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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Financial information of business segments |  |
Revenues | $ 97,351 | $ 72,682
Segment operating expenses | 41,389 | 31,079
Segment reconciling items | (42,528) | (32,309)
Operating income (loss) | 13,434 | 9,294
Interest and other income (expense), net | (3,052) | (2,899)
Income (Loss) before income taxes | 10,382 | 6,395
MID Segment |  |
Financial information of business segments |  |
Revenues | 70,595 | 53,545
Segment operating expenses | 20,255 | 12,043
Segment Operating Income (Loss) | 50,340 | 41,502
RSD Segment |  |
Financial information of business segments |  |
Revenues | 23,205 | 14,101
Segment operating expenses | 12,399 | 11,910
Segment Operating Income (Loss) | 10,806 | 2,191
Other |  |
Financial information of business segments |  |
Revenues | 3,551 | 5,036
Segment operating expenses | 8,735 | 7,126
Segment Operating Income (Loss) | (5,184) | (2,090)
Operating Segments [Member] |  |
Financial information of business segments |  |
Segment Operating Income (Loss) | $ 55,962 | $ 41,603

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