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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Summary of Accounts Receivable
A summary of accounts receivable is as follows (in thousands):
 
December 31,
 
2015
 
2014
Oil, natural gas and NGL sales
$
61,140

 
$
139,848

Joint interest billing
60,403

 
170,937

Oil and natural gas services
2,417

 
21,436

Other
8,274

 
4,939

 
132,234

 
337,160

Less: allowance for doubtful accounts
(4,847
)
 
(7,083
)
Total accounts receivable, net
$
127,387

 
$
330,077
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, 2015, 2014 and 2013 (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Beginning balance
$
7,083

 
$
11,061

 
$
5,635

Additions charged to costs and expenses(1)
1,320

 
818

 
5,497

Deductions(2)
(3,556
)
 
(4,796
)
 
(71
)
Ending balance
$
4,847

 
$
7,083

 
$
11,061

____________________
(1)
Includes $2.7 million of allowance for receivables deemed uncollectible at December 31, 2013, primarily due to the bankruptcy status of customers.
(2)
Deductions represent write-off of receivables and collections of amounts for which an allowance had previously been established. Deductions in 2015 are primarily due to the write-off of receivables in conjunction with a lawsuit settlement, and deductions in 2014 are related to the sale of the Gulf Properties.