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Debt Obligations, Convertible Senior Unsecured Notes (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2016
Jan. 31, 2020
$ / shares
Dec. 31, 2018
Jul. 20, 2018
Jul. 03, 2018
Debt Obligations                      
Cash paid for the exchange of convertible notes       $ 22,145,000 $ 3,037,000            
Loss on extinguishment of debt   $ (1,592,000)   (3,546,000) (128,000)            
Total   4,877,079,000   4,877,079,000              
Convertible Senior Unsecured Notes                      
Debt Obligations                      
Principal amount   278,490,000   $ 278,490,000   $ 300,914,000          
Proceeds received, net of estimated issuance costs           34,000,000.0          
Loss on extinguishment of debt           7,300,000          
Inducement charge           $ 1,100,000          
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed             100.00%        
Maturity period (in years)       2 years 3 months 7 days   2 years 8 months 1 day          
Unamortized Debt Discount   7,242,000   $ 7,242,000   $ 9,235,000          
Unamortized Deferred Financing Fees   6,004,000   6,004,000   7,527,000          
Total   265,244,000   265,244,000   284,152,000          
Net Carrying Value, Equity Component       9,962,000   $ 9,962,000          
Interest expense   4,800,000 $ 4,900,000 10,000,000.0 10,200,000            
Interest expense related to cash coupon   3,300,000 3,400,000 6,700,000 6,900,000            
Debt discount   800,000 800,000 1,700,000 1,700,000            
Deferred fees expensed as interest expense   $ 700,000 $ 700,000 $ 1,600,000 $ 1,500,000            
Cost of the notes (as a percent)   6.75%   6.75%   6.80%          
5.375% Convertible Notes                      
Debt Obligations                      
Interest rate (as a percent)   5.375%   5.375%         5.375%    
Conversion rate of the notes to common stock, per $1,000 principal amount of notes 90.093                    
6.50% Convertible Notes                      
Debt Obligations                      
Proceeds from issued debt       $ 200,000              
Interest rate (as a percent)                 6.50%    
5.25% Convertible Notes                      
Debt Obligations                      
Interest rate (as a percent)   5.25%   5.25%   5.25%     5.25% 5.25% 5.25%
Cash paid for the exchange of convertible notes       $ 233,100,000   $ 228,700,000          
Common stock exchanged (in shares) | shares       4,478,315              
4.75% Convertible Notes                      
Debt Obligations                      
Principal amount   $ 1,000   $ 1,000   $ 264,000,000.0          
Interest rate (as a percent)   4.75%   4.75%   4.75%          
Proceeds received, net of estimated issuance costs           $ 256,500,000          
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       56.1695              
Conversion price per share of common stock | $ / shares   $ 17.80   $ 17.80              
4.75% Convertible Notes | First Offering                      
Debt Obligations                      
Principal amount           $ 1,000          
Conversion rate of the notes to common stock, per $1,000 principal amount of notes           56.1695          
Conversion price per share of common stock | $ / shares           $ 17.80          
Junior subordinated notes                      
Debt Obligations                      
Principal amount   $ 154,336,000   $ 154,336,000   $ 154,336,000          
Deferred fees expensed as interest expense       1,900,000   $ 2,000,000.0          
Issued on July 3, 2018 | 5.375% Convertible Notes | First Offering                      
Debt Obligations                      
Principal amount   $ 1,000   $ 1,000              
Conversion price per share of common stock | $ / shares   $ 11.50   $ 11.50              
Issued on July 3, 2018 | 6.50% Convertible Notes | First Offering                      
Debt Obligations                      
Conversion price per share of common stock | $ / shares   $ 9.28   $ 9.28              
Issued on July 3, 2018 | 5.25% Convertible Notes                      
Debt Obligations                      
Principal amount   $ 500,000   $ 500,000              
Issued on July 3, 2018 | 5.25% Convertible Notes | First Offering                      
Debt Obligations                      
Conversion price per share of common stock | $ / shares   $ 12.85   $ 12.85              
Issued on July 20, 2018 | 5.375% Convertible Notes | First Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       86.9943              
Issued on July 20, 2018 | 5.375% Convertible Notes | Second Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       80.6055              
Conversion price per share of common stock | $ / shares   11.10   $ 11.10              
Issued on July 20, 2018 | 6.50% Convertible Notes | First Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       107.7122              
Issued on July 20, 2018 | 6.50% Convertible Notes | Second Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       116.9744              
Conversion price per share of common stock | $ / shares   $ 8.55   $ 8.55              
Issued on July 20, 2018 | 5.25% Convertible Notes                      
Debt Obligations                      
Principal amount   $ 13,800,000   $ 13,800,000              
Issued on July 20, 2018 | 5.25% Convertible Notes | First Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       77.8331              
Issued on July 20, 2018 | 5.25% Convertible Notes | Second Offering                      
Debt Obligations                      
Principal amount   $ 1,000   $ 1,000              
Conversion rate of the notes to common stock, per $1,000 principal amount of notes       90.093              
Conversion price per share of common stock | $ / shares               $ 12.41