Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Cash flows from operating activities:
Net income	$ 26,202	$ 24,137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	11,959	12,829
Amortization of acquired intangible assets	3,195	2,985
Share-based compensation expense	23,029	22,039
Accretion of debt discount	8,599	6,514
Loss on extinguishment of debt	0	27,177
Contingent compensation expense	2,921	1,204
Incremental tax benefit related to stock options exercised	(9,494)	(10,000)
Deferred income taxes	(5,323)	6,636
Change in fair value of contingent consideration	1,737	270
Other non-cash adjustments	2,484	2,425
Changes in operating assets and liabilities:
Accounts receivable	(29,158)	(11,112)
Inventory	159	(3,950)
Prepaid expenses and other current assets	1,231	(5,445)
Other assets	(2,126)	(3,093)
Accounts payable	10,259	(630)
Accrued liabilities	14,223	17,683
Other long-term liabilities	4,413	(951)
Unrealized loss on foreign exchange	1,130	(140)
Net cash provided by operating activities	65,440	88,578
Cash flows from investing activities:
Purchases of available-for-sale securities	(331,652)	(360,657)
Sales of available-for-sale securities	188,766	217,133
Maturities of available-for-sale securities	21,600	61,839
Net cash paid for acquisitions	0	(58,302)
Purchases of strategic investments	(7,500)	(475)
Purchases of property and equipment	(13,084)	(12,300)
Cash paid for intangible assets	0	(114)
Net cash used in investing activities	(141,870)	(152,876)
Cash flows from financing activities:
Payments on current portion of long-term debt	0	(253,135)
Proceeds from issuance of convertible notes	0	786,000
Incremental tax benefit related to stock options exercised	9,494	10,000
Common stock repurchases	0	(338,320)
Proceeds from the exercise of warrants	0	5,512
Proceeds from issuance of common stock	24,122	15,424
Net cash provided by financing activities	33,616	225,481
Effect of exchange rate changes on cash and cash equivalents	30	211
Net (decrease) increase in cash and cash equivalents	(42,784)	161,394
Cash and cash equivalents at beginning of period	302,978	248,947
Cash and cash equivalents at end of period	$ 260,194	$ 410,341