Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income (loss)	$ (29,752)	$ (181)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	42,878	41,379
Bad debt expense	839	491
Equity in (earnings) losses of affiliates, net of dividends	(3,793)	7,181
Gains on sale of facilities and investments in affiliates	(4,701)	(685)
Gains on sale of Rail Group assets and related leases	(4,984)	(4,725)
Deferred income taxes	(628)	(1,601)
Stock-based compensation expense	2,935	3,696
Goodwill impairment	42,000	0
Other	(2,339)	234
Changes in operating assets and liabilities:
Accounts receivable	13,086	(43,650)
Inventories	213,064	224,368
Commodity derivatives	27,670	(60,443)
Other assets	10,629	35,612
Payables and other accrued expenses	(352,133)	(396,037)
Net cash provided by (used in) operating activities	(45,229)	(194,361)
Investing Activities
Acquisition of business, net of cash acquired	(3,507)	0
Purchases of Rail Group assets	(66,506)	(27,504)
Proceeds from sale of Rail Group assets	9,390	10,397
Purchases of property, plant and equipment and capitalized software	(15,976)	(34,443)
Proceeds from sale of property, plant and equipment	646	173
Proceeds from returns of investments in affiliates	0	15,013
Proceeds from sale of facilities and investments	13,788	54,330
Purchase of investments	(2,429)	(2,523)
Other	437	(538)
Net cash provided by (used in) investing activities	(64,157)	14,905
Financing Activities
Net change in short-term borrowings	93,941	164,000
Proceeds from issuance of long-term debt	15,175	77,564
Proceeds from long-term financing arrangement	10,396	0
Payments of long-term debt	(42,849)	(85,177)
Proceeds from sale of treasury shares to employees and directors	473	1,282
Payments of debt issuance costs	(2,024)	(309)
Dividends paid	(8,984)	(8,679)
Other	(438)	(1,592)
Net cash provided by (used in) financing activities	65,690	147,089
Decrease in cash and cash equivalents	(43,696)	(32,367)
Cash and cash equivalents at beginning of period	62,630	63,750
Cash and cash equivalents at end of period	$ 18,934	$ 31,383