,767)	$ 207,118
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $0, $0, $0, $0	1,843	3,267	7,072	(3,000)
Available-for-sale marketable securities:
Unrealized (losses) gains on marketable securities arising during period, net of tax of $51, $48, $2,405, $(896), respectively	(336)	283	5,110	(593)
Less: Reclassification adjustment for gains included in net income, net of tax of $(150), $(126), $(152), $(335), respectively	(334)	(247)	(468)	(808)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total	(670)	36	4,642	(1,401)
Defined benefit pension and post-retirement plans:
Amortization of net prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax of $(46), $(42), $(139), $(127), respectively	(81)	(74)	(244)	(221)
Prior service income arising during period, net of tax of $0, $0, $34, $0, respectively			59
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(81)	(74)	(185)	(221)
Other comprehensive income (loss)	1,092	3,229	11,529	(4,622)
Comprehensive income (loss)	$ 64,886	$ 74,682	$ (98,238)	$ 202,496