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Debt, Net - Debt and Equity Components and Issuance Costs of Convertible Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Mar. 31, 2017
Mar. 31, 2014
Jul. 31, 2013
Debt Instrument [Line Items]          
Equity component $ 76,351 $ 76,351      
2020 Convertible Notes | Convertible Notes          
Debt Instrument [Line Items]          
Debt component 140,247        
Equity component 32,253        
Equity issuance cost $ 1,106        
Stated interest rate (as a percent) 3.00%       3.00%
Effective interest rate (as a percent) 6.35%        
2021 Convertible Notes | Convertible Notes          
Debt Instrument [Line Items]          
Debt component $ 143,645        
Equity component 17,355        
Equity issuance cost $ 581        
Stated interest rate (as a percent) 2.875%     2.875%  
Effective interest rate (as a percent) 4.70%        
2022 Convertible Notes | Convertible Notes          
Debt Instrument [Line Items]          
Debt component $ 137,266        
Equity component 12,734        
Equity issuance cost $ 398        
Stated interest rate (as a percent) 3.25%   3.25%    
Effective interest rate (as a percent) 5.20%        
2023 Exchangeable Notes | Convertible Notes          
Debt Instrument [Line Items]          
Debt component $ 157,971        
Equity component 14,009        
Equity issuance cost $ 0        
Stated interest rate (as a percent) 4.50%        
Effective interest rate (as a percent) 6.50%