Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 17,648	$ 12,328	$ 33,860
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,122	12,465	11,178
Share-based compensation expense	7,097	7,592	5,854
Excess tax benefits from stock-based awards	(476)	(218)	(477)
Impairment of technology	0	1,000	0
Loss (gain) on disposal of assets	(33)	1	(13)
Deferred income tax provision	(3,677)	9,654	3,104
Other, net	61	0	0
Changes in operating assets and liabilities:
Accounts receivable	(1,073)	(1,135)	8,746
Inventories	208	(4,684)	455
Prepaid taxes	(544)	2,569	(136)
Prepaid expenses and other assets	(1,558)	(1,469)	(165)
Accounts payable	(8,784)	3,928	(2,576)
Income taxes payable	683	(3,508)	877
Accrued liabilities and other	2,920	(976)	(2,644)
Deferred income on shipments to distributors	1,258	(4,903)	(7,975)
Net cash provided by operating activities	26,852	32,644	50,088
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of PhaseLink's net assets, net of cash acquired	0	(17,370)	0
Purchase of Discera’s net assets	(6,122)	0	0
Purchases of property, plant and equipment	(7,325)	(9,022)	(7,277)
Purchase of intangible asset	(410)	0	0
Purchases of investments	(59,653)	(55,819)	(77,510)
Proceeds from sale and maturities of investments	71,490	60,108	40,585
Change in restricted cash	(825)	(291)	0
Net cash used in investing activities	(2,845)	(22,394)	(44,202)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	0	(282)	(2,857)
Proceeds from the issuance of common stock	4,390	3,642	12,040
Repurchases of common stock	(23,336)	(34,551)	(20,253)
Payment of cash dividends	(8,219)	(12,072)	(9,358)
Purchase of stock for withholding taxes on vested restricted stock	(812)	(534)	(63)
Excess tax benefits from stock-based awards	476	218	477
Net cash used in financing activities	(27,501)	(43,579)	(20,014)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(3,494)	(33,329)	(14,128)
CASH AND CASH EQUIVALENTS - Beginning of year	27,281	60,610	74,738
CASH AND CASH EQUIVALENTS - End of year	23,787	27,281	60,610
Cash paid during the year for:
Interest	0	2	19
Income taxes	$ 5,457	$ 7,060	$ 11,164