Long-Term Debt - Maturities Of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Less than one year	$ 38,538
One to two years	8,965
Two to three years	209,412
Three to four years	9,882
Gross debt	266,797	$ 270,913
Unamortized debt issuance costs	(5,829)
Total debt	260,968
Less: current maturities	(38,499)	(38,200)
Long-term debt	222,469	225,875
2023 Notes (mature September 2023)
Debt Instrument [Line Items]
Less than one year	30,000
Gross debt	30,000	30,000
Unamortized debt issuance costs	(39)
Total debt	29,961
Less: current maturities	(29,961)
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	(3,961)
Total debt	196,039
Long-term debt	196,039
MARAD Debt (matures February 2027)
Debt Instrument [Line Items]
Less than one year	8,538
One to two years	8,965
Two to three years	9,412
Three to four years	9,882
Gross debt	36,797	$ 40,913
Unamortized debt issuance costs	(1,829)
Total debt	34,968
Less: current maturities	(8,538)
Long-term debt	$ 26,430