Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net sales	$ 223,632	$ 289,856
Operating costs and expenses:
Cost of sales	191,321	210,504
Selling, general and administrative expenses	27,255	30,276
Research and development	7,733	7,086
Restructuring charges	1,264	1,025
Net loss on sales and disposals of assets	104	123
Total operating costs and expenses	227,677	249,014
Operating income (loss)	(4,045)	40,842
Other (income) expense:
Interest income	(31)	(43)
Interest expense	10,457	7,400
Other (income) expense, net	1,511	(95)
Income (loss) before income taxes	(15,982)	33,580
Income tax expense	1,771	1,731
Net income (loss)	$ (17,753)	$ 31,849
Net income (loss) per share:
Basic (in dollars per share)	$ (0.40)	$ 0.81
Diluted (in dollars per share)	$ (0.40)	$ 0.61
Weighted-average shares outstanding:
Basic (in shares)	44,808	39,452
Diluted (in shares)	44,808	52,338