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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Earnings $ 45,344 $ 37,762
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities -    
Depreciation, Depletion and Amortization 22,863 24,264
Deferred Income Tax Provision 1,822 (4,369)
Stock Compensation Expense 2,594 4,018
Excess Tax Benefits from Share Based Payment Arrangements (3,299) (1,142)
Equity in Earnings of Unconsolidated Joint Venture (7,980) (7,830)
Distributions from Joint Venture 8,750 6,245
Changes in Operating Assets and Liabilities:    
Accounts and Notes Receivable (22,057) (22,075)
Inventories 2,596 723
Accounts Payable and Accrued Liabilities (12,913) (26,852)
Other Assets (2,478) 75
Income Taxes Payable 18,841 9,796
Net Cash Provided by Operating Activities 54,083 20,615
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions (8,978) (27,122)
Net Cash Used in Investing Activities (8,978) (27,122)
CASH FLOWS FROM FINANCING ACTIVITIES    
Increase (Decrease) in Credit Facility (9,000) 11,000
Dividends Paid to Stockholders (4,828) (5,025)
Purchase and Retirement of Common Stock (39,135)  
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,284) (1,523)
Proceeds from Stock Option Exercises 10,632 950
Excess Tax Benefits from Share Based Payment Arrangements 3,299 1,142
Net Cash Provided by (Used in) Financing Activities (41,316) 6,544
NET INCREASE IN CASH AND CASH EQUIVALENTS 3,789 37
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 5,391 7,514
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 9,180 $ 7,551