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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Financial information of business segments |  |
Revenues | $ 46,426 | $ 97,351
Segment operating expenses | 41,365 | 41,389
Segment reconciling items | (48,674) | (42,528)
Operating income (loss) | (43,613) | 13,434
Interest and other income (expense), net | 4,695 | (3,052)
Income (Loss) before income taxes | (38,918) | 10,382
MID Segment |  |
Financial information of business segments |  |
Revenues | 33,967 | 70,595
Segment operating expenses | 22,949 | 20,255
Segment Operating Income (Loss) | 11,018 | 50,340
RSD Segment |  |
Financial information of business segments |  |
Revenues | 10,018 | 23,205
Segment operating expenses | 12,786 | 12,399
Segment Operating Income (Loss) | (2,768) | 10,806
Other |  |
Financial information of business segments |  |
Revenues | 2,441 | 3,551
Segment operating expenses | 5,630 | 8,735
Segment Operating Income (Loss) | (3,189) | (5,184)
Operating Segments [Member] |  |
Financial information of business segments |  |
Segment Operating Income (Loss) | $ 5,061 | $ 55,962

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- Definition Total operating income loss for reporting segments. + References No definition available. + Details
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