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Fair Value Measurements - Estimated fair values and the carrying values (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value Measurements    
Carrying Value $ 406,708 $ 404,171
2026 Convertible Senior Notes    
Fair Value Measurements    
Carrying Value 392,621 390,523
Fair Value 290,132 331,783
2025 Convertible Senior Notes    
Fair Value Measurements    
Carrying Value 14,087 13,648
Fair Value $ 12,373 $ 13,628