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CONSOLIDATED AND CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net income (loss) $ 18,084 $ (4,101)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 29,286 28,917
Amortization of deferred debt issuance costs 1,568 1,521
Deferred income tax expense 2,304 758
(Gain) loss on sale of property, plant and equipment, net (260) 671
Derivative (income) loss (734) 884
Net cash paid for commodity derivatives 85 (679)
Non cash unit-based compensation 79 288
Change in current assets and liabilities, excluding effects of acquisitions and dispositions:    
Accounts and other receivables 10,714 (2,303)
Inventories (55,725) (17,572)
Due from affiliates (2,149) (5,812)
Other current assets (17,741) 1,435
Trade and other accounts payable 37,688 3,335
Product exchange payables (869) 327
Due to affiliates 7,940 1,504
Income taxes payable 368 (248)
Other accrued liabilities (2,332) (3,053)
Change in other non-current assets and liabilities 145 213
Net cash provided by operating activities 28,451 6,085
Cash flows from investing activities:    
Payments for property, plant and equipment (14,634) (8,200)
Payments for plant turnaround costs (1,600) (1,694)
Proceeds from sale of property, plant and equipment 689 133
Net cash used in investing activities (15,545) (9,761)
Cash flows from financing activities:    
Payments of long-term debt (217,589) (144,790)
Payments under finance lease obligations (119) (2,591)
Proceeds from long-term debt 206,500 147,500
Purchase of treasury units 0 (17)
Payment of debt issuance costs (26) (307)
Excess purchase price over carrying value of acquired assets (1,285) 0
Cash distributions paid (396) (396)
Net cash used in financing activities (12,915) (601)
Net increase (decrease) in cash (9) (4,277)
Cash at beginning of period 52 4,958
Cash at end of period 43 681
Non-cash additions to property, plant and equipment $ 1,705 $ 686