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Debt - Interest expense recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 21, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument          
Contractual interest expense   $ (12,438) $ (251) $ (12,915) $ (502)
Senior Notes | Convertible Senior Notes Due 2026          
Debt Instrument          
Contractual interest expense   (375)   (458)  
Amortization of debt discount and debt issuance costs   (428)   (523)  
Total   (803)   (981)  
Revolving Credit Facility          
Debt Instrument          
Amortization of debt discount and debt issuance costs   (1,340)   (1,489)  
Total   (7,910)   (8,209)  
Revolving Credit Facility | Bridge Loan          
Debt Instrument          
Unsecured bridge loan facility commitment fee $ (6,400) (6,407)   (6,407)  
Revolving Credit Facility | Senior Unsecured Revolving Credit Facility          
Debt Instrument          
Contractual interest expense   (534)   (534)  
Revolving Credit Facility | 2021 Credit Agreement          
Debt Instrument          
Amortization of debt discount and debt issuance costs   (531)   (531)  
Total   (3,725)   (3,725)  
Revolving Credit Facility | Term Loan          
Debt Instrument          
Contractual interest expense   (2,660)   (2,660)  
Revolving Credit Facility | 2019 Credit Agreement          
Debt Instrument          
Contractual interest expense   $ (163)   $ (313)