Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income (loss)	$ (1,982)	$ (3,035)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	22,679	21,003
Bad debt expense (recovery)	(531)	629
Equity in (earnings) losses of affiliates, net of dividends	(2,360)	1,931
Gains on sale of Rail Group assets and related leases	(2,280)	(3,609)
(Gain) loss on sale of assets	277	(4,698)
Stock-based compensation expense	1,268	1,220
Other	(70)	(725)
Changes in operating assets and liabilities:
Accounts receivable	(30,730)	7,563
Inventories	(85,262)	33,456
Commodity derivatives	(45,775)	4,017
Other assets	1,134	(9,375)
Payables and other accrued expenses	(235,075)	(277,612)
Net cash provided by (used in) operating activities	(378,707)	(229,235)
Investing Activities
Purchases of Rail Group assets	(29,516)	(25,074)
Proceeds from sale of Rail Group assets	14,575	5,621
Purchases of property, plant and equipment and capitalized software	(29,414)	(5,608)
Proceeds from sale of assets	6	13,912
Purchase of investments	0	(1,817)
Other	0	(281)
Net cash provided by (used in) investing activities	(44,349)	(13,247)
Financing Activities
Net change in short-term borrowings	467,000	226,000
Proceeds from issuance of long-term debt	50,000	15,175
Proceeds from long-term financing arrangement	0	10,396
Payments of long-term debt	(106,515)	(37,852)
Proceeds from noncontrolling interest owner	14,700	0
Proceeds from sale of treasury shares to employees and directors	0	511
Payments of debt issuance costs	(787)	(33)
Dividends paid	(4,650)	(4,483)
Other	(114)	(217)
Net cash provided by (used in) financing activities	419,634	209,497
Decrease in cash and cash equivalents	(3,422)	(32,985)
Cash and cash equivalents at beginning of period	34,919	62,630
Cash and cash equivalents at end of period	$ 31,497	$ 29,645