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Allowance for Uncollectible Accounts Activity and Ending Balances (Tables)
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Allowance for Credit Losses on Financing Receivables
The following table summarizes the activity and ending balances in the allowance for uncollectible accounts for the twelve months ended December 31, 2015, 2014 and 2013 (amounts in thousands):
 
Year
 
Beginning of
Year Balance
 
Additions
 
Deductions
 
End of Year
Balance
2015
 
$
18,582

 
$
19,243

 
$
11,113

 
$
26,712

2014
 
14,334

 
15,780

 
11,532

 
18,582

2013
 
11,863

 
13,929

 
11,458

 
14,334