Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Income (loss) before income taxes from continuing operations	$ 131,542	$ (16,171)	$ 3,876
Income from discontinued operations, net of income taxes	4,324	1,956	11,184
Net income (loss)	135,866	(14,215)	15,060
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	178,934	188,638	146,166
Bad debt expense, net	237	7,042	4,007
Equity in (earnings) losses of affiliates, net of dividends	(4,842)	(638)	7,671
Gain on sales of assets, net	(6,184)	(686)	(5,483)
Stock-based compensation expense	11,038	10,183	16,229
Deferred federal income tax	(104,618)	26,386	5,114
Inventory write down	3,399	11,676	0
Gain on sale of business from continuing operations	(14,619)	0	(5,702)
Loss on sale of business from discontinued operations	1,491	0	0
Asset impairment	8,947	0	41,212
Gain from remeasurement of equity method investments, net	0	0	(35,214)
Other	7,146	10,072	3,540
Changes in operating assets and liabilities:
Accounts receivable	(184,002)	(128,502)	1,487
Inventories	(528,073)	(139,499)	(1,578)
Commodity derivatives	(107,188)	(115,170)	21,714
Other current and non-current assets	(116,403)	(53,208)	30,497
Payables and other current and non-current liabilities	667,821	123,489	103,842
Net cash (used in) provided by operating activities	(51,050)	(74,432)	348,562
Investing Activities
Acquisition of businesses, net of cash acquired	(11,425)	0	(102,580)
Purchases of property, plant and equipment and capitalized software	(75,766)	(77,147)	(165,223)
Proceeds from sale of assets	4,508	11,112	5,446
Purchase of investments	(6,243)	(3,059)	(1,490)
Proceeds from sale of business from continuing operations	18,130	0	25,171
Proceeds from sale of business from discontinued operations	543,102	0	0
Purchases of Rail assets	(6,039)	(27,739)	(105,254)
Proceeds from sale of Rail assets	19,150	10,077	18,090
Other	1,831	0	808
Net cash provided by (used in) investing activities	487,248	(86,756)	(325,032)
Financing Activities
Net receipts (payments) under short-term lines of credit	(105,895)	254,971	(278,824)
Proceeds from issuance of short-term debt	608,250	0	0
Payments of short-term debt	(408,250)	0	0
Proceeds from issuance of long-term debt	203,000	471,906	922,594
Payments of long-term debt	(530,733)	(559,711)	(608,483)
Contributions from noncontrolling interest owner	4,655	8,576	4,714
Distributions to noncontrolling interest owner	(25)	(10,322)	0
Payments of debt issuance costs	(2,692)	(898)	(6,561)
Dividends paid	(23,746)	(23,004)	(22,118)
Proceeds from exercises of stock options	6,667	0	0
Other	0	(5,222)	(2,615)
Net cash (used in) provided by financing activities	(248,769)	136,296	8,707
Effect of exchange rates on cash, cash equivalents and restricted cash	(108)	(880)	65
Increase (decrease) in cash, cash equivalents and restricted cash	187,321	(25,772)	32,302
Cash, cash equivalents and restricted cash at beginning of year	29,123	54,895	22,593
Cash, cash equivalents and restricted cash at end of year	$ 216,444	$ 29,123	$ 54,895