Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 28, 2014	Jun. 29, 2013
Cash flows from operating activities:
Net income	$ 166,831	$ 210,373
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for doubtful accounts on accounts receivable	1,511	1,090
Provisions on inventory	2,800	2,297
Stock-based compensation	16,353	15,307
Deferred income taxes	(7,912)	(4,172)
Depreciation	21,417	18,091
Amortization of intangibles	23,800	19,593
Change in operating assets and liabilities, net of acquisitions:
Decrease in accounts receivable	28,870	25,966
Increase in inventories	(31,558)	(20,822)
Increase in other current assets	(6,838)	(2,729)
Increase in other assets	(10,545)	(8,453)
Decrease in accounts payable and other current liabilities	(5,727)	(44,107)
Increase in deferred revenue and customer advances	36,835	24,914
Decrease in other liabilities	(13,750)	(528)
Net cash provided by operating activities	222,087	236,820
Cash flows from investing activities:
Additions to property, plant, equipment and software capitalization	(44,151)	(61,276)
Business acquisitions, net of cash acquired	(3,615)
Purchase of investments	(1,178,731)	(1,563,959)
Maturity of investments	1,052,736	1,427,272
Net cash used in investing activities	(173,761)	(197,963)
Cash flows from financing activities:
Proceeds from debt issuances	76,424	961,171
Payments on debt	(6,367)	(871,043)
Payments of debt issuance costs		(1,958)
Proceeds from stock plans	40,671	19,170
Purchase of treasury shares	(185,172)	(171,079)
Excess tax benefit related to stock option plans	8,871	6,634
(Payments for) proceeds from debt swaps and other derivative contracts	(100)	4,029
Net cash used in financing activities	(65,673)	(53,076)
Effect of exchange rate changes on cash and cash equivalents	5,242	(11,771)
Decrease in cash and cash equivalents	(12,105)	(25,990)
Cash and cash equivalents at beginning of period	440,796	481,035
Cash and cash equivalents at end of period	$ 428,691	$ 455,045

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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.