Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income (loss)	$ 14,470	$ (11,322)	$ 122,645
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	84,325	78,456	62,005
Bad debt expense	1,191	3,302	1,183
Equity in earnings of affiliates, net of dividends	14,766	(677)	28,749
Gain on sale of investments in affiliates	(685)	(22,881)	(17,055)
Gains on sales of Rail Group assets and related leases	(11,019)	(13,281)	(15,830)
Loss on sales of property, plant and equipment	18	2,079	2,079
Excess tax benefit from share-based payment arrangement	13	(1,299)	(1,806)
Deferred income taxes	6,030	27,279	21,815
Stock based compensation expense	6,987	1,899	8,581
Pension settlement charge, net of cash contributed	0	48,344	0
Goodwill impairment charge	0	56,166	0
Asset impairment	9,107	285	3,090
Other	(2,083)	(140)	(296)
Changes in operating assets and liabilities:
Accounts receivable	(26,429)	45,058	(1,703)
Inventories	28,165	73,350	(172,040)
Commodity derivatives	(9,990)	14,098	(27,652)
Other assets	19,407	(26,315)	(11,407)
Accounts payable and accrued expenses	(94,688)	(120,267)	(12,429)
Net cash provided by (used in) operating activities	39,585	154,134	(10,071)
Investing Activities
Acquisition of businesses, net of cash acquired	0	(128,549)	(20,037)
Purchases of Rail Group assets	(85,268)	(115,032)	(90,067)
Proceeds from sale of Rail Group assets	56,689	76,625	32,099
Purchases of property, plant and equipment	(77,740)	(72,469)	(59,675)
Proceeds from sale of property, plant and equipment	561	284	1,401
Proceeds from returns of investments in affiliates	9,186	1,620	46,800
Proceeds from sale of investments	15,013	0	0
Proceeds from sale of facilities	54,330	0	0
Purchase of investments	(2,523)	(938)	(238)
Other	1,534	(21)	(21)
Net cash provided by (used in) investing activities	(28,218)	(238,480)	(89,738)
Financing Activities
Net change in short-term borrowings	14,000	15,000	0
Proceeds from issuance of long-term debt	81,760	181,767	3,405
Payments of long-term debt	(97,606)	(92,474)	(69,697)
Proceeds from financing agreements	14,027	0	0
Distributions to noncontrolling interest owner	(5,853)	(3,206)	(14,920)
Proceeds from sale of treasury shares to employees and directors	1,027	468	1,509
Payments of debt issuance costs	(323)	(296)	(3,175)
Purchase of treasury stock	0	(49,089)	0
Dividends paid	(17,362)	(15,921)	(12,485)
Excess tax benefit from share-based payment arrangement	(13)	1,299	1,806
Other	(2,144)	(4,156)	(1,015)
Net cash provided by (used in) financing activities	(12,487)	33,392	(94,572)
(Decrease) increase in cash and cash equivalents	(1,120)	(50,954)	(194,381)
Cash and cash equivalents at beginning of year	63,750	114,704	309,085
Cash and cash equivalents at end of year	$ 62,630	$ 63,750	$ 114,704