Fair Value Measurements - Principal Amount And Estimated Fair Value Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 01, 2023
Fair Value Measurements
Principal Amount	$ 323,831	$ 372,779
Fair Value	345,869	412,452
2026 Notes (fully redeemed March 2024)
Fair Value Measurements
Principal Amount		40,199
Fair Value		64,117
MARAD Debt (matures February 2027)
Fair Value Measurements
Principal Amount	23,831	32,580
Fair Value	23,819	32,348
2029 Notes (mature March 2029)
Fair Value Measurements
Principal Amount	300,000	300,000	$ 300,000
Fair Value	$ 322,050	$ 315,987