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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities $ 227,447 $ 58,088
Deferred consideration payable 18,800 18,300
Contingent consideration payable 336,200 310,240
Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 227,447 58,088
Equity Securities, FV-NI 4,129  
Stock appreciation rights liability 1,960 3,814
Deferred consideration payable 38,200 37,700
Contingent consideration payable 277,400 257,040
Contingent consideration payable- net sales milestones and royalties 58,800 53,200
Recurring basis | Quoted prices in active markets for identical assets (level 1)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0 0
Equity Securities, FV-NI 4,129  
Stock appreciation rights liability 0 0
Deferred consideration payable 0 0
Contingent consideration payable 0 0
Contingent consideration payable- net sales milestones and royalties 0 0
Recurring basis | Significant other observable inputs (level 2)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 227,447 58,088
Stock appreciation rights liability 0 0
Deferred consideration payable 38,200 37,700
Contingent consideration payable 0 0
Contingent consideration payable- net sales milestones and royalties 0 0
Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0 0
Stock appreciation rights liability 1,960 3,814
Deferred consideration payable 0 0
Contingent consideration payable 277,400 257,040
Agilis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable- net sales milestones and royalties $ 58,800 $ 53,200