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Exchangeable Senior Notes - Equity and Liability Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2015
Debt Instrument [Line Items]      
Principal amount of liability component $ 569,513 $ 562,374  
2015 Notes      
Debt Instrument [Line Items]      
Principal amount of liability component 575,000    
Unamortized debt issuance costs     $ (11,992)
Senior Notes | 2015 Notes      
Debt Instrument [Line Items]      
Carrying amount of equity component 22,597 22,597  
Principal amount of liability component 575,000 575,000  
Unamortized discount - equity component (3,675) (8,417)  
Unamortized debt issuance costs (1,812) (4,209)  
Net carrying amount of liability component $ 569,513 $ 562,374