Business Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Business Acquisitions [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

Current assets	$	96,883
Identifiable intangibles		669,000
Goodwill		992,164
Other assets		2,694
Total assets acquired		1,760,741
Deferred revenue		(83,065	)
Other current liabilities		(18,762	)
Long-term deferred tax liability		(242,934	)
Net assets acquired	$	1,415,980

Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block]

	Pro forma
	Year ended December 31,
	2012		2011
Sales	$	3,130,407	$	2,967,415
Net income		521,141		454,059
Earnings per share, basic		5.33		4.73
Earnings per share, diluted		5.23		4.62

Fair Value of Assets Acquired and Liabilities Assumed Table

	July 27, 2010
Current assets	$	14,174
Other assets		2,998
Intangible assets		313,600
Goodwill		317,897
Total assets acquired		648,669
Current liabilities		(15,301	)
Other liabilities		(110,767	)
Net assets acquired	$	522,601