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Segments and Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial information of business segments
Revenue	$ 76,773	$ 73,779	$ 72,812	$ 72,914	$ 72,040	$ 69,712	$ 76,518	$ 78,288	$ 296,278	$ 296,558	$ 271,501
Segment operating expenses									108,983	102,530	97,451
Segment operating income (loss)									187,295	194,028	174,050
Reconciling items									(115,875)	(118,682)	(151,586)
Operating income (loss)	$ 20,334	$ 17,640	$ 15,554	$ 17,892	$ 17,585	$ 14,468	$ 20,104	$ 23,189	71,420	75,346	22,464
Interest income and other income (expense), net									(11,189)	(25,096)	(34,481)
Income before income taxes									60,231	50,250	(12,017)
MID
Financial information of business segments
Revenue									221,968	226,303	232,040
Segment operating expenses									47,780	40,816	34,823
Segment operating income (loss)									174,188	185,487	197,217
CRD
Financial information of business segments
Revenue									50,497	49,330	32,625
Segment operating expenses									29,056	27,608	20,322
Segment operating income (loss)									21,441	21,722	12,303
Other
Financial information of business segments
Revenue									23,813	20,925	6,836
Segment operating expenses									32,147	34,106	42,306
Segment operating income (loss)									$ (8,334)	$ (13,181)	$ (35,470)

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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)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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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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-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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