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Allowance for Uncollectible Accounts
 6 Months Ended
Jun. 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 six months ended June 30, 2016 (amounts in thousands):
 
Balance as of December 31, 2015
$
26,712

Additions
8,383

Deductions
(6,403
)
Balance as of June 30, 2016
$
28,692