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Segments and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2011
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 57,443 | [1] | $ 57,530 | [1] | $ 56,215 | $ 62,863 | $ 83,359 | $ 100,263 | $ 66,214 | $ 62,527 | $ 234,051 | $ 312,363 | $ 323,390 |
Gain from settlement |  |  |  |  |  |  |  |  |  |  | 0 | 6,200 | 126,800 | 133,000
Other patent royalties received |  |  |  |  |  |  |  |  |  |  | 12,665 | (750) | 0 |
Customer licensing income |  |  |  |  |  |  |  |  |  |  | 246,716 | 317,813 | 450,190 |
Segment operating expenses |  |  |  |  |  |  |  |  |  |  | 98,400 | 84,072 | 68,565 |
Segment operating income (loss) |  |  |  |  |  |  |  |  |  |  | 148,316 | 233,741 | 381,625 |
Operating income (loss) | (4,027) | [1] | (47,100) | [1] | (21,749) | (17,558) | (18,134) | 10,736 | (2,508) | 8,370 | (90,434) | (1,536) | 226,882 |
Interest and other expense, net |  |  |  |  |  |  |  |  |  |  | (27,451) | (24,265) | (18,838) |
Income (Loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (117,885) | (25,801) | 208,044 |
MID |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 215,047 | 292,074 | 323,038 |
Gain from settlement |  |  |  |  |  |  |  |  |  |  | 0 | 6,200 | 126,800 |
Other patent royalties received |  |  |  |  |  |  |  |  |  |  | 7,500 | (3,000) | 0 |
Customer licensing income |  |  |  |  |  |  |  |  |  |  | 222,547 | 295,274 | 449,838 |
Segment operating expenses |  |  |  |  |  |  |  |  |  |  | 37,353 | 45,670 | 45,174 |
Segment operating income (loss) |  |  |  |  |  |  |  |  |  |  | 185,194 | 249,604 | 404,664 |
CTO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Gain from settlement |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other patent royalties received |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Customer licensing income |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Segment operating expenses |  |  |  |  |  |  |  |  |  |  | 28,106 | 17,771 | 15,392 |
Segment operating income (loss) |  |  |  |  |  |  |  |  |  |  | (28,106) | (17,771) | (15,392) |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 19,004 | 20,289 | 352 |
Gain from settlement |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other patent royalties received |  |  |  |  |  |  |  |  |  |  | 5,165 | 2,250 | 0 |
Customer licensing income |  |  |  |  |  |  |  |  |  |  | 24,169 | 22,539 | 352 |
Segment operating expenses |  |  |  |  |  |  |  |  |  |  | 32,941 | 20,631 | 7,999 |
Segment operating income (loss) |  |  |  |  |  |  |  |  |  |  | (8,772) | 1,908 | (7,647) |
Reconciling items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial information of business segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | $ (238,750) | $ (235,277) | $ (154,743) |
[1] | The quarterly financial information includes $6.6 million related to restructuring charges in the quarter ended September 30, 2012 and$0.7 million related to restructuring charges in the quarter ended December 31, 2012. Refer to Note 16, "Restructuring Charges" of Notes to Consolidated Financial Statements of this Form 10-K.

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