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Allowance for Uncollectible Accounts (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 (amounts in thousands):
 
Balance as of December 31, 2013
$
14,334

Additions
11,699

Deductions
(8,570
)
Balance as of September 30, 2014
$
17,463