Note Payable	12 Months Ended
Dec. 31, 2017
Notes Payable, Current [Abstract]
Note Payable	Note Payable We have one line of credit 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 2017 or 2016. At December 31, 2017 and 2016, $24 million and $20 million was drawn on the line of credit, respectively. The interest rate charged on our borrowings on this credit agreement ranged from 1.65 percent to 2.45 percent during 2017 and ranged from 1.31 percent to 1.49 percent during 2016.

Note Payable

12 Months Ended

Dec. 31, 2017

We have one line of credit 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 2017 or 2016. At December 31, 2017 and 2016, $24 million and $20 million was drawn on the line of credit, respectively. The interest rate charged on our borrowings on this credit agreement ranged from 1.65 percent to 2.45 percent during 2017 and ranged from 1.31 percent to 1.49 percent during 2016.