A reconciliation of our liability for plugging and abandonment costs for the years ended December 31, 2013 and 2012 is as follows (in thousands):
|
2013 |
|
|
2012 |
|
||
Beginning of period |
$ |
146,478 |
|
|
$ |
84,810 |
|
Liabilities incurred |
|
8,731 |
|
|
|
9,802 |
|
Liabilities settled |
|
(424) |
|
|
|
(3,649 |
) |
Disposition of wells |
|
(3,129 |
) |
|
|
(1,457 |
) |
Accretion expense |
|
10,778 |
|
|
|
8,793 |
|
Change in estimate |
|
67,643 |
|
|
|
48,179 |
|
End of period |
|
230,077 |
|
|
|
146,478 |
|
Less current portion |
|
(5,037 |
) |
|
|
(2,470 |
) |
Long-term asset retirement obligations |
$ |
225,040 |
|
|
$ |
144,008 |
|