Debt (Long-term debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Less: current maturities	$ 27,561	$ 110,155
Less: unamortized prepaid debt issuance costs	3,111	3,003
Long-term Debt	562,960	492,518
Recourse
Debt Instrument [Line Items]
Long-term debt, gross	593,632	605,676
Debt instrument, collateral amount	$ 50,700
Recourse | Note payable, variable rate (7.08% at December 31, 2023), payable in increasing amounts plus interest, due 2029
Debt Instrument [Line Items]
Interest rate of debt instruments	7.08%
Long-term debt, gross	$ 191,055	201,524
Recourse | Note payable, variable rate (6.95% at December 31, 2023), payable in increasing amounts plus interest, due 2027
Debt Instrument [Line Items]
Interest rate of debt instruments	6.95%
Long-term debt, gross	$ 128,320	135,352
Recourse | Note payable, variable rate (7.03% at December 31, 2023), payable in increasing amounts plus interest, due 2031
Debt Instrument [Line Items]
Interest rate of debt instruments	7.03%
Long-term debt, gross	$ 97,500	0
Recourse | Note payable, 4.50%, payable at maturity, due 2034
Debt Instrument [Line Items]
Interest rate of debt instruments	4.50%
Long-term debt, gross	$ 91,744	95,500
Recourse | Note payable, 4.85%, payable at maturity, due 2026
Debt Instrument [Line Items]
Interest rate of debt instruments	4.85%
Long-term debt, gross	$ 25,000	25,000
Recourse | Industrial revenue bond, variable rate (5.22% at December 31, 2023), payable at maturity, due 2036
Debt Instrument [Line Items]
Interest rate of debt instruments	5.22%
Long-term debt, gross	$ 21,000	21,000
Recourse | Note payable, 4.50%, payable at maturity, due 2030
Debt Instrument [Line Items]
Interest rate of debt instruments	4.50%
Long-term debt, gross	$ 16,000	16,000
Recourse | Note payable, 5.00%, payable at maturity, due 2040
Debt Instrument [Line Items]
Interest rate of debt instruments	5.00%
Long-term debt, gross	$ 14,000	14,000
Recourse | Finance lease obligations, due serially to 2043
Debt Instrument [Line Items]
Long-term debt, gross	9,013	9,965
Recourse | Note payable, variable rate, payable at maturity, due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	63,335
Recourse | Note payable, 4.55%, payable at maturity, due 2023
Debt Instrument [Line Items]
Interest rate of debt instruments	4.55%
Long-term debt, gross	$ 0	$ 24,000