Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Consolidated net earnings	$ 232,296	$ 195,543
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	181,986	163,545
Stock-based compensation expense	22,250	17,098
Gain on divestitures and sales of assets	(3,927)	(33,527)
Deferred income taxes	(6,393)	14,986
Other items, net	14,892	(4,757)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(187,076)	(157,603)
Inventories, net	15,744	(7,133)
Accounts payable	36,614	44,266
Other assets and liabilities, net	27,345	5,615
Net Cash Provided by Operating Activities	333,731	238,033
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(207,452)	(188,270)
Acquisitions, net		(1,645,698)
Proceeds from divestitures and sales of assets	5,997	58,213
Payment of railcar construction advances		(28,306)
Reimbursement of railcar construction advances		28,306
Investments in life insurance contracts, net	527	424
Other investing activities, net	(957)
Net Cash Used for Investing Activities	(201,885)	(1,775,331)
Cash Flows from Financing Activities:
Borrowings of debt	165,000	665,000
Repayments of debt	(170,028)	(475,025)
Payments of deferred acquisition consideration		(1,426)
Payments on finance leases	(1,820)
Payments on capital lease		(1,725)
Debt issuance costs		(3,194)
Distributions to owners of noncontrolling interest	(600)
Share repurchases	(50,000)
Dividends paid	(60,615)	(55,795)
Proceeds from exercise of stock options	7,094	6,943
Shares withheld for employees' income tax obligations	(12,174)	(10,065)
Net Cash (Used for) Provided by Financing Activities	(123,143)	124,713
Net Increase (Decrease) in Cash and Cash Equivalents	8,703	(1,412,585)
Cash and Cash Equivalents, beginning of period	44,892	1,446,364
Cash and Cash Equivalents, end of period	$ 53,595	$ 33,779

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The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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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).

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Amount of noncash expense for share-based payment arrangement.

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