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Fair Value Measurements - Estimated fair values and the carrying values (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value Measurements    
Carrying Value $ 378,553 $ 406,708
2026 Convertible Senior Notes    
Fair Value Measurements    
Carrying Value 364,362 392,621
Fair Value 306,355 290,132
2025 Convertible Senior Notes    
Fair Value Measurements    
Carrying Value 14,191 14,087
Fair Value $ 13,495 $ 12,373