Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 10,280	$ 11,938
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,562	6,050
Share-based compensation expense	3,313	3,691
Excess tax benefits from stock-based awards	(180)	(40)
Loss on disposal of assets	0	1
Deferred income tax provision	(2,953)	(2,228)
Changes in operating assets and liabilities
Accounts receivable	(7,852)	(4,563)
Inventories	(930)	(95)
Income taxes receivable	1,737	6,912
Prepaid expenses and other assets	(539)	(8)
Accounts payable	(7,452)	(1,125)
Income taxes payable	533	553
Other current liabilities	1,019	(933)
Deferred income on shipments to distributors	6,212	95
Net cash provided by operating activities	9,750	20,248
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of PhaseLink’s net assets, net of cash acquired	0	(16,439)
Purchases of property, plant and equipment	(3,853)	(4,085)
Purchases of intangible assets	(57)	0
Purchases of investments	(35,785)	(30,596)
Proceeds from sale and maturities of investments	47,500	24,818
Change in restricted cash	165	0
Net cash provided by (used in) investing activities	7,970	(26,302)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	0	(282)
Proceeds from the issuance of common stock	2,355	1,473
Repurchases of common stock	(4,690)	(14,694)
Payment of cash dividends	(2,482)	(4,905)
Purchase of stock for withholding taxes on vested restricted stock	(327)	(115)
Excess tax benefits from stock-based awards	180	40
Net cash used in financing activities	(4,964)	(18,483)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	12,756	(24,537)
CASH AND CASH EQUIVALENTS - Beginning of period	27,281	60,610
CASH AND CASH EQUIVALENTS - End of period	$ 40,037	$ 36,073