The following is a summary of property, plant and equipment at the dates indicated (in thousands):
|
|
|
December 31, |
|
|
Estimated Useful Lives |
|||||
|
|
|
2015 |
|
|
2014 |
|
|
in Years |
||
|
Natural gas and oil properties: |
|
|
|
|
|
|
|
|
|
|
|
Proved properties: |
|
|
|
|
|
|
|
|
|
|
|
Leasehold interests |
|
$ |
569,377 |
|
|
$ |
455,401 |
|
|
|
|
Pre-development costs |
|
6,529 |
|
|
|
7,378 |
|
|
|
|
|
Wells and related equipment |
|
3,157,708 |
|
|
|
3,082,429 |
|
|
|
|
|
Total proved properties |
|
3,733,614 |
|
|
|
3,545,208 |
|
|
|
|
|
Unproved properties |
|
213,047 |
|
|
|
311,946 |
|
|
|
|
|
Support equipment |
|
44,921 |
|
|
|
37,359 |
|
|
|
|
|
Total natural gas and oil properties |
|
3,991,582 |
|
|
|
3,894,513 |
|
|
|
|
|
Pipelines, processing and compression facilities |
|
59,733 |
|
|
|
49,547 |
|
|
15 – 20 |
|
|
Rights of way |
|
829 |
|
|
|
830 |
|
|
20 – 40 |
|
|
Land, buildings and improvements |
|
9,798 |
|
|
|
9,160 |
|
|
3 – 40 |
|
|
Other |
|
18,405 |
|
|
|
17,936 |
|
|
3 – 10 |
|
|
|
|
4,080,347 |
|
|
|
3,971,986 |
|
|
|
|
|
Less – accumulated depreciation, depletion and amortization |
|
(2,763,450 |
) |
|
|
(1,552,697 |
) |
|
|
|
|
|
|
$ |
1,316,897 |
|
|
$ |
2,419,289 |
|
|
|