Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes Paid	$ 45,982	$ 52,403	$ 34,365
Cash flows from operating activities:
Net Income	55,217	86,539	91,368
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,854	16,775	14,735
Purchase premium amortization/discount accretion on investments, net	1,103	2,490	986
Non-cash stock-based compensation	17,462	14,372	13,762
Income tax benefit associated with stock option exercises	428	1,121	3,519
Gain on sale of cost method Investment	0	(3,126)	0
Excess tax benefit from stock-based compensation	(767)	(1,552)	(3,672)
Impairment charges	2,000	0	0
Deferred income taxes	(7,927)	(2,545)	(4,621)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	(10,470)	5,317	(34,576)
Inventories	(46,679)	(10,590)	(30,039)
Prepaid expenses and other assets	(4,615)	2,619	(7,935)
Accounts payable	36,250	(30,615)	28,131
Accrued employee compensation	(1,787)	(8,782)	2,765
Other accrued liabilities	15,070	3,444	9,374
Deferred revenue	(1,211)	(12,680)	12,555
Income taxes payable	(26)	(7,744)	(342)
Net cash provided by operating activities	86,902	55,043	96,010
Cash flows from investing activities:
Purchases of short-term investments	(153,464)	(369,939)	(228,871)
Proceeds from maturities of short-term investments	275,406	284,418	227,669
Purchase of property and equipment	(18,050)	(14,762)	(8,211)
Payments for patents	(275)	(1,400)	0
Cost method investment	3,890	0	0
Payments made in connection with business acquisitions	(147,240)	(28,625)	(37,509)
Net cash used in investing activities	(39,733)	(130,308)	(46,922)
Cash flows from financing activities:
Purchase and retirement of treasury stock	(63,585)	(850)	(926)
Proceeds from exercise of stock options	7,487	12,700	29,139
Proceeds from issuance of common stock under employee stock purchase plan	2,139	1,997	1,752
Excess tax benefit from stock-based compensation	767	1,552	3,672
Net cash provided by financing activities	(53,192)	15,399	33,637
Net increase (decrease) in cash and cash equivalents	(6,023)	(59,866)	82,725
Cash and cash equivalents, at beginning of period	149,032	208,898	126,173
Cash and cash equivalents, at end of period	$ 143,009	$ 149,032	$ 208,898