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Segments and Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 76,773 | $ 73,779 | $ 72,812 | $ 72,914 | $ 72,040 | $ 69,712 | $ 76,518 | $ 78,288 | $ 296,278 | $ 296,558 | $ 271,501
Segment operating expenses |  |  |  |  |  |  |  |  | 108,983 | 102,530 | 97,451
Segment operating income (loss) |  |  |  |  |  |  |  |  | 187,295 | 194,028 | 174,050
Reconciling items |  |  |  |  |  |  |  |  | (115,875) | (118,682) | (151,586)
Operating income (loss) | $ 20,334 | $ 17,640 | $ 15,554 | $ 17,892 | $ 17,585 | $ 14,468 | $ 20,104 | $ 23,189 | 71,420 | 75,346 | 22,464
Interest income and other income (expense), net |  |  |  |  |  |  |  |  | (11,189) | (25,096) | (34,481)
Income before income taxes |  |  |  |  |  |  |  |  | 60,231 | 50,250 | (12,017)
MID |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 221,968 | 226,303 | 232,040
Segment operating expenses |  |  |  |  |  |  |  |  | 47,780 | 40,816 | 34,823
Segment operating income (loss) |  |  |  |  |  |  |  |  | 174,188 | 185,487 | 197,217
CRD |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 50,497 | 49,330 | 32,625
Segment operating expenses |  |  |  |  |  |  |  |  | 29,056 | 27,608 | 20,322
Segment operating income (loss) |  |  |  |  |  |  |  |  | 21,441 | 21,722 | 12,303
Other |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,813 | 20,925 | 6,836
Segment operating expenses |  |  |  |  |  |  |  |  | 32,147 | 34,106 | 42,306
Segment operating income (loss) |  |  |  |  |  |  |  |  | $ (8,334) | $ (13,181) | $ (35,470)

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