Share Repurchases (Tables)

9 Months Ended

Sep. 30, 2013

Share Repurchases [Abstract]

Schedule of Share Repurchases [Table Text Block]

Share repurchases during the three and nine months ended September 30, 2013 were as follows:

	Three Months Ended		Nine Months Ended
	September 30, 2013		September 30, 2013
Shares repurchased in the open market	649,840		5,455,235
Shares repurchased from holders of employee stock options	—		5,951
Total shares repurchased	649,840		5,461,186
Average price paid per share	$	87.33	$	74.68