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Segments and Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financial information of business segments
Revenues	$ 46,426	$ 97,351
Segment operating expenses	41,365	41,389
Segment reconciling items	(48,674)	(42,528)
Operating income (loss)	(43,613)	13,434
Interest and other income (expense), net	4,695	(3,052)
Income (Loss) before income taxes	(38,918)	10,382
MID Segment
Financial information of business segments
Revenues	33,967	70,595
Segment operating expenses	22,949	20,255
Segment Operating Income (Loss)	11,018	50,340
RSD Segment
Financial information of business segments
Revenues	10,018	23,205
Segment operating expenses	12,786	12,399
Segment Operating Income (Loss)	(2,768)	10,806
Other
Financial information of business segments
Revenues	2,441	3,551
Segment operating expenses	5,630	8,735
Segment Operating Income (Loss)	(3,189)	(5,184)
Operating Segments [Member]
Financial information of business segments
Segment Operating Income (Loss)	$ 5,061	$ 55,962

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Total operating income loss for reporting segments.

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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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-Publisher FASB
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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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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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