Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income (loss)	$ (11,322)	$ 122,645	$ 95,702
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	78,456	62,005	55,307
Bad debt expense	3,302	1,183	1,187
Equity in earnings of affiliates, net of dividends	(677)	28,749	(50,953)
Gain on sale of investments in affiliates	(22,881)	(17,055)	0
Gains on sales of Rail Group assets and related leases	(13,281)	(15,830)	(19,366)
Loss on sales of property, plant and equipment	2,079	2,079	633
Excess tax benefit from share-based payment arrangement	(1,299)	(1,806)	(1,001)
Deferred income taxes	27,279	21,815	40,374
Stock based compensation expense	1,899	8,581	4,339
Pension settlement charge	48,344	0	0
Goodwill impairment charge	56,166	0	0
Asset impairment charge	285	3,090	4,439
Other	(140)	(296)	(135)
Changes in operating assets and liabilities:
Accounts receivable	45,058	(1,703)	35,446
Inventories	73,350	(172,040)	162,443
Commodity derivatives	14,098	(27,652)	69,633
Other assets	(26,315)	(11,407)	(4,926)
Accounts payable and accrued expenses	(120,267)	(12,429)	(55,934)
Net cash (used in) provided by operating activities	154,134	(10,071)	337,188
Investing Activities
Acquisition of businesses, net of cash acquired	(128,549)	(20,037)	(15,252)
Purchases of Rail Group assets	(115,032)	(90,067)	(92,584)
Proceeds from sale of Rail Group assets	76,625	32,099	97,232
Purchases of property, plant and equipment	(72,469)	(59,675)	(46,786)
Proceeds from sale of property, plant and equipment	284	1,401	390
Proceeds from returns of investments in affiliates	1,620	46,800	0
Investments in affiliates	(938)	(238)	(49,251)
Change in restricted cash	(21)	(21)	(10)
Net cash used in investing activities	(238,480)	(89,738)	(106,261)
Financing Activities
Net change in short-term borrowings	15,000	0	(24,219)
Proceeds from issuance of long-term debt	181,767	3,405	68,003
Payments of long-term debt	(92,474)	(69,697)	(94,752)
Distributions to noncontrolling interest owner	(3,206)	(14,920)	0
Proceeds from sale of treasury shares to employees and directors	468	1,509	1,939
Payments of debt issuance costs	(296)	(3,175)	(46)
Purchase of treasury stock	(49,089)	0	0
Dividends paid	(15,921)	(12,485)	(11,986)
Excess tax benefit from share-based payment arrangement	1,299	1,806	1,001
Other	(4,156)	(1,015)	0
Net cash (used in) provided by financing activities	33,392	(94,572)	(60,060)
(Decrease) increase in cash and cash equivalents	(50,954)	(194,381)	170,867
Cash and cash equivalents at beginning of year	114,704	309,085	138,218
Cash and cash equivalents at end of year	$ 63,750	$ 114,704	$ 309,085