Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Current Assets -
Cash and Cash Equivalents	$ 10,628	$ 3,897
Accounts and Notes Receivable	119,748	87,543
Inventories	162,094	156,380
Income Tax Receivable		2,443
Prepaid and Other Assets	8,235	11,008
Total Current Assets	300,705	261,271
Property, Plant and Equipment -	1,636,244	1,599,992
Less: Accumulated Depreciation	(646,142)	(614,268)
Property, Plant and Equipment, net	990,102	985,724
Notes Receivable	3,488	3,893
Investment in Joint Venture	40,071	42,946
Goodwill and Intangible Assets	161,432	162,400
Other Assets	14,377	19,999
Total Assets	1,510,175	1,476,233
Current Liabilities -
Accounts Payable	50,878	58,880
Accrued Liabilities	40,785	41,349
Income Taxes Payable	10,028
Total Current Liabilities	101,691	100,229
Long-term Debt	455,259	489,259
Other Long-term Liabilities	53,334	51,547
Deferred Income Taxes	135,571	139,028
Total Liabilities	745,855	780,063
Stockholders' Equity -
Preferred Stock, Par Value $0.01; Authorized 5,000,000 Shares; None Issued
Common Stock, Par Value $0.01; Authorized 100,000,000 Shares; Issued and Outstanding 49,675,688 and 49,503,496 Shares, respectively	497	495
Capital in Excess of Par Value	231,836	224,053
Accumulated Other Comprehensive Losses	(6,732)	(7,042)
Retained Earnings	538,719	478,664
Total Stockholders' Equity	764,320	696,170
Liabilities and Stockholders' Equity, Total	$ 1,510,175	$ 1,476,233