Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Consolidated net earnings	$ 195,543	$ 184,548
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	163,545	146,102
Stock-based compensation expense	17,098	17,727
Gain on divestitures and sales of assets	(33,527)	(17,514)
Deferred income taxes	14,986	2,464
Other items, net	(4,757)	(4,669)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(157,603)	(112,708)
Inventories, net	(7,133)	(28,240)
Accounts payable	44,266	11,663
Other assets and liabilities, net	5,615	29,950
Net Cash Provided by Operating Activities	238,033	229,323
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(188,270)	(216,089)
Acquisitions, net	(1,645,698)	(2,200)
Proceeds from divestitures and sales of assets	58,213	32,089
Payment of railcar construction advances	(28,306)	(40,930)
Reimbursement of railcar construction advances	28,306	40,930
Investments in life insurance contracts, net	424	276
Net Cash Used for Investing Activities	(1,775,331)	(185,924)
Cash Flows from Financing Activities:
Borrowings of debt	665,000	941,244
Repayments of debt	(475,025)	(845,023)
Payments of deferred acquisition consideration	(1,426)
Payments on capital lease obligations	(1,725)	(1,752)
Debt issuance costs	(3,194)	(1,055)
Change in bank overdraft		3,795
Contributions by owners of noncontrolling interest		211
Dividends paid	(55,795)	(53,135)
Proceeds from exercise of stock options	6,943	7,937
Shares withheld for employees' income tax obligations	(10,065)	(8,938)
Repurchases of common stock		(99,999)
Net Cash Provided by (Used for) Financing Activities	124,713	(56,715)
Net Decrease in Cash and Cash Equivalents	(1,412,585)	(13,316)
Cash and Cash Equivalents, beginning of period	1,446,364	50,038
Cash and Cash Equivalents, end of period	$ 33,779	$ 36,722

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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