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

A summary of accounts receivable is as follows (in thousands):
 
December 31,
 
2012
 
2011
Oil and natural gas sales
$
215,450

 
$
134,491

Joint interest billing
202,405

 
49,688

Oil and natural gas services
21,186

 
18,798

Insurance receivable
4,590

 
—

Production tax credits
2,265

 
3,331

Related party
978

 
1,645

Other
4,267

 
2,289

 
451,141

 
210,242

Less: allowance for doubtful accounts
(5,635
)
 
(3,906
)
Total accounts receivable, net
$
445,506

 
$
206,336



The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2012, 2011 and 2010 (in thousands):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Allowance for doubtful accounts at January 1
$
3,906

 
$
1,503

 
$
3,590

Additions charged to costs and expenses
1,735

 
2,511

 
129

Deductions(1)
(6
)
 
(108
)
 
(2,216
)
Allowance for doubtful accounts at December 31
$
5,635

 
$
3,906

 
$
1,503

____________________
(1)
Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.

During 2008, the Company established an allowance of $1.5 million for the outstanding balance from a customer in bankruptcy. During 2010, the Company received approximately $0.7 million from this customer and wrote off the remaining $0.8 million balance for a total reduction of the allowance of $1.5 million. During 2011, the Company established an allowance of $2.5 million for amounts subject to ongoing disputes and contract negotiations.