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Accounts Receivable
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable
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



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.