Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income (loss)	$ 19,431	$ (29,752)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	45,232	42,878
Bad debt expense (recovery)	(837)	839
Equity in (earnings) losses of affiliates, net of dividends	(11,192)	(3,793)
Gains on sale of Rail Group assets and related leases	(3,989)	(4,984)
(Gain) loss on sale of assets	(342)	(5,888)
Stock-based compensation expense	3,006	2,935
Goodwill impairment	0	42,000
Asset impairment	6,272	0
Other	(138)	(1,780)
Changes in operating assets and liabilities:
Accounts receivable	(33,859)	13,086
Inventories	151,095	213,064
Commodity derivatives	34,850	27,670
Other assets	17,552	10,629
Payables and other accrued expenses	(271,010)	(352,133)
Net cash provided by (used in) operating activities	(43,929)	(45,229)
Investing Activities
Acquisition of business, net of cash acquired	0	(3,507)
Purchases of Rail Group assets	(68,087)	(66,506)
Proceeds from sale of Rail Group assets	40,967	9,390
Purchases of property, plant and equipment and capitalized software	(54,300)	(15,976)
Proceeds from sale of assets	34,981	14,434
Purchase of investments	0	(2,429)
Other	0	437
Net cash provided by (used in) investing activities	(46,439)	(64,157)
Financing Activities
Net change in short-term borrowings	163,000	93,941
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	(110,150)	(42,849)
Proceeds from noncontrolling interest owner	21,806	0
Proceeds from sale of treasury shares to employees and directors	0	0
Payments of debt issuance costs	(787)	(2,024)
Dividends paid	(9,312)	(8,984)
Other	(497)	35
Net cash provided by (used in) financing activities	114,060	65,690
Decrease in cash and cash equivalents	23,692	(43,696)
Cash and cash equivalents at beginning of period	34,919	62,630
Cash and cash equivalents at end of period	$ 58,611	$ 18,934