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Debt - March 2026 notes Interest expense and carrying value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of carrying value      
Principal amount of debt $ 1,263,500 $ 1,395,500  
Unamortized debt issuance cost (7,567) (10,197)  
Carrying value 1,255,933 [1] 1,385,303  
Components of interest expense      
Amortization of debt issuance cost 3,570 3,896 $ 5,731
Accretion of original issue discount (5,329) (4,934) (5,674)
March 2026 Notes      
Components of carrying value      
Principal amount of debt 300,000 300,000 300,000
Unamortized debt issuance cost (1,421) (2,069) (2,719)
Original issue discount, net of accretion (1,057) (1,539) (2,021)
Carrying value 297,522 [1] 296,392 295,260
Components of interest expense      
Borrowing interest expense 8,850 8,850 7,154
Amortization of debt issuance cost 648 649 525
Accretion of original issue discount 482 482 391
Total interest and debt financing expenses $ 9,980 $ 9,981 $ 8,070
[1] Carrying value represents aggregate principal amount outstanding less unamortized debt issuance costs.