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Subsequent Event (Details) (Subsequent Event [Member], Term Loan [Member], USD $) In Millions, unless otherwise specified	Feb. 21, 2013
Subsequent Event [Member] \| Term Loan [Member]
Subsequent Event [Line Items]
Borrowings, draw available	$ 150
Effective interest rate	1.96%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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