Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Less than one year	$ 8,749
One to two years	9,186
Two to three years	209,644
Three to four years	5,001
Gross debt	232,580	$ 270,913
Unamortized debt issuance costs	(5,323)
Total debt	227,257
Less: current maturities	(8,749)	(38,200)
Long-term debt	218,508	225,875
2026 Notes (mature February 2026)
Debt Instrument [Line Items]
Two to three years	200,000
Gross debt	200,000	200,000
Unamortized debt issuance costs	(3,616)
Total debt	196,384
Long-term debt	196,384
MARAD Debt (matures February 2027)
Debt Instrument [Line Items]
Less than one year	8,749
One to two years	9,186
Two to three years	9,644
Three to four years	5,001
Gross debt	32,580	$ 40,913
Unamortized debt issuance costs	(1,707)
Total debt	30,873
Less: current maturities	(8,749)
Long-term debt	$ 22,124