Lease Accounting (Lease Balances by Major Categories) (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Operating Leased Assets [Line Items]
Total Right of use assets, net	$ 228,186,000	$ 240,341,000
Accrued liabilities, current	27,558,000	29,869,000
Other long-term liabilities, non-current	204,932,000	214,946,000
Present value of operating lease liabilities	$ 232,490,000	$ 244,815,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities	Accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER LONG-TERM LIABILITIES	OTHER LONG-TERM LIABILITIES
Marine transportation
Operating Leased Assets [Line Items]
Expected undiscounted cash flows, year three	$ 15,200,000
Transportation equipment
Operating Leased Assets [Line Items]
Total Right of use assets, net	105,181,000	$ 115,689,000
Present value of operating lease liabilities	99,406,000
Office Space and Equipment
Operating Leased Assets [Line Items]
Total Right of use assets, net	8,925,000	9,014,000
Present value of operating lease liabilities	15,607,000
Facilities and Equipment
Operating Leased Assets [Line Items]
Total Right of use assets, net	114,080,000	$ 115,638,000
Present value of operating lease liabilities	$ 117,477,000