Share Repurchases (Tables)

6 Months Ended

Jun. 30, 2013

Share Repurchases [Abstract]

Schedule of Share Repurchases [Table Text Block]

Share repurchases during the three and six months ended June 30, 2013 were as follows:

	Three Months Ended		Six Months Ended
	June 30, 2013		June 30, 2013
Shares repurchased in the open market	757,819		4,805,395
Shares repurchased from holders of employee stock options	—		5,951
Total shares repurchased	757,819		4,811,346
Average price paid per share	$	78.09	$	72.98