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Allowance for Uncollectible Accounts (Tables)
3 Months Ended
Mar. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Allowance for Uncollectible Accounts
The following table summarizes the activity in the allowance for uncollectible accounts for the three months ended March 31, 2016 (amounts in thousands):
 
Balance as of December 31, 2015
$
26,712

Additions
4,601

Deductions
(2,696
)
Balance as of March 31, 2016
$
28,617