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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Earnings $ 219,624 $ 161,968
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities -    
Depreciation, Depletion and Amortization 87,903 67,894
Inventory Adjustment to Net Realizable Value   8,492
Deferred Income Tax Provision (50,023) 2,751
Stock Compensation Expense 10,890 9,067
Excess Tax Benefits from Share Based Payment Arrangements   (8,546)
Equity in Earnings of Unconsolidated Joint Venture (33,203) (31,371)
Distributions from Joint Venture 26,500 33,250
Changes in Operating Assets and Liabilities:    
Accounts and Notes Receivable (4,718) 6,613
Inventories 13,417 12,320
Accounts Payable and Accrued Liabilities 17,372 6,633
Other Assets (11,889) 413
Income Taxes Payable (733) 19,384
Net Cash Provided by Operating Activities 275,140 288,868
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions (83,698) (34,043)
Acquisition Spending (36,761)  
Net Cash Used in Investing Activities (120,459) (34,043)
CASH FLOWS FROM FINANCING ACTIVITIES    
Decrease in Credit Facility (40,000) (382,000)
Repayment of Senior Notes (81,214) (8,000)
Issuance of Long-term Debt   350,000
Payment of Debt Issuance Costs   (6,637)
Dividends Paid to Stockholders (14,571) (14,500)
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,607) (3,084)
Purchase and Retirement of Common Stock (24,903) (60,013)
Proceeds from Stock Option Exercises 23,729 20,137
Excess Tax Benefits from Share Based Payment Arrangements   8,546
Net Cash Used in Financing Activities (139,566) (95,551)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 15,115 159,274
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,561 5,391
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 21,676 $ 164,665