Lease Accounting (Maturity of Lease Liabilities) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Leased Assets [Line Items]
2026	$ 10,676,000
2027	9,382,000
2028	8,951,000
2029	8,755,000
2030	7,953,000
Thereafter	108,347,000
Total Lease Payments	154,064,000
Less: Interest	(86,226,000)
Present value of operating lease liabilities	67,838,000	$ 75,389,000
Operating lease costs	16,700,000	15,400,000	$ 15,500,000
Lessor, Lease, Description [Line Items]
Operating lease costs	16,700,000	15,400,000	15,500,000
Marine transportation
Lessor, Lease, Description [Line Items]
Lease revenue	29,200,000	28,200,000	23,600,000
Expected undiscounted cash flows, year two	30,600,000
Expected undiscounted cash flows, year three	15,200,000
Lessee, Lease, Description [Line Items]
Lease revenue	29,200,000	$ 28,200,000	$ 23,600,000
Expected undiscounted cash flows, year two	30,600,000
Transportation equipment
Operating Leased Assets [Line Items]
2026	2,959,000
2027	1,737,000
2028	1,403,000
2029	1,390,000
2030	1,266,000
Thereafter	2,456,000
Total Lease Payments	11,211,000
Less: Interest	(2,269,000)
Present value of operating lease liabilities	8,942,000
Office Space and Equipment
Operating Leased Assets [Line Items]
2026	1,935,000
2027	1,849,000
2028	1,764,000
2029	1,585,000
2030	1,411,000
Thereafter	5,642,000
Total Lease Payments	14,186,000
Less: Interest	(3,483,000)
Present value of operating lease liabilities	10,703,000
Facilities and Equipment
Operating Leased Assets [Line Items]
2026	5,782,000
2027	5,796,000
2028	5,784,000
2029	5,780,000
2030	5,276,000
Thereafter	100,249,000
Total Lease Payments	128,667,000
Less: Interest	(80,474,000)
Present value of operating lease liabilities	$ 48,193,000