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Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Financial information of business segments |  |  |  |
Revenues | $ 73,294 | $ 57,530 | $ 198,079 | $ 176,608
Other patent royalties received | 1,029 | 4,875 | 9,658 | 8,490
Customer licensing income | 74,323 | 62,405 | 207,737 | 185,098
Segment operating expenses | 25,735 | 21,195 | 81,228 | 73,345
Segment operating income (loss) | 48,588 | 41,210 | 126,509 | 111,753
Operating income (loss) | 9,065 | (47,100) | 16,250 | (86,407)
Interest and other income (expense), net | (8,486) | (7,133) | (24,663) | (20,245)
Loss before income taxes | 579 | (54,233) | (8,413) | (106,652)
MID Segment |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 66,103 | 54,044 | 175,233 | 163,269
Other patent royalties received | 179 | 3,750 | 5,179 | 3,750
Customer licensing income | 66,282 | 57,794 | 180,412 | 167,019
Segment operating expenses | 7,730 | 7,147 | 26,001 | 28,741
Segment operating income (loss) | 58,552 | 50,647 | 154,411 | 138,278
CTO Segment |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 0 | 0 | 0 | 0
Other patent royalties received | 0 | 0 | 0 | 0
Customer licensing income | 0 | 0 | 0 | 0
Segment operating expenses | 6,530 | 6,801 | 21,462 | 21,169
Segment operating income (loss) | (6,530) | (6,801) | (21,462) | (21,169)
All Other |  |  |  |
Financial information of business segments |  |  |  |
Revenues | 7,191 | 3,486 | 22,846 | 13,339
Other patent royalties received | 850 | 1,125 | 4,479 | 4,740
Customer licensing income | 8,041 | 4,611 | 27,325 | 18,079
Segment operating expenses | 11,475 | 7,247 | 33,765 | 23,435
Segment operating income (loss) | (3,434) | (2,636) | (6,440) | (5,356)
Reconciling Items |  |  |  |
Financial information of business segments |  |  |  |
Operating income (loss) | $ (39,523) | $ (88,310) | $ (110,259) | $ (198,160)

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