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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Statement of Cash Flows [Abstract]    
Cash Flows from Operating Activities $ 507,260 $ 634,711
Property, plant and equipment:    
Capital expenditures (218,521) (335,586)
Change in accounts payable and accrued liabilities (5,555) 9,191
Proceeds from sale of property, plant and equipment 2,110 1,385
Contributions to equity method investments (24,265) (1,398)
Purchase of debt securities (2,959) 0
Oil & gas reserve asset acquisitions (3,485) (15,176)
Other 1,706 4,151
Net cash used in investing activities (250,969) (337,433)
Cash Flows from Financing Activities:    
Borrowings under securitization facility 74,000 75,000
Payments under securitization facility (74,000) (75,000)
Proceeds from equipment financings 0 54,626
Payments on equipment financings (9,552) (8,926)
Borrowings under revolving credit facilities 0 20,000
Payments under revolving credit facilities 0 (20,000)
Borrowing under long-term debt 0 400,000
Payments on long-term debt (10,547) (296,327)
Payment of debt issuance costs 0 (11,442)
Payments for tax withholdings related to settlements under deferred compensation plan (7,082) (15,544)
Distributions paid to Partners (259,406) (272,707)
Other (12,251) (11,342)
Net cash used in financing activities (298,838) (161,662)
Effect of exchange rate changes on cash and cash equivalents 66 0
Net Change in Cash and Cash Equivalents (42,481) 135,616
Cash and Cash Equivalents at Beginning of Period 136,962 59,813
Cash and Cash Equivalents at End of Period 94,481 195,429
Supplemental Cash Flow Information:    
Cash paid for interest 25,931 24,263
Cash paid for income taxes 16,294 16,509
Supplemental Non-Cash Activity:    
Accounts payable for purchase of property, plant and equipment 18,173 23,777
Right-of-use assets acquired by operating lease 3,730 716
Market value of common units issued under deferred compensation plans before tax withholding requirements $ 17,068 $ 34,880