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Segments and Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financial information of business segments
Revenues	$ 73,779	$ 69,712	$ 219,505	$ 224,518
Segment operating expenses	27,663	27,486	82,678	77,371
Segment reconciling items	(28,476)	(27,758)	(85,741)	(89,386)
Operating income (loss)	17,640	14,468	51,086	57,761
Interest and other income (expense), net	(2,578)	(3,608)	(8,417)	(22,187)
Income (Loss) before income taxes	15,062	10,860	42,669	35,574
MID Segment
Financial information of business segments
Revenues	55,383	52,495	164,696	172,314
Segment operating expenses	11,734	10,337	36,055	28,655
Segment Operating Income (Loss)	43,649	42,158	128,641	143,659
CRD Segment
Financial information of business segments
Revenues	12,246	11,255	36,849	36,929
Segment operating expenses	6,653	7,356	21,317	21,076
Segment Operating Income (Loss)	5,593	3,899	15,532	15,853
Other
Financial information of business segments
Revenues	6,150	5,962	17,960	15,275
Segment operating expenses	9,276	9,793	25,306	27,640
Segment Operating Income (Loss)	(3,126)	(3,831)	(7,346)	(12,365)
Operating Segments [Member]
Financial information of business segments
Segment Operating Income (Loss)	$ 46,116	$ 42,226	$ 136,827	$ 147,147

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