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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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