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Debt - October 2026 notes Interest expense and carrying value (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Components of carrying value        
Principal amount of debt $ 1,370,500,000 $ 1,370,500,000   $ 1,430,700,000
Unamortized debt issuance cost (10,861,000) (10,861,000)   (15,718,000)
Carrying value 1,359,639,000 1,359,639,000   1,414,982,000
Components of interest expense        
Borrowing interest expense 3,952,000      
Amortization of debt issuance cost   3,010,000 $ 3,992,000  
Accretion of original issue discount 176,000 (3,747,000) $ (4,190,000)  
Total interest and debt financing expenses 4,272,000      
October 2026 Notes        
Components of carrying value        
Principal amount of debt 300,000 300,000   300,000
Unamortized debt issuance cost (2,949) (2,949)   (3,495)
Original issue discount, net of accretion (2,584) (2,584)   (3,063)
Carrying value 294,467 294,467   $ 293,442
Components of interest expense        
Borrowing interest expense 1,913 5,738    
Amortization of debt issuance cost 184 546    
Accretion of original issue discount 162 479    
Total interest and debt financing expenses $ 2,259 $ 6,763