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Fair Value (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Book value of debt [Abstract]
Senior notes payable	$ 400,250,000	$ 229,250,000
Junior subordinated note payable	0	50,000,000
Total long-term debt	400,250,000
Book value [Member]
Book value of debt [Abstract]
Total long-term debt	400,250,000	279,250,000
Book value [Member] \| Senior notes payable [Member]
Book value of debt [Abstract]
Senior notes payable	400,250,000	229,250,000
Book value [Member] \| Junior subordinated notes payable [Member]
Book value of debt [Abstract]
Junior subordinated note payable	0	50,000,000
Estimated fair value [Member]
Estimated fair value of debt [Abstract]
Long-term debt, estimated fair value	400,250,000	279,250,000
Estimated fair value [Member] \| Senior notes payable [Member]
Book value of debt [Abstract]
Senior notes payable	400,250,000	229,250,000
Estimated fair value [Member] \| Junior subordinated notes payable [Member]
Book value of debt [Abstract]
Junior subordinated note payable	$ 0	$ 50,000,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- 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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