Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income (loss)	$ (14,215)	$ 15,060	$ 41,225
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	188,638	146,166	90,297
Bad debt expense	7,042	4,007	542
Equity in (earnings) losses of affiliates, net of dividends	(638)	7,671	(23,167)
Loss (gain) on sales of assets, net	(37)	(7,063)	(5,218)
Gains on sales of Rail assets and related leases, net	(649)	(4,122)	(9,558)
Stock based compensation expense	10,183	16,229	6,624
Deferred income tax	26,386	5,114	11,018
Inventory write-down	11,676	0	0
Asset impairment	0	41,212	6,272
Gain from remeasurement of equity method investments, net	0	(35,214)	0
Other	10,072	3,540	(1,451)
Changes in operating assets and liabilities:
Accounts receivable	(128,502)	1,487	(24,788)
Inventories	(139,499)	(1,578)	(44,060)
Commodity derivatives	(115,170)	21,714	(16,610)
Other assets	(53,208)	30,497	3,290
Payables and other accrued expenses	123,489	103,842	(69,935)
Net cash provided by (used in) operating activities	(74,432)	348,562	(35,519)
Investing Activities
Acquisition of businesses, net of cash acquired	0	(102,580)	(2,248)
Purchases of Rail assets	(27,739)	(105,254)	(167,005)
Proceeds from sale of Rail assets	10,077	18,090	79,439
Purchases of property, plant and equipment and capitalized software	(77,147)	(165,223)	(142,579)
Proceeds from sale of assets and businesses	11,112	30,617	47,486
Purchase of investments	(3,059)	(1,490)	(1,086)
Other	0	808	0
Net cash used in investing activities	(86,756)	(325,032)	(185,993)
Financing Activities
Net change in short-term borrowings	254,971	(278,824)	183,000
Proceeds from issuance of long-term debt	471,906	922,594	132,000
Payments of long-term debt	(559,711)	(608,483)	(121,090)
Proceeds from noncontrolling interest owner	8,576	4,714	46,736
Distributions to noncontrolling interest owner	(10,322)	0	0
Payments of debt issuance costs	(898)	(6,561)	(1,446)
Acquisition of noncontrolling interest	0	0	(10,000)
Dividends paid	(23,004)	(22,118)	(18,639)
Other	(5,222)	(2,615)	(1,375)
Net cash provided by financing activities	136,296	8,707	209,186
Effect of exchange rates on cash, cash equivalents and restricted cash	(880)	65	0
Increase (decrease) in cash, cash equivalents and restricted cash	(25,772)	32,302	(12,326)
Cash, cash equivalents and restricted cash at beginning of year	54,895	22,593	34,919
Cash, cash equivalents and restricted cash at end of year	$ 29,123	$ 54,895	$ 22,593