Note Payable	12 Months Ended
Dec. 31, 2012
Note Payable [Abstract]
Note Payable	7. Note Payable We have one line of credit with multiple commercial banks with a borrowing capacity of $225 million, with an additional $50 million accordion feature. At December 31 , 2012, $104 million was drawn on the line of credit. This credit agreement replaces the two lines of credit with commercial banks with an aggregate borrowing capacity of $225 million at December 31, 2011. The 2012 credit agreement is a new $225 million unsecured revolving credit facility with a term of five years expiring May 31, 2017. We had no compensating balance requirements on short-term debt for either 2012 or 2011. The interest rate charged on our borrowings on this credit agreement ranged from 0.7 percent to 2.58 percent during 2012.

7. Note Payable

We have one line of credit with multiple commercial banks with a borrowing capacity of $225 million, with an additional $50 million accordion feature. At December 31 , 2012, $104 million was drawn on the line of credit. This credit agreement replaces the two lines of credit with commercial banks with an aggregate borrowing capacity of $225 million at December 31, 2011. The 2012 credit agreement is a new $225 million unsecured revolving credit facility with a term of five years expiring May 31, 2017. We had no compensating balance requirements on short-term debt for either 2012 or 2011. The interest rate charged on our borrowings on this credit agreement ranged from 0.7 percent to 2.58 percent during 2012.