CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Cash flows from operating activities:
Net income (loss)	$ 260,197	$ (173,560)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	32,474	32,168
Amortization	22,412	37,180
Stock-based compensation	17,312	15,457
Provision for excess and obsolete inventory	5,295	12,115
Contingent consideration fair value adjustment	2,133	2,478
Deferred taxes	(3,563)	(21,458)
Retirement plan actuarial gains	(2,504)	(1,862)
Goodwill impairment		254,946
Acquired intangible assets impairment		83,339
Impairment of fixed assets		4,179
Property insurance recovery		(5,051)
Other	1,153	576
Changes in operating assets and liabilities:
Accounts receivable	(214,189)	(138,230)
Inventories	(8,149)	30,222
Prepayments and other assets	4,425	(13,657)
Accounts payable and other accrued expenses	34,504	(6,040)
Deferred revenue and customer advances	5,312	106,072
Retirement plan contributions	(1,983)	(2,298)
Income taxes	14,363	6
Net cash provided by operating activities	169,192	216,582
Cash flows from investing activities:
Purchases of property, plant and equipment	(45,967)	(46,593)
Purchases of available-for-sale marketable securities	(334,819)	(437,311)
Proceeds from sales of available-for-sale marketable securities	313,254	334,798
Proceeds from maturities of available-for-sale marketable securities	307,607	128,024
Proceeds from property insurance		5,051
Net cash provided by (used for) investing activities	240,075	(16,031)
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	15,215	17,896
Repurchase of common stock	(94,328)	(56,783)
Dividend payments	(27,925)	(24,425)
Payments related to net settlement of employee stock compensation awards	(12,438)	(9,152)
Payments of contingent consideration	(1,050)	(11,697)
Net cash used for financing activities	(120,526)	(84,161)
Effects of exchange rate changes on cash and cash equivalents	1,724
Increase in cash and cash equivalents	290,465	116,390
Cash and cash equivalents at beginning of period	307,884	264,705
Cash and cash equivalents at end of period	$ 598,349	$ 381,095