CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 34,273	$ 26,446
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,670	12,235
Amortization of intangibles	5,051	5,247
Loss on disposal of property and equipment	216	270
Stock-based compensation expense	15,217	11,502
Amortization of premium on marketable securities	484	809
Deferred income taxes	490	152
Increase in accounts receivable allowances	303	128
Tax shortfall associated with employee stock plans	0	189
Change in operating assets and liabilities:
Accounts receivable	(7,164)	888
Inventories	1,993	9,995
Prepaid expenses and other assets	(1,403)	4,278
Accounts payable	9,037	(2,035)
Taxes payable and accrued liabilities	(2,241)	(3,579)
Deferred income on sales to distributors	1,233	1,241
Net cash provided by operating activities	70,159	67,388
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(8,074)	(7,619)
Payments to Acquire Buildings	0	(10,389)
Payment for acquisition, net of cash acquired	0	(15,549)
Purchases of marketable securities	(122,398)	(14,933)
Proceeds from sales and maturities of marketable securities	75,128	37,459
Net cash used in investing activities	(55,344)	(11,031)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of common stock under employee stock plans	8,672	6,902
Repurchase of common stock	(6,435)	(53,731)
Payments of dividends to stockholders	(11,254)	(10,501)
Net cash used in financing activities	(9,017)	(57,330)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	5,798	(973)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	90,092	60,708
CASH AND CASH EQUIVALENTS AT END OF PERIOD	95,890	59,735
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Unpaid property and equipment	891	3,216
Loan applied to CamSemi purchase price	0	6,600
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	$ 4,709	$ 1,007