Segment, Product and Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	$ 685,167	$ 802,917	$ 691,789
Segment operating income (loss)	8,150	59,235	30,672
Non operating income, net	22,188	183	2,195
Consolidated earnings before income taxes	30,338	59,418	32,867
Significant noncash items:
Share Based Compensation	1,098	1,186	1,818
Depreciation and amortization	16,680	13,756	14,164
Driver Ic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	529,847	641,865	560,399
Segment operating income (loss)	43,021	92,010	59,506
Significant noncash items:
Share Based Compensation	365	542	1,206
Depreciation and amortization	4,940	3,685	3,591
Non-driver products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	155,320	161,052	131,390
Segment operating income (loss)	(34,871)	(32,775)	(28,834)
Significant noncash items:
Share Based Compensation	733	644	612
Depreciation and amortization	$ 11,740	$ 10,071	$ 10,573

No definition available.

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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 income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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