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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Accounts Receivable

Note 5 – Accounts Receivable

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31,

 

 

2012

 

2011

 

 

 

 

 

Billed utility revenue

$
54,294 

$
47,311 

Unbilled utility revenue

 
33,590 

 
29,361 

Other

 
9,358 

 
3,359 

 

 
97,242 

 
80,031 

Less allowance for doubtful accounts

 
4,321 

 
4,485 

Net accounts receivable

$
92,921 

$
75,546 

 

 

 

 

 

 

The Company’s utility customers are located principally in the following states: 47% in Pennsylvania, 16% in Ohio, 10% in North Carolina, 8% in Texas, and 7% in Illinois. No single customer accounted for more than one percent of the Company's regulated operating revenues during the years ended December 31, 2012, 2011, and 2010.  The following table summarizes the changes in the Company’s allowance for doubtful accounts:

 

 

 

 

 

 

 

 

 

 

2012

2011

2010

 

 

 

 

 

 

 

Balance at January 1,

$
4,485 

$
4,367 

$
4,790 

Amounts charged to expense

 
4,805 

 
4,854 

 
4,156 

Accounts written off

 
(5,939)

 
(5,780)

 
(5,489)

Recoveries of accounts written off

 
970 

 
1,044 

 
910 

Balance at December 31,

$
4,321 

$
4,485 

$
4,367