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Allowance for Uncollectible Accounts Activity and Ending Balances (Tables)
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
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