Debt (Long-term debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Less: current maturities	$ 36,139	$ 27,561
Less: unamortized prepaid debt issuance costs	2,552	3,111
Long-term Debt	608,151	562,960
Recourse
Debt Instrument [Line Items]
Long-term debt, gross	646,842	593,632
Debt instrument, collateral amount	$ 48,800
Recourse | Note payable, variable rate (6.01% at December 31, 2024), payable in increasing amounts plus interest, due 2029
Debt Instrument [Line Items]
Interest rate of debt instruments	6.01%
Long-term debt, gross	$ 180,586	191,055
Recourse | Note payable, variable rate (5.88% at December 31, 2024), payable in increasing amounts plus interest, due 2027
Debt Instrument [Line Items]
Interest rate of debt instruments	5.88%
Long-term debt, gross	$ 121,289	128,320
Recourse | Note payable, variable rate (6.01% at December 31, 2024), payable in increasing amounts plus interest, due 2031
Debt Instrument [Line Items]
Interest rate of debt instruments	6.01%
Long-term debt, gross	$ 92,500	97,500
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	$ 87,818	91,744
Recourse | Note payable, variable rate 7.74% Due 2029
Debt Instrument [Line Items]
Interest rate of debt instruments	7.56%
Long-term debt, gross	$ 67,000	0
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 (4.97% at December 31, 2024), payable at maturity, due 2036
Debt Instrument [Line Items]
Interest rate of debt instruments	4.97%
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 | Note payable, 3.85%, payable at maturity, due 2029
Debt Instrument [Line Items]
Interest rate of debt instruments	3.85%
Long-term debt, gross	$ 4,500	0
Recourse | Note payable, 4.80%, payable at maturity, due 2026
Debt Instrument [Line Items]
Interest rate of debt instruments	4.80%
Long-term debt, gross	$ 1,499	0
Recourse | Note payable, 4.11%, payable at maturity, due 2026
Debt Instrument [Line Items]
Interest rate of debt instruments	4.11%
Long-term debt, gross	$ 1,378	0
Recourse | Note payable, 5.80%, payable at maturity, due 2028
Debt Instrument [Line Items]
Interest rate of debt instruments	5.80%
Long-term debt, gross	$ 1,088	0
Recourse | Note payable, 5.60%, payable at maturity, due 2025
Debt Instrument [Line Items]
Interest rate of debt instruments	5.60%
Long-term debt, gross	$ 600	0
Recourse | Note payable, 4.13%, payable at maturity, due 2026
Debt Instrument [Line Items]
Interest rate of debt instruments	4.13%
Long-term debt, gross	$ 553	0
Recourse | Note payable, 4.05%, payable at maturity, due 2026
Debt Instrument [Line Items]
Interest rate of debt instruments	4.05%
Long-term debt, gross	$ 439	0
Recourse | Note payable, 5.40%, payable at maturity, due 2025
Debt Instrument [Line Items]
Interest rate of debt instruments	5.40%
Long-term debt, gross	$ 93	0
Recourse | Finance lease obligations, due serially to 2043
Debt Instrument [Line Items]
Long-term debt, gross	7,880	9,013
Recourse | Finance lease obligations, due serially to 2049
Debt Instrument [Line Items]
Long-term debt, gross	3,619	$ 0
Non-recourse
Debt Instrument [Line Items]
Debt instrument, collateral amount	$ 133,200