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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule II and Index of Exhibits [Abstract]  
Summary of Valuation Allowance [Table Text Block]
OMNICARE, INC. AND SUBSIDIARY COMPANIES
Valuation and Qualifying Accounts
(in thousands)

Year ended
December 31,
 
Balance at
beginning of
period
 
Additions
charged
to cost
and expenses
 
Write-offs,
(net of recoveries) and other
 
Balance
at end
of period
Allowance for uncollectible accounts receivable:
 
 
 
 
2012
 
$
358,713

 
$
99,407

 
$
(188,704
)
 
$
269,416

2011
 
401,027

 
98,552

 
(140,866
)
 
358,713

2010
 
332,541

 
136,630

 
(68,144
)
 
401,027

Tax valuation allowance:
 
 

 
 

 
 

2012
 
$
20,502

 
$
3,765

 
$
(3,230
)
 
$
21,037

2011
 
18,418

 
4,151

 
(2,067
)
 
20,502

2010
 
22,594

 
(3,723
)
 
(453
)
 
18,418