Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Consolidated net earnings	$ 375,896	$ 336,087
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	253,200	221,418
Stock-based compensation expense	23,084	23,698
Gain on divestitures and sales of assets	(35,167)	(17,970)
Deferred income taxes	68,833	6,543
Other items, net	(2,107)	(9,894)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(132,176)	(124,622)
Inventories, net	(8,015)	(54,804)
Accounts payable	42,995	3,182
Other assets and liabilities, net	(145,005)	34,484
Net Cash Provided by Operating Activities	441,538	418,122
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(262,155)	(308,745)
Acquisitions, net	(1,640,698)	(7,200)
Proceeds from divestitures and sales of assets	63,460	33,138
Payment of railcar construction advances	(56,033)	(42,954)
Reimbursement of railcar construction advances	56,033	40,930
Investments in life insurance contracts, net	771	276
Net Cash Used for Investing Activities	(1,838,622)	(284,555)
Cash Flows from Financing Activities:
Borrowings of debt	875,000	1,011,244
Repayments of debt	(695,039)	(975,035)
Payments of deferred acquisition consideration	(6,707)
Payments on capital lease obligations	(2,589)	(2,708)
Debt issuance costs	(3,194)	(1,989)
Change in bank overdraft		1,047
Contributions by owners of noncontrolling interest		211
Dividends paid	(86,190)	(80,961)
Proceeds from exercise of stock options	6,993	10,017
Shares withheld for employees' income tax obligations	(10,416)	(10,213)
Purchase of remaining interest in existing joint venture	(12,800)
Repurchases of common stock	(60,377)	(99,999)
Net Cash Provided by (Used for) Financing Activities	4,681	(148,386)
Net Decrease in Cash and Cash Equivalents	(1,392,403)	(14,819)
Cash and Cash Equivalents, beginning of period	1,446,364	50,038
Cash and Cash Equivalents, end of period	$ 53,961	$ 35,219

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration