Fair Value Measurements (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ (751,207)		$ (753,363)
Senior Secured Notes due 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	(675,000)		(675,000)
Long-term Debt, Fair Value	(580,500)		(562,781)
Convertible Senior Subordinated Notes due 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	(55,750)		(60,000)
Long-term Debt, Fair Value	(52,864)		(51,000)
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	0	[1]	4,078	[1]
Long-term Debt, Fair Value	0	[1]	4,078	[1]
Foreign currency forwards
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	25	[1]	104	[1]
Derivative Liabilities	0	[1]	(5,725)	[1]
Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	141	[1]	320	[1]
Derivative Liabilities	$ 0	[1]	$ (697)	[1]

[1] These financial instruments are required to be measured at fair value, and are based on inputs as described in the three-tier hierarchy that prioritizes inputs used in measuring fair value as of the reported date:•Level 1 – Observable inputs such as quoted prices in active markets for identical assets and liabilities;•Level 2 – Inputs other than quoted prices in active markets that are observable either directly or indirectly; and•Level 3 – Inputs from valuation techniques in which one or more key value drivers are not observable, and must be based on the reporting entity’s own assumptions.