Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities:
Consolidated net earnings	$ 88,138	$ 36,472
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	134,958	86,147
Stock-based compensation expense	7,524	4,370
Gains on divestitures and sales of assets	(853)	(1,747)
Deferred income taxes	33,906	(6,433)
Excess tax benefits from stock-based compensation transactions	(55)	(1,922)
Other items, net	(341)	3,227
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(76,061)	(98,911)
Inventories, net	(27,661)	(4,269)
Accounts payable	(3,416)	35,842
Other assets and liabilities, net	(29,070)	17,587
Net Cash Provided by Operating Activities	127,069	70,363
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(127,990)	(84,737)
Acquisitions, net	(10,713)	(117)
Proceeds from divestitures and sales of assets	1,972	2,154
Repayments from affiliate	1,808	529
Payment of railcar construction advances	(25,234)	(14,513)
Reimbursement of railcar construction advances	25,234	14,513
Net Cash Used for Investing Activities	(134,923)	(82,171)
Cash Flows from Financing Activities:
Borrowings of long-term debt	80,000	100,000
Repayments of long-term debt	(8,144)	(46,417)
Payments on capital lease obligations	(1,831)	(1,052)
Debt issuance costs		(881)
Change in bank overdraft	(183)	(2,556)
Dividends paid	(54,285)	(37,254)
Purchase of remaining interest in existing subsidiaries		(19,604)
Issuances of common stock	27,760	9,542
Repurchases of common stock	(100,000)
Excess tax benefits from stock-based compensation transactions	55	1,922
Net Cash (Used for) Provided by Financing Activities	(56,628)	3,700
Net Decrease in Cash and Cash Equivalents	(64,482)	(8,108)
Cash and Cash Equivalents, beginning of period	108,651	42,437
Cash and Cash Equivalents, end of period	44,169	34,329
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	35,447	25,173
Cash paid for income taxes	$ 24,334	$ 3,511