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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS      
CASH FLOWS FROM OPERATING ACTIVITIES $ 310,977 $ 291,788  
Property, plant and equipment:      
Capital expenditures (88,661) (102,820)  
Change in accounts payable and accrued liabilities 2,281 (9,698)  
Proceeds from sale of property, plant and equipment 6,432 2,750  
Distributions received from investments in excess of cumulative earnings 1,088 841  
Escrow deposit for oil & gas reserve acquisition (1,550)    
Net cash used in investing activities (80,410) (108,927)  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under securitization facility 35,000 46,100  
Payments under securitization facility (90,900) (47,700)  
Proceeds from equipment financings   14,705  
Payments on equipment financings (12,888) (10,622)  
Borrowings under revolving credit facilities 15,000 70,000  
Payments under revolving credit facilities (102,500) (190,000)  
Borrowings from line of credit 3,230    
Payments on finance lease obligations (568) (8,204)  
Payment of debt issuance costs (113) (5,821)  
Payments for purchase of units and tax withholdings related to settlements under deferred compensation plans (1,090) (1,310)  
Distributions paid to Partners (26,086) (51,753) $ (51,753)
Other (615) (603)  
Net cash used in financing activities (181,530) (185,208)  
NET CHANGE IN CASH AND CASH EQUIVALENTS 49,037 (2,347)  
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 55,574 36,482 36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD 104,611 34,135 $ 55,574
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest 20,045 26,686  
Cash paid for income taxes 11 10  
SUPPLEMENTAL NON-CASH ACTIVITY:      
Accounts payable for purchase of property, plant and equipment 8,012 4,806  
Right-of-use assets acquired by operating lease   278  
Market value of common units issued under deferred compensation plans before tax withholding requirements $ 1,082 $ 3,837