Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 27, 2014	Sep. 28, 2013
Cash flows from operating activities:
Net income	$ 280,328	$ 308,421
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for doubtful accounts on accounts receivable	2,051	1,646
Provisions on inventory	3,603	3,346
Stock-based compensation	24,460	23,985
Deferred income taxes	(9,151)	(11,181)
Depreciation	38,754	27,807
Amortization of intangibles	35,889	30,448
Change in operating assets and liabilities, net of acquisitions:
Decrease in accounts receivable	23,588	22,585
Increase in inventories	(36,812)	(30,782)
Increase in other current assets	(9,348)	(6,171)
Increase in other assets	(10,949)	(9,638)
Increase (decrease) in accounts payable and other current liabilities	3,887	(24,686)
Increase in deferred revenue and customer advances	23,737	14,266
Decrease in other liabilities	(20,111)	(8,461)
Net cash provided by operating activities	349,926	341,585
Cash flows from investing activities:
Additions to property, plant, equipment and software capitalization	(70,437)	(92,816)
Business acquisitions, net of cash acquired	(23,672)	(26,434)
Payments for intellectual property licenses	(1,800)
Purchase of investments	(1,731,043)	(2,270,826)
Maturity of investments	1,504,528	2,060,710
Net cash used in investing activities	(322,424)	(329,366)
Cash flows from financing activities:
Proceeds from debt issuances	336,430	1,002,023
Payments on debt	(229,770)	(886,043)
Payments of debt issuance costs	(1,400)	(2,039)
Proceeds from stock plans	43,287	35,470
Purchase of treasury shares	(261,570)	(226,198)
Excess tax benefit related to stock option plans	8,605	8,864
(Payments for) proceeds from debt swaps and other derivative contracts	(366)	5,866
Net cash used in financing activities	(104,784)	(62,057)
Effect of exchange rate changes on cash and cash equivalents	(6,546)	(196)
Decrease in cash and cash equivalents	(83,828)	(50,034)
Cash and cash equivalents at beginning of period	440,796	481,035
Cash and cash equivalents at end of period	$ 356,968	$ 431,001

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.