Segment, Product and Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	$ 802,917	$ 691,789	$ 840,542
Segment operating income (loss)	59,235	30,672	72,725
Non operating income, net	183	2,195	12,769
Consolidated earnings before income taxes	59,418	32,867	85,494
Significant noncash items:
Share Based Compensation	1,186	1,818	1,929
Depreciation and amortization	13,756	14,164	14,592
Driver Ic [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	641,865	560,399	672,068
Segment operating income (loss)	92,010	59,506	92,290
Significant noncash items:
Share Based Compensation	542	1,206	1,341
Depreciation and amortization	3,685	3,591	3,449
Non-driver products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment revenues	161,052	131,390	168,474
Segment operating income (loss)	(32,775)	(28,834)	(19,565)
Significant noncash items:
Share Based Compensation	644	612	588
Depreciation and amortization	$ 10,071	$ 10,573	$ 11,143

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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No definition available.

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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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No definition available.

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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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