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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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