CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 58,691	$ 66,716	$ 74,253
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes	17,783	5,842	17,307
Depreciation and amortization	13,440	12,112	11,386
Stock-based compensation	21,483	19,165	16,072
Amortization of intangibles	4,371	5,365	2,800
Amortization of prepaid royalties	0	0	827
Excess tax benefit from share-based payment arrangements	(17,187)	(11,391)	(3,965)
Impairment of goodwill	36,591	0	0
Other	1,989	118	256
Changes in assets and liabilities, excluding the effects of business combinations:
Accounts receivable	(9,138)	(21,693)	(12,184)
Inventories	(5,718)	(4,058)	(508)
Prepaid expenses and other assets	(3,853)	(2,681)	(1,212)
Accounts payable	(6)	7,535	2,612
Accrued and other long-term liabilities	2,943	37,105	19,705
Deferred revenues	12,389	16,334	2,180
Net cash provided by operating activities	133,778	130,469	129,529
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition, net of cash acquired	0	(187,588)	0
Restricted cash	2,471	(4,026)	0
Purchase of property, plant and equipment	(38,333)	(30,404)	(18,031)
Purchase of marketable securities	(67,511)	0	(18,334)
Maturities of marketable securities	25,198	10,317	20,590
Proceeds from sale of equipment	0	95	0
Other assets	(125)	0	(145)
Net cash used in investing activities	(78,300)	(211,606)	(15,920)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	42,327	25,501	11,822
Common stock repurchase	(47,203)	(7,754)	0
Excess tax provision for (benefit from) share-based payment arrangements	17,187	11,391	3,965
Employees' taxes paid upon the vesting of restricted stock units	(2,106)	(1,897)	(1,080)
Net cash provided by financing activities	10,205	27,241	14,707
Effect of foreign exchange rate changes on cash and cash equivalents	28	(93)	(139)
Net increase (decrease) in cash and cash equivalents	65,711	(53,989)	128,177
Cash and cash equivalents, beginning of year	240,675	294,664	166,487
Cash and cash equivalents, end of year	$ 306,386	$ 240,675	$ 294,664