Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ 13,262	$ (51,111)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	47,504	46,898
Bad debt (recovery) expense, net	(1,686)	4,310
Equity in earnings of affiliates, net of dividends	(1,794)	(129)
Gain on sales of Rail assets and related leases, net	(2,635)	(645)
Stock-based compensation expense	1,990	2,880
Deferred federal income tax	(2)	16,474
Inventory write down	2,479	10,571
Other	2,100	4,001
Changes in operating assets and liabilities:
Accounts receivable	(33,476)	(11,737)
Inventories	5,007	122,323
Commodity derivatives	(53,295)	1,231
Other assets	16,740	(10,887)
Payables and other accrued expenses	(441,921)	(362,609)
Net cash used in operating activities	(445,727)	(228,430)
Investing Activities
Purchases of Rail assets	(2,611)	(13,270)
Proceeds from sale of Rail assets	5,383	2,405
Purchases of property, plant and equipment and capitalized software	(16,919)	(19,307)
Proceeds from sale of assets	385	36
Purchase of investments	(2,800)	(280)
Other	832	0
Net cash used in investing activities	(15,730)	(30,416)
Financing Activities
Net change in short-term borrowings	510,160	251,712
Proceeds from issuance of long-term debt	89,700	90,736
Payments of long-term debt	(125,884)	(104,913)
Contributions from noncontrolling interest owner	1,960	3,307
Distributions to noncontrolling interest owner	0	(10,298)
Payments of debt issuance costs	(1,225)	(250)
Dividends paid	(5,839)	(5,723)
Other	(1,110)	(994)
Net cash provided by financing activities	467,762	223,577
Effect of exchange rates on cash and cash equivalents	(35)	67
Increase (decrease) in cash and cash equivalents	6,270	(35,202)
Cash and cash equivalents at beginning of period	29,123	54,895
Cash and cash equivalents at end of period	$ 35,393	$ 19,693