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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012
Commodity swaps / forwards
Long-term Debt	$ (752,137)	$ (753,363)
Interest Rate Swaps [Member]
Commodity swaps / forwards
Derivative Assets		4,078
Foreign Currency Forwards [Member]
Commodity swaps / forwards
Derivative Assets		104
Derivative Liabilities	(358)	(5,725)
Commodity swaps [Member]
Commodity swaps / forwards
Derivative Assets		320
Derivative Liabilities	(4,704)	(697)
Senior Secured Notes Due 2018 [Member]
Commodity swaps / forwards
Long-term Debt, Fair Value	(529,875)	(562,781)
Long-term Debt	(675,000)	(675,000)
Convertible Senior Subordinated Notes due 2013 [Member]
Commodity swaps / forwards
Long-term Debt, Fair Value	(52,800)	(51,000)
Long-term Debt	$ (60,000)	$ (60,000)

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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