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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Cash flows from operating activities:
Net income	$ 109,138	$ 86,974
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	16,651	16,336
Amortization	12,942	9,204
Stock-based compensation	9,474	9,544
Deferred taxes	1,206	8,696
Provision for excess and obsolete inventory	2,397	3,522
Contingent consideration fair value adjustment	2,970	(4,968)
(Gains) losses on investments	(2,828)	1,241
Other	219	152
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	(41,706)	(140,747)
Inventories	(2,917)	(21,017)
Prepayments and other assets	(18,648)	(679)
Accounts payable and other liabilities	(53,323)	(46,706)
Deferred revenue and customer advances	6,455	9,644
Retirement plans contributions	(1,210)	(1,020)
Income taxes	(22,804)	(12,106)
Net cash provided by (used for) operating activities	18,016	(81,930)
Cash flows from investing activities:
Purchases of property, plant and equipment	(25,711)	(34,797)
Purchases of marketable securities	(375,184)	(490,324)
Proceeds from sales of marketable securities	5,440	800,671
Proceeds from maturities of marketable securities	141,201	212,698
Proceeds from life insurance	273
Acquisition of businesses, net of cash acquired	(6,970)	(25,356)
Net cash (used for) provided by investing activities	(260,951)	462,892
Cash flows from financing activities:
Issuance of common stock under stock purchase and stock option plans	14,268	10,654
Repurchase of common stock	(156,468)	(134,276)
Dividend payments	(15,627)	(17,588)
Payments related to net settlement of employee stock compensation awards	(14,318)	(19,629)
Payments of contingent consideration	(27,615)	(13,571)
Net cash used for financing activities	(199,760)	(174,410)
Effects of exchange rate changes on cash and cash equivalents	(329)	1,478
(Decrease) increase in cash and cash equivalents	(443,024)	208,030
Cash and cash equivalents at beginning of period	926,752	429,843
Cash and cash equivalents at end of period	$ 483,728	$ 637,873

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