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Revolving Credit Facility (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Bank Borrowings And Capital Lease Obligations [Abstract]
Issued and outstanding letters of credit	$ 6.4	$ 6.0
Deferred financing costs	$ 0.5	$ 0.4

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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