CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 20,453	$ 27,901
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,472	5,800
Amortization of intangibles	486	334
Gain on sale of property and equipment	(41)	(349)
Stock-based compensation expense	4,948	4,543
Amortization of premium on held to maturity investments	859	858
Deferred income taxes	826	710
Increase (decrease) in accounts receivable allowances	37	(18)
Excess tax benefit from stock options exercised	(697)	(891)
Tax benefit associated with employee stock plans	1,538	2,040
Change in operating assets and liabilities:
Accounts receivable	(2,392)	3,492
Inventories	7,915	(9,460)
Prepaid expenses and other assets	3,048	3,562
Accounts payable	(4,260)	4,453
Taxes payable and accrued liabilities	1,468	3,006
Deferred income on sales to distributors	(1,021)	5,885
Net cash provided by operating activities	40,639	51,866
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(12,519)	(13,513)
Proceeds from sale of property and equipment	2,249	1,415
Other assets	(808)	0
Acquisition (Note 14)	(6,914)	0
Increase in financing lease receivables	(7,821)	0
Collections of financing lease receivable	205	0
Note to third party	(3,000)	(4,750)
Purchases of held-to-maturity investments	(11,508)	(27,224)
Proceeds from maturities of held-to-maturity investments	6,630	18,150
Net cash used in investing activities	(33,486)	(25,922)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	14,246	15,463
Repurchase of common stock	(4,384)	(13,960)
Retirement of shares for income tax withholding	0	(769)
Payments of dividends to stockholders	(2,885)	(2,768)
Excess tax benefit from stock options exercised	697	891
Net cash provided by (used in) financing activities	7,674	(1,143)
NET INCREASE IN CASH AND CASH EQUIVALENTS	14,827	24,801
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	155,667	134,974
CASH AND CASH EQUIVALENTS AT END OF PERIOD	170,494	159,775
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	3,510	1,711
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	0	1
Cash paid for income taxes, net of refunds	$ 310	$ 614