Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net income (loss)	$ 15,263	$ 19,431
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	64,146	45,232
Bad debt expense (recovery)	1,703	(837)
Equity in (earnings) losses of affiliates, net of dividends	(1,034)	(11,192)
Gains on sales of Rail Group assets and related leases	(1,298)	(3,989)
Loss (gain) on sales of assets	106	(342)
Stock-based compensation expense	7,292	3,006
Deferred federal income tax	5,793	0
Asset impairment	3,081	6,272
Other	1,102	(138)
Changes in operating assets and liabilities:
Accounts receivable	(181,917)	(33,859)
Inventories	394,630	151,095
Commodity derivatives	(82,933)	34,850
Other assets	27,420	17,552
Payables and other accrued expenses	(338,201)	(271,010)
Net cash provided by (used in) operating activities	(84,847)	(43,929)
Investing Activities
Acquisition of business, net of cash acquired	(147,693)	0
Purchases of Rail Group assets	(43,435)	(68,087)
Proceeds from sale of Rail Group assets	7,389	40,967
Purchases of property, plant and equipment and capitalized software	(87,209)	(54,300)
Proceeds from sale of assets	795	34,981
Purchase of investments	(1,240)	0
Net cash provided by (used in) investing activities	(271,393)	(46,439)
Financing Activities
Net change in short-term borrowings	(660)	163,000
Proceeds from issuance of long-term debt	748,099	50,000
Payments of long-term debt	(390,528)	(110,150)
Proceeds from noncontrolling interest owner	4,715	21,806
Payments of debt issuance costs	(5,788)	(787)
Dividends paid	(11,041)	(9,312)
Other	(387)	(497)
Net cash provided by (used in) financing activities	344,410	114,060
Effect of exchange rates on cash and cash equivalents	324	0
Increase (Decrease) in cash and cash equivalents	(11,506)	23,692
Cash and cash equivalents at beginning of period	22,593	34,919
Cash and cash equivalents at end of period	$ 11,087	$ 58,611