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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 
December 31,
 
2014
 
2013
Oil, natural gas and NGL sales
$
139,848

 
$
166,157

Joint interest billing
170,937

 
168,596

Oil and natural gas services
21,436

 
17,904

Insurance receivable
—

 
2,500

Other
4,939

 
5,122

 
337,160

 
360,279

Less: allowance for doubtful accounts
(7,083
)
 
(11,061
)
Total accounts receivable, net
$
330,077

 
$
349,218
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, 2014, 2013 and 2012 (in thousands):
 
Year Ended December 31,
 
2014
 
2013
 
2012
Allowance for doubtful accounts at January 1
$
11,061

 
$
5,635

 
$
3,906

Additions charged to costs and expenses(1)
818

 
5,497

 
1,735

Deductions(2)
(4,796
)
 
(71
)
 
(6
)
Allowance for doubtful accounts at December 31
$
7,083

 
$
11,061

 
$
5,635

____________________
(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. Year ended December 31, 2014 represents write-off of allowance related to the sale of the Gulf Properties.