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Business Acquisitions (Tables)
9 Months Ended
Sep. 30, 2012
Notes to Financial Statements [Abstract]  
Fair Value of Assets Acquired and Liabilities Assumed Table
Current assets
$          96,883
 
Identifiable intangibles
669,000
 
Goodwill
991,162
 
Other assets
2,694
 
Total assets acquired
1,759,739
 
Deferred revenue
(83,065
)
Other current liabilities
(18,762
)
Long-term deferred tax liability
(241,932
)
Net assets acquired
$    1,415,980
 
Business Acquisition, Pro Forma Information [Table Text Block]
Pro forma
 
 
Three months ended
September 30,
 
 
Nine months ended
September 30,
 
 
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Sales
 
$
780,278
 
 
$
752,172
 
 
$
2,320,497
 
 
$
2,177,821
 
Net income
 
 
128,226
 
 
 
118,862
 
 
 
380,046
 
 
 
320,991
 
Earnings per share, basic
 
 
1.31
 
 
 
1.24
 
 
 
3.90
 
 
 
3.35
 
Earnings per share, diluted
 
 
1.29
 
 
 
1.21
 
 
 
3.82
 
 
 
3.27