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Segments and Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financial information of business segments
Revenues	$ 72,682	$ 72,914
Segment operating expenses	31,079	26,118
Segment reconciling items	(32,309)	(28,904)
Operating income (loss)	9,294	17,892
Interest and other income (expense), net	(2,899)	(2,951)
Income (Loss) before income taxes	6,395	14,941
MID Segment
Financial information of business segments
Revenues	53,545	54,733
Segment operating expenses	12,043	11,520
Segment Operating Income (Loss)	41,502	43,213
CRD Segment
Financial information of business segments
Revenues	14,101	12,826
Segment operating expenses	11,910	7,339
Segment Operating Income (Loss)	2,191	5,487
Other
Financial information of business segments
Revenues	5,036	5,355
Segment operating expenses	7,126	7,259
Segment Operating Income (Loss)	(2,090)	(1,904)
Operating Segments [Member]
Financial information of business segments
Segment Operating Income (Loss)	$ 41,603	$ 46,796

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Total operating income loss for reporting segments.

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Segment reconciling items

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51673353&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 10
-Article 5

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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