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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.