Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 15,732	$ 39,084
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,109	10,566
Stock-based compensation expense	10,072	9,362
Provision (benefit) for deferred income taxes	(54)	(346)
Restructuring charges	5,434	3,119
Net (gain) loss on disposal of assets	(557)	118
Changes in operating assets and liabilities:
Accounts receivable	31,130	(11,684)
Inventories	(6,995)	(16,028)
Other current assets	4,086	(482)
Accounts payable	7,673	(4,793)
Other current liabilities and accrued expenses	4,344	(5,796)
Income taxes	8,276	3,540
Non-current assets	0	(8)
Net cash provided by operating activities	92,250	26,652
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(20,522)	(22,640)
Proceeds from sale of marketable securities	23,476	9,667
Proceeds from the sale of assets	2,200	0
Purchase of property and equipment	(6,676)	(14,629)
Net cash used in investing activities	(1,522)	(27,602)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on capital lease obligations	(71)	(143)
Purchase and retirement of treasury stock	(57,117)	0
Proceeds from exercise of stock options	2,669	1,796
Excess tax from stock-based compensation deduction	(634)	(572)
Net cash provided by (used in) financing activities	(55,153)	1,081
EFFECT OF CURRENCY TRANSLATION ON CASH	(2,180)	1,208
INCREASE IN CASH AND CASH EQUIVALENTS	33,395	1,339
CASH AND CASH EQUIVALENTS, beginning of period	117,639	130,914
CASH AND CASH EQUIVALENTS, end of period	151,034	132,253
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	14	36
Cash paid for income taxes	3,343	17,867
Cash received for refunds of income taxes	7,345	7,522
Cash held in banks outside the United States	$ 37,543	$ 45,233