Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Stock by Class [Table Text Block]

The following table summarizes transactions relating to Common Stock for the three years’ ending December 31, 2012:

	Issued Shares		Treasury Stock Shares
Balance at December 31, 2009		156,234,415		60,356,672
Issuances under stock plans		—		(4,029,673	)
Purchases for treasury		—		3,918,719
Balance at December 31, 2010		156,234,415		60,245,718
Issuances under stock plans		—		(3,244,705	)
Purchases for treasury (1)		—		5,890,238
Balance at December 31, 2011		156,234,415		62,891,251
Issuances under stock plans		—		(2,756,389	)
Purchases for treasury		—		2,738,238
Balance at December 31, 2012		156,234,415		62,873,100