Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 44,467us-gaap_NetIncomeLoss	$ 27,376us-gaap_NetIncomeLoss	$ 47,218us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized holding loss on short-term investment	0us-gaap_UnrealizedGainLossOnInvestments	0us-gaap_UnrealizedGainLossOnInvestments	118us-gaap_UnrealizedGainLossOnInvestments
Depreciation and amortization	6,917	6,429	5,881
Gain from disposal of short-term investments	(4)	(122)	(2)
Stock-based compensation	10,347us-gaap_ShareBasedCompensation	10,262us-gaap_ShareBasedCompensation	11,802us-gaap_ShareBasedCompensation
Loss on disposal of property and equipment	18	5	26
Deferred income taxes	471	1,181	1,582
Changes in operating assets and liabilities:
Short-term investments		14,265	(12,018)
Notes and accounts receivable	2,359	5,572	2,002
Inventories	(10,410)us-gaap_IncreaseDecreaseInInventories	(1,523)us-gaap_IncreaseDecreaseInInventories	(1,828)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(678)	(403)	248
Other assets	67	(143)	590
Notes and accounts payable	(415)	(11,981)	5,644
Accrued expenses and other current liabilities	5,543	(7,415)	6,390
Income tax payable	9,507	3,520	1,362
Other liabilities	536	2,105	221
Net cash provided by operating activities	68,725	49,128	69,236
CASH FLOWS FROM INVESTING ACTIVITIES
Return of capital from long-term investments		46
Purchase of property and equipment	(11,596)	(12,772)	(4,280)
Changes in restricted assets	(3,817)	(89)	(469)
Net cash used in investing activities	(15,413)	(12,815)	(4,749)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of ordinary shares upon exercise of employee stock options	514	422	224
Share repurchase		(10,018)
Dividends paid	(20,224)us-gaap_PaymentsOfDividends	(19,897)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	(19,710)	(29,493)	224
NET INCREASE IN CASH AND CASH EQUIVALENTS	33,602	6,820	64,711
EFFECT OF EXCHANGE RATE CHANGES	(1,111)	166	1,260
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	161,720	154,734	88,763
CASH AND CASH EQUIVALENTS, END OF YEAR	194,211	161,720	154,734
SUPPLEMENTAL INFORMATION
Interest paid	71us-gaap_InterestPaid	86us-gaap_InterestPaid
Income taxes paid	$ 5,892us-gaap_IncomeTaxesPaid	$ 2,947us-gaap_IncomeTaxesPaid	$ 3,256us-gaap_IncomeTaxesPaid

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) and income tax credits.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

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No definition available.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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Amount of increase (decrease) in the fair value of equity or debt securities classified as trading.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle.

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No definition available.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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