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Debt Obligations, Convertible Senior Unsecured Notes (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2021
USD ($)
shares
Jul. 20, 2018
Apr. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Mar. 31, 2021
Jul. 03, 2018
Debt Obligations                      
Cash paid for the exchange of convertible notes             $ 22,145,000        
Loss on extinguishment of debt         $ (1,592,000) $ (1,370,000) (3,546,000)        
Total       $ 6,805,878,000   6,805,878,000          
Convertible Senior Unsecured Notes                      
Debt Obligations                      
Junior subordinated notes       278,300,000   $ 278,300,000   $ 278,300,000      
Proceeds received, net of estimated issuance costs                 $ 34,000,000.0    
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed           100.00%          
Maturity period (in years)           1 year 3 months 7 days   1 year 9 months 7 days      
Unamortized Debt Discount       4,031,000   $ 4,031,000   $ 5,636,000      
Unamortized Deferred Financing Fees       3,352,000   3,352,000   4,691,000      
Total       270,917,000   270,917,000   267,973,000      
Net Carrying Value, Equity Component           9,962,000   $ 9,962,000      
Interest expense       4,800,000   9,600,000 10,000,000.0        
Interest expense related to cash coupon       3,300,000   6,600,000 6,700,000        
Debt discount       800,000   1,600,000 1,700,000        
Deferred fees expensed as interest expense       700,000   1,400,000 1,600,000        
Cost of the notes (as a percent)               6.75%   6.75%  
8.00% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes       $ 70,750,000   $ 70,750,000   $ 70,750,000      
Interest rate (as a percent)       8.00%   8.00%   8.00%      
4.50% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes       $ 275,000,000   $ 275,000,000   $ 275,000,000      
Interest rate (as a percent)       4.50%   4.50%   4.50%      
5.25% Convertible Notes                      
Debt Obligations                      
Interest rate (as a percent)   5.25%             5.25%   5.25%
Cash paid for the exchange of convertible notes $ 14,300,000         $ 233,100,000     $ 228,700,000    
Common stock exchanged (in shares) | shares 386,459         4,478,315          
4.75% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes       $ 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           56.5332          
Conversion price per share of common stock | $ / shares       $ 17.69   $ 17.69          
4.75% Convertible Notes | First Offering                      
Debt Obligations                      
Junior subordinated notes                 $ 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    
5.75% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes       $ 90,000,000   $ 90,000,000   $ 90,000,000      
Interest rate (as a percent)       5.75%   5.75%   5.75%      
5.00% Convertible Notes                      
Debt Obligations                      
Proceeds from issued debt     $ 172,300,000                
Junior subordinated notes                      
Debt Obligations                      
Junior subordinated notes       $ 154,336,000   $ 154,336,000   $ 154,336,000      
Deferred fees expensed as interest expense           1,800,000   $ 1,800,000      
Issued on July 3, 2018 | 5.25% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes       500,000   500,000          
Issued on July 3, 2018 | 5.25% Convertible Notes | First Offering                      
Debt Obligations                      
Junior subordinated notes       $ 1,000   $ 1,000          
Conversion rate of the notes to common stock, per $1,000 principal amount of notes   91.9605                  
Conversion price per share of common stock | $ / shares       $ 10.87   $ 10.87          
Issued on July 20, 2018 | 5.25% Convertible Notes                      
Debt Obligations                      
Junior subordinated notes         $ 13,800,000   $ 13,800,000        
Issued on July 20, 2018 | 5.25% Convertible Notes | Second Offering                      
Debt Obligations                      
Conversion rate of the notes to common stock, per $1,000 principal amount of notes           82.2763          
Conversion price per share of common stock | $ / shares       $ 12.15   $ 12.15