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Corporate Debt (Carrying Values of Corporate Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Corporate debt	$ 917,071	$ 857,918
Senior Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Senior revolving credit facility	339,474	338,474
Senior Secured Second-Priority Notes [Member]
Debt Instrument [Line Items]
Corporate debt	428,517	432,277
Convertible Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Corporate debt	$ 149,080	$ 87,167

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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