Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Consolidated net earnings	$ 205,715	$ 90,305
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	199,935	154,079
Stock-based compensation expense	10,722	6,381
Loss (gain) on divestitures and sales of assets	27,568	(47,815)
Deferred income taxes	43,286	44,970
Excess tax benefits from stock-based compensation transactions		(2,354)
Other items, net	(6,554)	1,766
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(155,054)	(120,139)
Inventories, net	(17,650)	1,283
Accounts payable	22,186	26,515
Other assets and liabilities, net	(10,575)	46,637
Net Cash Provided by Operating Activities	319,579	201,628
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(212,447)	(138,570)
Acquisitions, net	(10,748)	(174)
Cash received in acquisition		59,887
Proceeds from divestitures and sales of assets	422,045	113,158
Repayments from affiliate	1,808	850
Payment of railcar construction advances	(25,341)	(14,513)
Reimbursement of railcar construction advances	25,234	14,513
Net Cash Provided by Investing Activities	200,551	35,151
Cash Flows from Financing Activities:
Borrowings of long-term debt	230,000	868,762
Repayments of long-term debt	(111,384)	(1,024,052)
Payments on capital lease obligations	(5,784)	(2,177)
Debt issuance costs		(2,402)
Change in bank overdraft	(183)	(2,556)
Dividends paid	(81,219)	(64,263)
Purchase of remaining interest in existing subsidiaries		(19,480)
Issuances of common stock	33,892	38,195
Repurchases of common stock	(257,674)
Excess tax benefits from stock-based compensation transactions		2,354
Net Cash Used for Financing Activities	(192,352)	(205,619)
Net Increase in Cash and Cash Equivalents	327,778	31,160
Cash and Cash Equivalents, beginning of period	108,651	42,437
Cash and Cash Equivalents, end of period	436,429	73,597
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	47,069	56,162
Cash paid for income taxes	$ 30,896	$ 6,011