|
Supplemental Information On Oil And Gas Exploration And Production Activities (Tables)
|
12 Months Ended |
|
Dec. 31, 2011
|
| Supplemental Information On Oil And Gas Exploration And Production Activities [Abstract] |
|
| Capitalized Costs Related To Oil And Gas Producing Activities |
| |
|
|
|
|
|
|
|
|
| |
|
2011 |
|
|
2010 |
|
|
Proven properties
|
|
$ |
897,130,000 |
|
|
$ |
730,566,000 |
|
|
Unproven properties
|
|
|
132,912,000 |
|
|
|
11,756,000 |
|
| |
|
|
|
|
|
|
|
|
| |
|
|
1,030,042,000 |
|
|
|
742,322,000 |
|
|
Accumulated depreciation, depletion, amortization and impairment reserve
|
|
|
(571,213,000 |
) |
|
|
(509,248,000 |
) |
| |
|
|
|
|
|
|
|
|
|
Net capitalized costs
|
|
$ |
458,829,000 |
|
|
$ |
233,074,000 |
|
| |
|
|
|
|
|
|
|
|
|
| Costs Incurred In Oil And Gas Property Acquisition And Development Activities |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
2011 |
|
|
2010 |
|
|
2009 |
|
|
Acquisition
|
|
$ |
119,522,000 |
|
|
$ |
17,627,000 |
|
|
$ |
1,885,000 |
|
|
Development of proved undeveloped properties
|
|
|
123,489,000 |
|
|
|
64,652,000 |
|
|
|
28,652,000 |
|
|
Exploratory
|
|
|
3,994,000 |
|
|
|
— |
|
|
|
502,000 |
|
|
Recompletions
|
|
|
17,259,000 |
|
|
|
16,917,000 |
|
|
|
8,980,000 |
|
|
Capitalized asset retirement obligation
|
|
|
1,390,000 |
|
|
|
1,328,000 |
|
|
|
361,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
265,654,000 |
|
|
$ |
100,524,000 |
|
|
$ |
40,380,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Results Of Operations For Producing Activities |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
2011 |
|
|
2010 |
|
|
2009 |
|
|
Revenues
|
|
$ |
228,953,000 |
|
|
$ |
127,636,000 |
|
|
$ |
85,576,000 |
|
|
Production costs
|
|
|
(47,230,000 |
) |
|
|
(31,580,000 |
) |
|
|
(26,113,000 |
) |
|
Depletion
|
|
|
(61,965,000 |
) |
|
|
(38,600,000 |
) |
|
|
(28,939,000 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
119,758,000 |
|
|
|
57,456,000 |
|
|
|
30,524,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Income tax expense (benefit)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Current
|
|
|
282,000 |
|
|
|
40,000 |
|
|
|
28,000 |
|
|
Deferred
|
|
|
(372,000 |
) |
|
|
— |
|
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
(90,000 |
) |
|
|
40,000 |
|
|
|
28,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Results of operations from producing activities
|
|
$ |
119,848,000 |
|
|
$ |
57,416,000 |
|
|
$ |
30,496,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Depletion per barrel of oil equivalent (BOE)
|
|
$ |
26.56 |
|
|
$ |
19.54 |
|
|
$ |
17.25 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Oil And Gas Reserves |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
2011 |
|
|
2010 |
|
|
2009 |
|
| |
|
Oil |
|
|
Gas |
|
|
Oil |
|
|
Gas |
|
|
Oil |
|
|
Gas |
|
|
Proved Reserves
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Beginning of the period
|
|
|
19,704 |
|
|
|
16,158 |
|
|
|
17,488 |
|
|
|
14,332 |
|
|
|
21,771 |
|
|
|
22,235 |
|
|
Purchases in oil and gas reserves in place
|
|
|
2 |
|
|
|
19 |
|
|
|
3,913 |
|
|
|
3,482 |
|
|
|
1,728 |
|
|
|
1,135 |
|
|
Extensions and discoveries
|
|
|
3,940 |
|
|
|
2,091 |
|
|
|
5,574 |
|
|
|
5,303 |
|
|
|
2,614 |
|
|
|
2,874 |
|
|
Sales of oil and gas reserves in place
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
(736 |
) |
|
|
(282 |
) |
|
Revisions of prior reserve estimates
|
|
|
(4,714 |
) |
|
|
(1,662 |
) |
|
|
(5,426 |
) |
|
|
(6,171 |
) |
|
|
(6,294 |
) |
|
|
(11,139 |
) |
|
Current production
|
|
|
(2,187 |
) |
|
|
(878 |
) |
|
|
(1,845 |
) |
|
|
(788 |
) |
|
|
(1,595 |
) |
|
|
(491 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
End of period
|
|
|
16,745 |
|
|
|
15,728 |
|
|
|
19,704 |
|
|
|
16,158 |
|
|
|
17,488 |
|
|
|
14,332 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Proved developed reserves
|
|
|
7,485 |
|
|
|
6,152 |
|
|
|
7,230 |
|
|
|
6,068 |
|
|
|
6,165 |
|
|
|
4,325 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Proved undeveloped reserves
|
|
|
9,260 |
|
|
|
9,576 |
|
|
|
12,474 |
|
|
|
10,090 |
|
|
|
11,323 |
|
|
|
10,007 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Year ended December 31, |
|
| |
|
2011 |
|
|
2010 |
|
|
2009 |
|
|
Future cash flows
|
|
$ |
1,594,050,000 |
|
|
$ |
1,479,295,000 |
|
|
$ |
1,005,029,000 |
|
|
Future development and abandonment costs
|
|
|
(306,810,000 |
) |
|
|
(301,651,000 |
) |
|
|
(209,975,000 |
) |
|
Future production costs
|
|
|
(295,383,000 |
) |
|
|
(305,814,000 |
) |
|
|
(236,003,000 |
) |
|
Future production taxes
|
|
|
(124,739,000 |
) |
|
|
(136,323,000 |
) |
|
|
(97,841,000 |
) |
|
Future income taxes
|
|
|
(229,649,000 |
) |
|
|
(159,171,000 |
) |
|
|
(50,229,000 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Future net cash flows
|
|
|
637,469,000 |
|
|
|
576,336,000 |
|
|
|
410,981,000 |
|
|
10% discount to reflect timing of cash flows
|
|
|
(260,788,000 |
) |
|
|
(260,849,000 |
) |
|
|
(170,207,000 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Standardized measure of discounted future net cash flows
|
|
$ |
376,681,000 |
|
|
$ |
315,487,000 |
|
|
$ |
240,774,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
| Changes In Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Year ended December 31, |
|
| |
|
2011 |
|
|
2010 |
|
|
2009 |
|
|
Sales and transfers of oil and gas produced, net of production costs
|
|
$ |
(181,723,000 |
) |
|
$ |
(96,056,000 |
) |
|
$ |
(59,463,000 |
) |
|
Net changes in prices, production costs, and development costs
|
|
|
136,071,000 |
|
|
|
122,147,000 |
|
|
|
183,426,000 |
|
|
Acquisition of oil and gas reserves in place
|
|
|
72,000 |
|
|
|
63,043,000 |
|
|
|
20,981,000 |
|
|
Extensions and discoveries
|
|
|
107,110,000 |
|
|
|
88,227,000 |
|
|
|
32,638,000 |
|
|
Revisions of previous quantity estimates, less related production costs
|
|
|
(112,553,000 |
) |
|
|
(89,155,000 |
) |
|
|
(77,531,000 |
) |
|
Sales of reserves in place
|
|
|
— |
|
|
|
— |
|
|
|
(13,185,000 |
) |
|
Accretion of discount
|
|
|
31,549,000 |
|
|
|
24,077,000 |
|
|
|
12,624,000 |
|
|
Net changes in income taxes
|
|
|
(36,674,000 |
) |
|
|
(54,879,000 |
) |
|
|
(22,238,000 |
) |
|
Change in production rates and other
|
|
|
117,342,000 |
|
|
|
17,309,000 |
|
|
|
37,282,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
Total change in standardized measure of discounted future net cash flows
|
|
$ |
61,194,000 |
|
|
$ |
74,713,000 |
|
|
$ |
114,534,000 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|