Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities
Net income	$ 36,344	$ 75,399
Adjustments to reconcile net income to cash used in operating activities:
Depreciation and amortization	36,596	28,434
Bad debt expense	484	310
Cash distributions in excess of (less than) income of unconsolidated affiliates	(1,980)	13,214
Gain on sale of investments in affiliates	0	(17,055)
Gains on sales of Rail Group assets and related leases	(9,213)	(13,284)
Excess tax benefit from share-based payment arrangement	(1,299)	(1,645)
Deferred income taxes	10,736	7,202
Stock-based compensation expense	1,988	6,053
Other	833	(2,368)
Changes in operating assets and liabilities:
Accounts receivable	(42,209)	(17,130)
Inventories	312,341	181,927
Commodity derivatives	27,835	(68,196)
Other assets	17,173	22,400
Trade and other payables	(449,027)	(474,846)
Net cash used in operating activities	(59,398)	(259,585)
Investing Activities
Acquisition of business, net of cash acquired	(124,328)	0
Purchases of Rail Group assets	(53,756)	(30,403)
Proceeds from sale of Rail Group assets	26,355	29,195
Purchases of property, plant and equipment	(28,214)	(20,633)
Proceeds from sale of property, plant and equipment	453	283
Proceeds from returns of investments in affiliates	1,866	31,457
Other	0	(138)
Change in restricted cash	(513)	(488)
Net cash (used in) provided by investing activities	(178,137)	9,273
Financing Activities
Net change in short-term borrowings	138,000	27,000
Proceeds from issuance of long-term debt	151,608	6,712
Payments of long-term debt	(82,014)	(39,006)
Purchase of treasury stock	(34,160)	0
(Distributions to) proceeds from noncontrolling interest owner	(1,700)	0
Proceeds from sale of treasury shares to employees and directors	426	1,474
Payments of debt issuance costs	(271)	(3,175)
Dividends paid	(8,044)	(6,233)
Excess tax benefit from share-based payment arrangement	1,299	1,645
Other	(1,540)	0
Net cash provided by financing activities	163,604	(11,583)
Decrease in cash and cash equivalents	(73,931)	(261,895)
Cash and cash equivalents at beginning of period	114,704	309,085
Cash and cash equivalents at end of period	$ 40,773	$ 47,190