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Allowance for Uncollectible Accounts (Tables)
 6 Months Ended
Jun. 30, 2017
Valuation and Qualifying Accounts [Abstract]  
Allowance for Uncollectible Accounts
The following table summarizes the activity in the allowance for uncollectible accounts for the six months ended June 30, 2017 (amounts in thousands):
 
Balance as of December 31, 2016
$
29,036

Additions
5,044

Deductions
(8,060
)
Balance as of June 30, 2017
$
26,020