CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (4,549)	$ (10,334)	$ (211)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	49,895	56,280	56,751
Amortization and write-off of deferred debt issue costs	3,978	3,152	3,367
Amortization of discount on notes payable	2,200	0	0
Deferred income tax expense	4,186	5,744	2,432
(Gain) loss on disposition or sale of property, plant, and equipment	(1,373)	(5,669)	534
Gain on involuntary conversion of property, plant and equipment	0	0	(196)
Loss on extinguishment of debt	5,121	0	0
Derivative (income) loss	0	(901)	5,593
Net cash received (paid) for commodity derivatives	0	85	(4,984)
Unit-based compensation	163	161	384
Change in current assets and liabilities, excluding effects of acquisitions and dispositions:
Accounts and other receivables	26,348	4,579	(31,448)
Inventories	65,976	(47,678)	(8,334)
Due from affiliates	86	6,399	398
Other current assets	4,739	(1,479)	(3,552)
Trade and other accounts payable	(17,539)	486	14,331
Product exchange payables	394	(1,374)	1,033
Due to affiliates	(2,613)	7,123	1,389
Income taxes payable	(13)	280	(171)
Other accrued liabilities	2,880	(2,087)	(2,236)
Change in other non-current assets and liabilities	(2,411)	1,381	649
Net cash provided by operating activities	137,468	16,148	35,729
Cash flows from investing activities:
Payments for property, plant, and equipment	(34,317)	(27,237)	(16,059)
Payments for plant turnaround costs	(4,825)	(5,176)	(4,109)
Proceeds from sale of property, plant, and equipment	5,482	7,769	643
Proceeds from involuntary conversion of property, plant and equipment	0	0	284
Net cash used in investing activities	(33,660)	(24,644)	(19,241)
Cash flows from financing activities:
Payments of long-term debt	(632,197)	(393,740)	(333,790)
Payments under finance lease obligations	(9)	(279)	(2,707)
Proceeds from long-term debt	543,489	404,650	316,500
General partner contributions	0	0	3
Excess purchase price over carrying value of acquired assets	0	(1,285)	0
Purchase of treasury units	0	0	(17)
Payments of debt issuance costs	(14,289)	(64)	(592)
Cash distributions paid	(793)	(793)	(791)
Net cash provided by (used in) financing activities	(103,799)	8,489	(21,394)
Net increase (decrease) in cash	9	(7)	(4,906)
Cash at beginning of year	45	52	4,958
Cash at end of year	$ 54	$ 45	$ 52