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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Accounts Receivable, Net, Current [Abstract]  
Summary of 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
Balance and Activity in Allowance for Doubtful Accounts
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.