Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income (loss)	$ (14,148)	$ (1,982)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	33,760	22,679
Bad debt expense (recovery)	318	(531)
Equity in (earnings) losses of affiliates, net of dividends	(1,465)	(2,360)
Gains on sale of Rail Group assets and related leases	(736)	(2,280)
Loss (gain) on sale of assets	143	277
Stock-based compensation expense	4,799	1,268
Deferred federal income tax	(5,640)	0
Other	4,385	(70)
Changes in operating assets and liabilities:
Accounts receivable	(79,295)	(30,730)
Inventories	124,741	(85,262)
Commodity derivatives	(9,149)	(45,775)
Other assets	11,337	1,134
Payables and other accrued expenses	(191,095)	(235,075)
Net cash provided by (used in) operating activities	(122,045)	(378,707)
Investing Activities
Acquisition of business, net of cash acquired	(147,343)	0
Purchases of Rail Group assets	(15,873)	(29,516)
Proceeds from sale of Rail Group assets	1,948	14,575
Purchases of property, plant and equipment and capitalized software	(44,728)	(29,414)
Proceeds from sale of assets	400	6
Purchase of investments	(240)	0
Net cash provided by (used in) investing activities	(205,836)	(44,349)
Financing Activities
Net change in short-term borrowings	9,942	467,000
Proceeds from issuance of long-term debt	693,761	50,000
Payments of long-term debt	(361,067)	(106,515)
Proceeds from noncontrolling interest owner	4,715	14,700
Payments of debt issuance costs	(5,788)	(787)
Dividends paid	(5,515)	(4,650)
Other	2	(114)
Net cash provided by (used in) financing activities	336,050	419,634
Effect of exchange rates on cash and cash equivalents	(771)	0
Increase (Decrease) in cash and cash equivalents	7,398	(3,422)
Cash and cash equivalents at beginning of period	22,593	34,919
Cash and cash equivalents at end of period	$ 29,991	$ 31,497