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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
 
 
 
 
Additions
 
 
 
 
 
 
 
 
Balance at
Beginning of
Period
 
Charged to
Costs and
Expenses
 
Charged to
Other
Accounts
 
Write-offs
 
Other(1)
 
Balance
at End
of Period
Year ended December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
16,546

 
$
7,360

 
$
—

 
$
(6,325
)
 
$
121

 
$
17,702

Year ended December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
14,978

 
$
6,396

 
$
—

 
$
(5,134
)
 
$
306

 
$
16,546

Year ended December 31, 2011
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts(2)
 
$
13,801

 
$
6,742

 
$
—

 
$
(6,178
)
 
$
613

 
$
14,978


 
(1) 
“Other” changes in the allowance for uncollectible accounts include allowances acquired with animal hospitals and laboratory acquisitions.

(2) 
Balance includes allowance for trade accounts receivable and notes receivable.