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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 68,563 | $ 59,754 | $ 56,458 | $ 46,426 | $ 101,891 | $ 99,134 | $ 94,720 | $ 97,351 | $ 231,201 | $ 393,096 | $ 336,597
Segment operating expenses |  |  |  |  |  |  |  |  | 162,736 | 169,914 | 150,712
Segment operating income (loss) |  |  |  |  |  |  |  |  | 68,465 | 223,182 | 185,885
Reconciling items |  |  |  |  |  |  |  |  | (155,432) | (168,775) | (152,243)
Operating income (loss) | $ (4,200) | $ (19,167) | $ (19,987) | $ (43,613) | $ 15,719 | $ 17,010 | $ 8,244 | $ 13,434 | (86,967) | 54,407 | 33,642
Interest and other income (expense), net |  |  |  |  |  |  |  |  | 16,339 | (13,418) | (11,005)
Income before income taxes |  |  |  |  |  |  |  |  | (70,628) | 40,989 | 22,637
MID |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 168,528 | 280,704 | 239,843
Segment operating expenses |  |  |  |  |  |  |  |  | 94,999 | 86,044 | 68,460
Segment operating income (loss) |  |  |  |  |  |  |  |  | 73,529 | 194,660 | 171,383
RSD |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 60,232 | 96,663 | 76,175
Segment operating expenses |  |  |  |  |  |  |  |  | 53,177 | 50,010 | 51,855
Segment operating income (loss) |  |  |  |  |  |  |  |  | 7,055 | 46,653 | 24,320
Other |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 2,441 | 15,729 | 20,579
Segment operating expenses |  |  |  |  |  |  |  |  | 14,560 | 33,860 | 30,397
Segment operating income (loss) |  |  |  |  |  |  |  |  | $ (12,119) | $ (18,131) | $ (9,818)

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