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Subsequent Event (Notes)	6 Months Ended
Subsequent Event (Notes)	Jun. 30, 2014
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On July 15, 2014, the Company amended its revolving credit facility to provide for a $200 million term loan. This term loan will have an eight-year term and a variable rate based on the one-month London Interbank Offered Rate (LIBOR) plus a fixed spread. The Company will use this term loan combined with commercial paper borrowings to refinance $400 million public notes maturing in August 2014.