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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS      
CASH FLOWS FROM OPERATING ACTIVITIES $ 158,216 $ 170,168  
Property, plant and equipment:      
Capital expenditures (55,626) (84,245)  
Change in accounts payable and accrued liabilities 1,547 (6,508)  
Proceeds from sale of property, plant and equipment 2,838 2,739  
Distributions received from investments in excess of cumulative earnings 994 551  
Net cash used in investing activities (50,247) (87,463)  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under securitization facility 35,000 12,800  
Payments under securitization facility (52,800) (47,700)  
Proceeds from equipment financings   14,705  
Payments on equipment financings (8,535) (6,494)  
Borrowings under revolving credit facilities 15,000 70,000  
Payments under revolving credit facilities (102,500) (60,000)  
Borrowings from line of credit 1,830    
Payments on finance lease obligations (375) (8,043)  
Payment of debt issuance costs (6) (5,776)  
Payments for taxes related to net settlement of issuance of units in deferred compensation plans   (1,310)  
Distributions paid to Partners (13,045) (51,753) $ (51,753)
Other (363) (510)  
Net cash used in financing activities (125,794) (84,081)  
NET CHANGE IN CASH AND CASH EQUIVALENTS (17,825) (1,376)  
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 55,574 36,482 36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD 37,749 35,106 $ 55,574
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest 18,817 23,337  
Cash paid for income taxes 11 4  
SUPPLEMENTAL NON-CASH ACTIVITY:      
Accounts payable for purchase of property, plant and equipment $ 7,278 7,996  
Right-of-use assets acquired by operating lease   278  
Market value of common units issued under deferred compensation plans before tax withholding requirements   $ 3,837