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Allowance for Uncollectible Accounts (Tables)
 9 Months Ended
Sep. 30, 2015
Valuation and Qualifying Accounts [Abstract]  
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