Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income (loss)	$ 42,609	$ 14,470	$ (11,322)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	86,412	84,325	78,456
Bad debt expense	3,000	1,191	3,302
Equity in (earnings) losses of affiliates, net of dividends	(10,494)	14,766	(677)
Gain on sale of assets	(14,401)	(667)	(20,802)
Gains on sales of Rail Group assets and related leases	(10,990)	(11,019)	(13,281)
Deferred income taxes	(63,234)	6,030	27,279
Stock based compensation expense	6,097	6,987	1,899
Pension settlement charge, net of cash contributed	0	0	48,344
Goodwill impairment	59,081	0	56,166
Asset impairment	10,913	9,107	285
Other	(55)	(2,070)	(1,439)
Changes in operating assets and liabilities:
Accounts receivable	9,781	(26,429)	45,058
Inventories	16,141	28,165	73,350
Commodity derivatives	20,285	(9,990)	14,098
Other assets	(5,623)	19,407	(26,315)
Accounts payable and accrued expenses	(74,237)	(94,688)	(120,267)
Net cash provided by (used in) operating activities	75,285	39,585	154,134
Investing Activities
Acquisition of businesses, net of cash acquired	(3,507)	0	(128,549)
Purchases of Rail Group assets	(143,020)	(85,268)	(115,032)
Proceeds from sale of Rail Group assets	36,896	56,689	76,625
Purchases of property, plant and equipment and capitalized software	(34,602)	(77,740)	(72,469)
Proceeds from sale of assets	33,879	69,904	284
Proceeds from returns of investments in affiliates	1,069	9,186	1,620
Purchase of investments	(5,679)	(2,523)	(938)
Other	1,470	1,534	(21)
Net cash provided by (used in) investing activities	(113,494)	(28,218)	(238,480)
Financing Activities
Net change in short-term borrowings	(8,059)	14,000	15,000
Proceeds from issuance of long-term debt	85,175	81,760	181,767
Payments of long-term debt	(57,189)	(97,606)	(92,474)
Proceeds from long-term financing arrangements	12,195	14,027	0
Distributions to noncontrolling interest owner	(377)	(5,853)	(3,206)
Payments of debt issuance costs	(2,024)	(323)	(296)
Purchases of treasury stock	0	0	(49,089)
Dividends paid	(18,152)	(17,362)	(15,921)
Other	(1,071)	(1,130)	(2,389)
Net cash provided by (used in) financing activities	10,498	(12,487)	33,392
Increase (decrease) in cash and cash equivalents	(27,711)	(1,120)	(50,954)
Cash and cash equivalents at beginning of year	62,630	63,750	114,704
Cash and cash equivalents at end of year	$ 34,919	$ 62,630	$ 63,750