Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income (loss)	$ 41,225,000	$ 42,609,000	$ 14,470,000
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization	90,297,000	86,412,000	84,325,000
Bad debt expense	542,000	3,000,000	1,191,000
Equity in (earnings) losses of affiliates, net of dividends	(23,167,000)	(10,494,000)	14,766,000
Gain on sale of assets	(5,218,000)	(14,401,000)	(667,000)
Gains on sales of Rail Group assets and related leases	(9,558,000)	(10,990,000)	(11,019,000)
Deferred income taxes	11,018,000	(63,234,000)	6,030,000
Stock based compensation expense	6,624,000	6,097,000	6,987,000
Goodwill impairment	0	59,081,000	0
Asset impairment	6,272,000	10,913,000	9,107,000
Other	(1,451,000)	(55,000)	(2,070,000)
Changes in operating assets and liabilities:
Accounts receivable	(24,788,000)	9,781,000	(26,429,000)
Inventories	(44,060,000)	16,141,000	28,165,000
Commodity derivatives	(16,610,000)	20,285,000	(9,990,000)
Accounts payable and accrued expenses	(69,935,000)	(74,237,000)	(94,688,000)
Other assets	3,290,000	(5,623,000)	19,407,000
Net cash provided by (used in) operating activities	(35,519,000)	75,285,000	39,585,000
Investing Activities
Acquisition of businesses, net of cash acquired	(2,248,000)	(3,507,000)	0
Purchases of Rail Group assets	(167,005,000)	(143,020,000)	(85,268,000)
Proceeds from sale of Rail Group assets	79,439,000	36,896,000	56,689,000
Purchases of property, plant and equipment and capitalized software	(142,579,000)	(34,602,000)	(77,740,000)
Proceeds from sale of assets and businesses	47,486,000	33,879,000	69,904,000
Proceeds from returns of investments in affiliates	0	1,069,000	9,186,000
Purchase of investments	(1,086,000)	(5,679,000)	(2,523,000)
Other	0	1,470,000	1,534,000
Net cash provided by (used in) investing activities	(185,993,000)	(113,494,000)	(28,218,000)
Financing Activities
Net change in short-term borrowings	183,000,000	(8,059,000)	14,000,000
Proceeds from issuance of long-term debt	132,000,000	85,175,000	81,760,000
Payments of long-term debt	(121,090,000)	(57,189,000)	(97,606,000)
Proceeds from long-term financing arrangements	0	12,195,000	14,027,000
Proceeds from (distributions to) noncontrolling interest owner	46,736,000	(377,000)	(5,853,000)
Payments of debt issuance costs	(1,446,000)	(2,024,000)	(323,000)
Payments to acquire noncontrolling interest	(10,000,000)	0	0
Dividends paid	(18,639,000)	(18,152,000)	(17,362,000)
Other	(1,375,000)	(1,071,000)	(1,130,000)
Net cash provided by (used in) financing activities	209,186,000	10,498,000	(12,487,000)
Increase (decrease) in cash and cash equivalents	(12,326,000)	(27,711,000)	(1,120,000)
Cash and cash equivalents at beginning of year	34,919,000	62,630,000	63,750,000
Cash and cash equivalents at end of year	$ 22,593,000	$ 34,919,000	$ 62,630,000