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Accounts Receivable
 12 Months Ended
Dec. 31, 2013
Accounts Receivable, Net, Current [Abstract]  
Accounts Receivable
Accounts Receivable

A summary of accounts receivable is as follows (in thousands):
 
December 31,
 
2013
 
2012
Oil, natural gas and NGL sales
$
166,157

 
$
215,450

Joint interest billing
168,596

 
202,405

Oil and natural gas services
17,904

 
21,186

Insurance receivable
2,500

 
4,590

Related party
—

 
978

Other
5,122

 
6,532

 
360,279

 
451,141

Less: allowance for doubtful accounts
(11,061
)
 
(5,635
)
Total accounts receivable, net
$
349,218

 
$
445,506



The following table presents the balance and activity in the allowance for doubtful accounts for the years ended December 31, 2013, 2012 and 2011 (in thousands):
 
Year Ended December 31,
 
2013
 
2012
 
2011
Allowance for doubtful accounts at January 1
$
5,635

 
$
3,906

 
$
1,503

Additions charged to costs and expenses(1)
5,497

 
1,735

 
2,511

Deductions(2)
(71
)
 
(6
)
 
(108
)
Allowance for doubtful accounts at December 31
$
11,061

 
$
5,635

 
$
3,906

____________________
(1)
Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013 primarily due to bankruptcy status of customers.
(2)
Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established.