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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)