Subsequent Events	9 Months Ended
Sep. 30, 2011
Subsequent Events [Abstract]
Subsequent Events [Text Block]	12. Subsequent Events In October 2011, the Company entered into a five year $500 million revolving credit facility to replace the $350 million credit facility scheduled to expire in October 2012. The new credit facility, which serves as a backup to our commercial paper program, is scheduled to expire in October 2016. The interest rate applicable to borrowing under the new credit agreement is generally either the prime rate or a surcharge over LIBOR. The single financial covenant in the $500 million credit facility requires that total debt not exceed 55% of total capitalization. Annual commitment fees to support availability under the credit facility are not material.

Subsequent Events

9 Months Ended

Sep. 30, 2011

12. Subsequent Events

In October 2011, the Company entered into a five year $500 million revolving credit facility to replace the $350 million credit facility scheduled to expire in October 2012. The new credit facility, which serves as a backup to our commercial paper program, is scheduled to expire in October 2016. The interest rate applicable to borrowing under the new credit agreement is generally either the prime rate or a surcharge over LIBOR. The single financial covenant in the $500 million credit facility requires that total debt not exceed 55% of total capitalization. Annual commitment fees to support availability under the credit facility are not material.