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Firm Transportation Obligation (Tables)
 12 Months Ended
Dec. 31, 2015
Restructuring and Related Activities [Abstract]  
Summary of Restructuring Related Obligations
The following table summarizes our firm transportation obligation and the changes therein for the years ended December 31, 2015, 2014 and 2013:
 
2015
 
2014
 
2013
Balance at beginning of period
$
14,790

 
$
15,993

 
$
17,082

Accretion of obligations
942

 
1,301

 
1,674

Cash payments, net
(2,271
)
 
(2,504
)
 
(2,763
)
Balance at end of period
$
13,461

 
$
14,790

 
$
15,993