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Allowance for Uncollectible Accounts
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Allowance for Uncollectible Accounts
13. Allowance for Uncollectible Accounts
The following table summarizes the activity and ending balances in the allowance for uncollectible accounts for the twelve months ended December 31, 2014, 2013 and 2012 (amounts in thousands):
 
Year
 
Beginning of
Year Balance
 
Additions
 
Deductions
 
End of Year
Balance
2014
 
$
14,334

 
$
15,780

 
$
11,532

 
$
18,582

2013
 
11,863

 
13,929

 
11,458

 
14,334

2012
 
10,692

 
11,875

 
10,704

 
11,863