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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 97,559 | $ 89,855 | $ 76,501 | $ 72,682 | $ 76,773 | $ 73,779 | $ 72,812 | $ 72,914 | $ 336,597 | $ 296,278 | $ 296,558
Segment operating expenses |  |  |  |  |  |  |  |  | 150,712 | 108,983 | 102,530
Segment operating income (loss) |  |  |  |  |  |  |  |  | 185,885 | 187,295 | 194,028
Reconciling items |  |  |  |  |  |  |  |  | (152,243) | (115,875) | (118,682)
Operating income (loss) | $ 524 | $ 11,816 | $ 12,008 | $ 9,294 | $ 20,334 | $ 17,640 | $ 15,554 | $ 17,892 | 33,642 | 71,420 | 75,346
Interest and other income (expense), net |  |  |  |  |  |  |  |  | (11,005) | (11,189) | (25,096)
Income before income taxes |  |  |  |  |  |  |  |  | 22,637 | 60,231 | 50,250
MID |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 239,843 | 221,968 | 226,303
Segment operating expenses |  |  |  |  |  |  |  |  | 68,460 | 47,780 | 40,816
Segment operating income (loss) |  |  |  |  |  |  |  |  | 171,383 | 174,188 | 185,487
RSD |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 76,175 | 50,497 | 49,330
Segment operating expenses |  |  |  |  |  |  |  |  | 51,855 | 29,056 | 27,608
Segment operating income (loss) |  |  |  |  |  |  |  |  | 24,320 | 21,441 | 21,722
Other |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 20,579 | 23,813 | 20,925
Segment operating expenses |  |  |  |  |  |  |  |  | 30,397 | 32,147 | 34,106
Segment operating income (loss) |  |  |  |  |  |  |  |  | $ (9,818) | $ (8,334) | $ (13,181)

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