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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financial information of business segments |  |  |  |
Revenues | $ 99,134 | $ 89,855 | $ 291,205 | $ 239,038
Segment operating expenses | 40,728 | 39,393 | 126,787 | 103,898
Segment reconciling items | (41,396) | (38,646) | (125,730) | (102,022)
Operating income (loss) | 17,010 | 11,816 | 38,688 | 33,118
Interest and other income (expense), net | (3,079) | (3,051) | (9,263) | (7,975)
Income (Loss) before income taxes | 13,931 | 8,765 | 29,425 | 25,143
MID Segment |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 68,787 | 63,142 | 206,784 | 171,154
Segment operating expenses | 21,130 | 20,060 | 65,187 | 44,797
Segment Operating Income (Loss) | 47,657 | 43,082 | 141,597 | 126,357
RSD Segment |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 26,312 | 22,532 | 72,883 | 53,040
Segment operating expenses | 11,796 | 12,493 | 36,409 | 37,507
Segment Operating Income (Loss) | 14,516 | 10,039 | 36,474 | 15,533
Other |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 4,035 | 4,181 | 11,538 | 14,844
Segment operating expenses | 7,802 | 6,840 | 25,191 | 21,594
Segment Operating Income (Loss) | (3,767) | (2,659) | (13,653) | (6,750)
Operating Segments [Member] |  |  |  |
Financial information of business segments |  |  |  |
Segment Operating Income (Loss) | $ 58,406 | $ 50,462 | $ 164,418 | $ 135,140

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