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Allowance for Uncollectible Accounts
 9 Months Ended
Sep. 30, 2015
Valuation and Qualifying Accounts [Abstract]  
Allowance for Uncollectible Accounts
Allowance for Uncollectible Accounts
The following table summarizes the activity in the allowance for uncollectible accounts for the nine months ended September 30, 2015 (amounts in thousands):
 
Balance as of December 31, 2014
$
18,582

Additions
14,873

Deductions
(7,524
)
Balance as of September 30, 2015
$
25,931