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Long Term Debt (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 07, 2020
USD ($)
$ / shares
Apr. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]            
Settlement of convertible debt       $ 289,331 $ 0  
Accrued interest payable     $ 41,336 41,336   $ 63,600
Convertible Debt | Convertible Senior Notes due 2023            
Debt Instrument [Line Items]            
Principal balance   $ 374,000        
Stated interest rate (as a percent)   7.00%        
Proceeds from issuance of debt   $ 362,000        
Conversion rate ratio   0.1538        
Conversion price (in dollars per share) | $ / shares   $ 6.50        
Settlement of convertible debt     299,000      
Outstanding amount of debt     74,000 74,000    
Accrued interest payable     1,000 1,000    
Unamortized debt issuance cost     2,000 2,000    
Interest expense     4,000      
Debt instrument, amount covered by offering   $ 250,000        
Fair value of Capped Call Transactions     $ 45,000 $ 45,000    
Common Stock            
Debt Instrument [Line Items]            
Debt conversion, shares converted into (in shares) | shares     46      
Debt instrument, initial strike price (in dollars per share) | $ / shares $ 6.50          
Debt instrument, strike price cap (in dollars per share) | $ / shares $ 8.45          
Premium above sale price of common stock (as a percent) 30.00%          
Payments for cost of Capped Call Transactions $ 33,750