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Accounts Receivable
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Accounts Receivable
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



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.