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Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 196,657	$ 219,624
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Non-Cash Activity -
Depreciation, Depletion and Amortization	91,961	87,903
Deferred Income Tax Provision	14,552	(50,023)
Stock Compensation Expense	11,609	10,890
Equity in Earnings of Unconsolidated Joint Venture	(28,931)	(33,203)
Distributions from Joint Venture	27,500	26,500
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	4,905	(4,718)
Inventories	6,899	13,417
Accounts Payable and Accrued Liabilities	(34,964)	17,372
Other Assets	(1,524)	(11,889)
Income Taxes Payable (Receivable)	5,436	(733)
Net Cash Provided by Operating Activities	294,100	275,140
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(126,446)	(83,698)
Acquisition Spending		(36,761)
Proceeds from Sale of Property, Plant, and Equipment	2,281
Net Cash Used in Investing Activities	(124,165)	(120,459)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Decrease) in Credit Facility	5,000	(40,000)
Repayment of Private Placement Senior Unsecured Notes		(81,214)
Dividends Paid to Stockholders	(14,293)	(14,571)
Purchase and Retirement of Common Stock	(191,800)	(24,903)
Proceeds from Stock Option Exercises	1,992	23,729
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(1,842)	(2,607)
Net Cash Used in Financing Activities	(200,943)	(139,566)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	(31,008)	15,115
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	48,068	6,561
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 17,060	$ 21,676

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