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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue:        
Royalties $ 66,823 $ 64,009 $ 196,173 $ 207,387
Contract and other revenue 6,956 5,703 23,332 17,131
Total revenue 73,779 69,712 219,505 224,518
Operating costs and expenses:        
Cost of revenue [1] 11,111 10,540 34,004 31,199
Research and development [1] 27,784 27,014 85,506 81,580
Sales, general and administrative [1] 17,860 18,200 53,701 55,639
Gain from sale of intellectual property (106) 0 (3,262) (170)
Restructuring charges 0 0 0 39
Gain from settlement (510) (510) (1,530) (1,530)
Total operating costs and expenses 56,139 55,244 168,419 166,757
Operating income (loss) 17,640 14,468 51,086 57,761
Interest income and other income (expense), net 539 (549) 874 (432)
Interest expense (3,117) (3,059) (9,291) (21,755)
Interest and other income (expense), net (2,578) (3,608) (8,417) (22,187)
Income before income taxes 15,062 10,860 42,669 35,574
Provision for (benefit from) income taxes (166,971) 5,347 (155,727) 17,214
Net Income (Loss) $ 182,033 $ 5,513 $ 198,396 $ 18,360
Net income per share:        
Earnings Per Share, Basic $ 1.56 $ 0.05 $ 1.71 $ 0.16
Earnings Per Share, Diluted $ 1.52 $ 0.05 $ 1.67 $ 0.16
Weighted average shares used in per share calculation:        
Basic (in shares) 116,444 114,523 115,940 114,080
Diluted (in shares) 119,542 118,206 118,997 117,540
[1] Includes stock-based compensation