Lease Accounting (Maturity of Lease Liabilities) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Leased Assets [Line Items]
2025	$ 46,207,000
2026	38,796,000
2027	34,826,000
2028	30,906,000
2029	28,752,000
Thereafter	233,802,000
Total Lease Payments	413,289,000
Less: Interest	(180,799,000)
Present value of operating lease liabilities	232,490,000	$ 244,815,000
Operating lease costs	32,900,000	41,400,000	$ 13,600,000
Lessor, Lease, Description [Line Items]
Operating lease costs	32,900,000	41,400,000	13,600,000
Marine transportation
Lessor, Lease, Description [Line Items]
Lease revenue	28,200,000	23,600,000	16,400,000
Expected undiscounted cash flows, year one	29,600,000
Expected undiscounted cash flows, year two	30,700,000
Expected undiscounted cash flows, year three	15,200,000
Lessee, Lease, Description [Line Items]
Lease revenue	28,200,000	$ 23,600,000	$ 16,400,000
Expected undiscounted cash flows, year two	30,700,000
Transportation equipment
Operating Leased Assets [Line Items]
2025	26,677,000
2026	19,524,000
2027	15,788,000
2028	12,246,000
2029	10,214,000
Thereafter	84,470,000
Total Lease Payments	168,919,000
Less: Interest	(69,513,000)
Present value of operating lease liabilities	99,406,000
Office Space and Equipment
Operating Leased Assets [Line Items]
2025	3,205,000
2026	2,895,000
2027	2,603,000
2028	2,165,000
2029	2,029,000
Thereafter	7,764,000
Total Lease Payments	20,661,000
Less: Interest	(5,054,000)
Present value of operating lease liabilities	15,607,000
Facilities and Equipment
Operating Leased Assets [Line Items]
2025	16,325,000
2026	16,377,000
2027	16,435,000
2028	16,495,000
2029	16,509,000
Thereafter	141,568,000
Total Lease Payments	223,709,000
Less: Interest	(106,232,000)
Present value of operating lease liabilities	$ 117,477,000