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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue:      
Royalties $ 262,415 $ 271,521 $ 264,111
Contract and other revenue 33,863 25,037 7,390
Total revenue 296,278 296,558 271,501
Operating costs and expenses:      
Cost of revenue [1] 45,344 41,947 33,215
Research and development [1] 111,110 110,025 117,981
Sales, general and administrative [1] 70,554 74,770 76,467
Restructuring costs 3,576 39 5,546
Impairment of goodwill and long-lived assets 0 0 17,751
Gain from sale of intellectual property (3,686) (3,529) (1,388)
Gain from settlement (2,040) (2,040) (535)
Costs and Expenses 224,858 221,212 249,037
Operating income (loss) 71,420 75,346 22,464
Interest Income (Expense), Nonoperating, Net 1,224 (276) (1,596)
Interest income and other income (expense), net (11,189) (25,096) (34,481)
Interest expense (12,413) (24,820) (32,885)
Income before income taxes 60,231 50,250 (12,017)
Provision for (benefit from) income taxes (151,157) 24,049 21,731
Net income (loss) $ 211,388 $ 26,201 $ (33,748)
Net income per share:      
Basic (in dollars per share) $ 1.84 $ 0.23 $ (0.30)
Diluted (in dollars per share) $ 1.80 $ 0.22 $ (0.30)
Weighted average shares used in per share calculations:      
Basic (in shares) 114,814 114,318 112,415
Diluted (in shares) 117,484 117,624 112,415
[1] * Includes stock-based compensation: Cost of revenue$63 $44 $19Research and development$6,762 $7,216 $6,597Sales, general and administrative$8,271 $7,470 $8,365