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Subsequent Events (Details) (Subsequent Event, USD $)	Dec. 20, 2012
Subsequent Event
Amendment Agreement No. 3 [Line Items]
Borrowed funds extended by subfacility	$ 670,000,000
Long-term Debt	$ 650,000,000
Debt instrument, basis spread on variable rate	3.25%
Discount Percentage on Parent Company Notes	0.25%

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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