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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Royalties $ 20,820 $ 24,230
Material sales 4,391 1,121
License fees, milestones and other revenues 30,946 3,916
Total revenues 56,157 29,267
Operating costs and expenses:    
Cost of sales [1] 788 341
Amortization of intangibles 3,278 2,715
Research and development 7,407 8,673
General and administrative 7,643 7,322
Total operating costs and expenses 19,116 19,051
Income from operations 37,041 10,216
Other (expense) income:    
Interest expense, net (2,605) (2,941)
Increase in contingent liabilities (960) (140)
Gain (loss) from Viking 21,097 (1,083)
Other income, net 739 141
Total other income (expense), net 18,271 (4,023)
Income before income taxes 55,312 6,193
Income tax expense (10,033) (1,114)
Net income $ 45,279 $ 5,079
Per share amounts:    
Basic net income per share (USD per share) $ 2.13 $ 0.24
Shares used in basic per share calculations (shares) 21,209,000 20,938,000
Diluted net income per share (USD per share) $ 1.83 $ 0.22
Shares used in diluted per share calculations (shares) 24,800,314 23,019,189
[1] Excludes amortization of intangibles.