Restricted Investments Contractual Maturities of Our Held-to-Maturity Restricted Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 76,957
Amortized Cost, Due one year through five years	5,079
Amortized Cost, Total	82,036
Estimated Fair Value, Due in one year or less	76,963
Estimated Fair Value, Due one year through five years	5,083
Estimated Fair Value, Total	$ 82,046

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of held-to-maturity debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of held-to-maturity debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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Fair value of investments in debt securities classified as held-to-maturity.

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