Consolidated Statements of Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 366,121	$ 297,504
Cost of Goods Sold	280,062	225,549
Gross Profit	86,059	71,955
Equity in Earnings of Unconsolidated Joint Venture	9,876	7,980
Corporate General and Administrative	(9,679)	(9,833)
Other Income	757	1,075
Interest Expense, Net	(7,483)	(3,901)
Earnings Before Income Taxes	79,530	67,276
Income Tax Expense	(24,648)	(21,932)
Net Earnings	$ 54,882	$ 45,344
EARNINGS PER SHARE:
Basic	$ 1.14	$ 0.94
Diluted	$ 1.13	$ 0.93
AVERAGE SHARES OUTSTANDING:
Basic	48,121,890	48,014,195
Diluted	48,655,553	48,522,207
CASH DIVIDENDS PER SHARE:	$ 0.10	$ 0.10