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Firm Transportation Obligation
 12 Months Ended
Dec. 31, 2015
Restructuring and Related Activities [Abstract]  
Firm Transportation Obligation
We have a contractual obligation for certain firm transportation capacity in the Appalachian region that expires in 2022 and, as a result of the sale of our natural gas assets in West Virginia, Kentucky and Virginia in 2012, we no longer have production to satisfy this commitment. While we sell our unused firm transportation to the extent possible, we recognized an obligation in 2012 representing the liability for estimated discounted future net cash outflows over the remaining term of the contract. The undiscounted amount payable on an annual basis for the each of the next five years is $2.7 million and a combined amount of $4.6 million is expected to be payable for 2021 through expiration in 2022.
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


The accretion of this obligation, net of any recoveries from the periodic sale of our contractual capacity, is charged as an offset to Other revenue.
As of December 31, 2015, $2.8 million of the obligation is classified as current and is included in the Accounts payable and accrued liabilities while the remaining $10.7 million is classified as noncurrent and is included in the Other liabilities caption on our Condensed Consolidated Balance Sheets.