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Debt (Details 3) (USD $)	3 Months Ended		0 Months Ended				3 Months Ended				0 Months Ended	3 Months Ended		3 Months Ended
	May 31, 2014	Feb. 28, 2014	Mar. 01, 2014 Unsecured state industrial development loan	May 31, 2014 Unsecured state industrial development loan	Mar. 31, 2014 Unsecured state industrial development loan	Feb. 28, 2014 Unsecured state industrial development loan	May 31, 2014 Unsecured state industrial development loan Base Rate	May 31, 2014 Unsecured state industrial development loan Base Rate Maximum	May 31, 2014 Unsecured state industrial development loan LIBOR	May 31, 2014 Unsecured state industrial development loan LIBOR Maximum	Jun. 30, 2014 Unsecured floating interest rate 10 year Senior Notes	May 31, 2014 Unsecured floating interest rate 10 year Senior Notes	Feb. 28, 2014 Unsecured floating interest rate 10 year Senior Notes	May 31, 2014 3.90% unsecured Senior Notes payable	Feb. 28, 2014 3.90% unsecured Senior Notes payable
Long-term debt
Face amount				$ 37,610,000	$ 37,610,000							$ 75,000,000		$ 100,000,000
Basis spread on variable rate (as percent)								1.125%		2.125%		0.90%
Variable Rate Basis							Base rate		LIBOR			three-month LIBOR
Interest rate (as a percent)														3.90%
Interest rate (as a percent)				1.90%								6.01%		3.90%
Frequency of principal payment														Annual
Principal payments														20,000,000
Total long-term debt	190,707,000	192,607,000		35,707,000		37,607,000						75,000,000	75,000,000	80,000,000	80,000,000
Less current maturities of long-term debt	(96,900,000)	(96,900,000)
Long-term debt, excluding current maturities	93,807,000	95,707,000
Repayment of principal	$ 1,900,000		$ 1,900,000								$ 75,000,000

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