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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS      
CASH FLOWS FROM OPERATING ACTIVITIES $ 54,647 $ 78,719  
Property, plant and equipment:      
Capital expenditures (31,437) (50,364)  
Change in accounts payable and accrued liabilities 7,200 (3,612)  
Proceeds from sale of property, plant and equipment 1,139 2,500  
Distributions received from investments in excess of cumulative earnings 361 142  
Net cash used in investing activities (22,737) (51,334)  
CASH FLOWS FROM FINANCING ACTIVITIES:      
Borrowings under securitization facility   12,800  
Payments under securitization facility (17,800) (28,200)  
Payments on equipment financings (4,239) (3,225)  
Borrowings under revolving credit facilities 10,000 70,000  
Payments under revolving credit facilities (42,500) (25,000)  
Borrowings from line of credit 1,830    
Payments on finance lease obligations (185) (1,510)  
Payment of debt issuance costs (6) (5,758)  
Payments for taxes related to net settlement of issuance of units in deferred compensation plans   (1,310)  
Distributions paid to Partners   (51,753) $ (51,753)
Other (141) (288)  
Net cash used in financing activities (53,041) (34,244)  
NET CHANGE IN CASH AND CASH EQUIVALENTS (21,131) (6,859)  
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 55,574 36,482 36,482
CASH AND CASH EQUIVALENTS AT END OF PERIOD 34,443 29,623 $ 55,574
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest 2,094 4,533  
SUPPLEMENTAL NON-CASH ACTIVITY:      
Accounts payable for purchase of property, plant and equipment $ 12,931 10,892  
Right-of-use assets acquired by operating lease   195  
Market value of common units issued under deferred compensation plans before tax withholding requirements   $ 3,837