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Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Financial information of business segments |  |
Revenues | $ 66,866 | $ 62,863
Other patent royalties received | 5,237 | 2,414
Customer licensing income | 72,103 | 65,277
Segment operating expenses | 26,857 | 26,125
Segment operating income (loss) | 45,246 | 39,152
Operating income (loss) | 1,441 | (17,558)
Interest and other income (expense), net | (7,332) | (6,482)
Loss before income taxes | (5,891) | (24,040)
MID Segment |  |
Financial information of business segments |  |
Revenues | 59,674 | 57,088
Other patent royalties received | 1,875 | 0
Customer licensing income | 61,549 | 57,088
Segment operating expenses | 8,924 | 11,550
Segment operating income (loss) | 52,625 | 45,538
CTO Segment |  |
Financial information of business segments |  |
Revenues | 0 | 0
Other patent royalties received | 0 | 0
Customer licensing income | 0 | 0
Segment operating expenses | 7,858 | 6,503
Segment operating income (loss) | (7,858) | (6,503)
All Other |  |
Financial information of business segments |  |
Revenues | 7,192 | 5,775
Other patent royalties received | 3,362 | 2,414
Customer licensing income | 10,554 | 8,189
Segment operating expenses | 10,075 | 8,072
Segment operating income (loss) | 479 | 117
Reconciling Items |  |
Financial information of business segments |  |
Operating income (loss) | $ (43,805) | $ (56,710)

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