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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
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, 2016
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts (2)
 
$
21,775

 
$
8,306

 
$
—

 
$
(5,509
)
 
$
(1,132
)
 
$
23,440

Year ended December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts (2)
 
$
19,846

 
$
8,401

 
$
—

 
$
(6,098
)
 
$
(374
)
 
$
21,775

Year ended December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts (2)
 
$
17,702

 
$
6,248

 
$
—

 
$
(6,129
)
 
$
2,025

 
$
19,846


 ____________________________
(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.