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Note Payable	12 Months Ended
Note Payable	Dec. 31, 2014
Notes Payable, Current [Abstract]
Note Payable	Note Payable We have one line of credit in 2014 and 2013 through multiple commercial banks with a borrowing capacity of $225 million and an additional $50 million accordion feature. Our unsecured revolving credit facility has a term of five years that expires May 13, 2019. We had no compensating balance requirements on short-term debt for either 2014 or 2013. At December 31, 2014, $49 million was drawn on the line of credit. At December 31, 2013, $104 million was drawn on the line of credit. The interest rate charged on our borrowings on this credit agreement ranged from 1.15 percent to 1.30 percent during 2014 and ranged from 1.30 percent to 1.35 percent during 2013.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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