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Fair Value (Fair Value Of Financial Instruments) (Narrative) (Details) (Standby Letters of Credit [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Standby Letters of Credit [Member]
Schedule of Investments [Line Items]
Supply Commitment, Remaining Minimum Amount Committed	$ 1.6

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

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