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Segments and Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial information of business segments                      
Revenue $ 73,422 $ 73,294 $ 57,919 $ 66,866 $ 57,443 $ 57,530 $ 56,215 $ 62,863 $ 271,501 $ 234,051 $ 312,363
Gain from settlement                 535 0 6,200
Other adjustment from revenue to CLI                 9,554 12,665 (750)
Customer licensing income                 281,590 246,716 317,813
Segment operating expenses                 106,118 98,400 84,072
Segment operating income (loss)                 175,472 148,316 233,741
Operating income (loss) 6,214 9,065 5,744 1,441 (4,027) (47,100) (21,749) (17,558) 22,464 (90,434) (1,536)
Interest and other income (expense), net                 (34,481) (27,451) (24,265)
Income (Loss) before income taxes                 (12,017) (117,885) (25,801)
MID
                      
Financial information of business segments                      
Revenue                 232,040 215,047 292,074
Gain from settlement                 535 0 6,200
Other adjustment from revenue to CLI                 5,000 7,500 (3,000)
Customer licensing income                 237,575 222,547 295,274
Segment operating expenses                 33,764 37,353 45,670
Segment operating income (loss)                 203,811 185,194 249,604
CRI
                      
Financial information of business segments                      
Revenue                 32,625 17,808 17,353
Gain from settlement                 0 0 0
Other adjustment from revenue to CLI                 2,304 5,165 2,250
Customer licensing income                 34,929 22,973 19,603
Segment operating expenses                 24,149 13,611 5,606
Segment operating income (loss)                 10,780 9,362 13,997
CTO
                      
Financial information of business segments                      
Revenue                 0 0 0
Gain from settlement                 0 0 0
Other adjustment from revenue to CLI                 0 0 0
Customer licensing income                 0 0 0
Segment operating expenses                 25,703 28,106 17,771
Segment operating income (loss)                 (25,703) (28,106) (17,771)
All Other
                      
Financial information of business segments                      
Revenue                 6,836 1,196 2,936
Gain from settlement                 0 0 0
Other adjustment from revenue to CLI                 2,250 0 0
Customer licensing income                 9,086 1,196 2,936
Segment operating expenses                 22,502 19,330 15,025
Segment operating income (loss)                 (13,416) (18,134) (12,089)
Reconciling items
                      
Financial information of business segments                      
Operating income (loss)                 $ (153,008) $ (238,750) $ (235,277)