Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified
|
Sep. 30, 2013
|
Dec. 31, 2012
|
Sep. 30, 2012
|
Dec. 31, 2011
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
$ 95,466 |
$ 167,088 |
$ 12,280 |
$ 93,897 |
Accounts receivable—oil and gas |
47,673 |
25,615 |
|
|
Accounts receivable-related parties |
29,797 |
34,848 |
|
|
Accounts receivable - intercompany |
|
0 |
|
|
Prepaid expenses and other current assets |
4,634 |
1,506 |
|
|
Deferred tax asset |
787 |
0 |
|
|
Short-term derivative instruments |
1,633 |
664 |
|
|
Note receivable - related party |
875 |
0 |
|
|
Total current assets |
180,865 |
229,721 |
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
2,253,605 |
1,611,090 |
|
|
Other property and equipment |
10,164 |
8,662 |
|
|
Accumulated depletion, depreciation, amortization and impairment |
(747,698) |
(665,884) |
|
|
Property and equipment, net |
1,516,071 |
953,868 |
|
|
Other assets: |
|
|
|
|
Equity investments |
500,679 |
381,484 |
|
|
Derivative instruments |
127 |
0 |
|
|
Other assets |
12,827 |
13,295 |
|
|
Total other assets |
513,633 |
394,779 |
|
|
Total assets |
2,210,569 |
1,578,368 |
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
179,357 |
110,244 |
|
|
Accounts payable - intercompany |
0 |
0 |
|
|
Asset retirement obligation—current |
780 |
60 |
60 |
|
Short-term derivative instruments |
4,808 |
10,442 |
|
|
Current maturities of long-term debt |
156 |
150 |
|
|
Total current liabilities |
185,101 |
120,896 |
|
|
Long-term derivative instrument |
962 |
0 |
|
|
Asset retirement obligation—long-term |
13,988 |
13,215 |
13,831 |
|
Deferred tax liability |
93,957 |
18,607 |
|
|
Long-term debt, net of current maturities |
298,992 |
298,888 |
|
|
Other non-current liabilities |
0 |
354 |
|
|
Total liabilities |
593,000 |
451,960 |
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
775 |
674 |
|
|
Paid-in capital |
1,399,803 |
1,036,245 |
|
|
Accumulated other comprehensive loss |
(4,841) |
(3,429) |
|
|
Retained earnings (accumulated deficit) |
221,832 |
92,918 |
|
|
Total stockholders’ equity |
1,617,569 |
1,126,408 |
680,627 |
632,350 |
Total liabilities and stockholders’ equity |
2,210,569 |
1,578,368 |
|
|
Parent [Member]
|
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
93,996 |
165,293 |
11,677 |
93,124 |
Accounts receivable—oil and gas |
47,143 |
25,070 |
|
|
Accounts receivable-related parties |
26,421 |
33,806 |
|
|
Accounts receivable - intercompany |
18,419 |
15,368 |
|
|
Prepaid expenses and other current assets |
4,634 |
1,506 |
|
|
Deferred tax asset |
787 |
|
|
|
Short-term derivative instruments |
1,633 |
664 |
|
|
Note receivable - related party |
875 |
|
|
|
Total current assets |
193,908 |
241,707 |
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
2,247,150 |
1,606,172 |
|
|
Other property and equipment |
10,135 |
8,642 |
|
|
Accumulated depletion, depreciation, amortization and impairment |
(747,677) |
(665,864) |
|
|
Property and equipment, net |
1,509,608 |
948,950 |
|
|
Other assets: |
|
|
|
|
Equity investments |
493,860 |
374,209 |
|
|
Derivative instruments |
127 |
|
|
|
Other assets |
12,827 |
13,295 |
|
|
Total other assets |
506,814 |
387,504 |
|
|
Total assets |
2,210,330 |
1,578,161 |
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
179,118 |
110,037 |
|
|
Accounts payable - intercompany |
0 |
0 |
|
|
Asset retirement obligation—current |
780 |
60 |
|
|
Short-term derivative instruments |
4,808 |
10,442 |
|
|
Current maturities of long-term debt |
156 |
150 |
|
|
Total current liabilities |
184,862 |
120,689 |
|
|
Long-term derivative instrument |
962 |
|
|
|
Asset retirement obligation—long-term |
13,988 |
13,215 |
|
|
Deferred tax liability |
93,957 |
18,607 |
|
|
Long-term debt, net of current maturities |
298,992 |
298,888 |
|
|
Other non-current liabilities |
|
354 |
|
|
Total liabilities |
592,761 |
451,753 |
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
775 |
674 |
|
|
Paid-in capital |
1,399,803 |
1,036,245 |
|
|
Accumulated other comprehensive loss |
(4,841) |
(3,429) |
|
|
Retained earnings (accumulated deficit) |
221,832 |
92,918 |
|
|
Total stockholders’ equity |
1,617,569 |
1,126,408 |
|
|
Total liabilities and stockholders’ equity |
2,210,330 |
1,578,161 |
|
|
Guarantor [Member]
|
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
1,469 |
1,795 |
603 |
772 |
Accounts receivable—oil and gas |
530 |
545 |
|
|
Accounts receivable-related parties |
3,376 |
1,042 |
|
|
Accounts receivable - intercompany |
|
|
|
|
Prepaid expenses and other current assets |
|
0 |
|
|
Deferred tax asset |
0 |
|
|
|
Short-term derivative instruments |
|
0 |
|
|
Note receivable - related party |
0 |
|
|
|
Total current assets |
5,375 |
3,382 |
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
6,455 |
4,918 |
|
|
Other property and equipment |
29 |
20 |
|
|
Accumulated depletion, depreciation, amortization and impairment |
(21) |
(20) |
|
|
Property and equipment, net |
6,463 |
4,918 |
|
|
Other assets: |
|
|
|
|
Equity investments |
|
0 |
|
|
Derivative instruments |
0 |
|
|
|
Other assets |
|
0 |
|
|
Total other assets |
|
|
|
|
Total assets |
11,838 |
8,300 |
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
239 |
207 |
|
|
Accounts payable - intercompany |
18,309 |
15,259 |
|
|
Asset retirement obligation—current |
|
0 |
|
|
Short-term derivative instruments |
|
0 |
|
|
Current maturities of long-term debt |
|
0 |
|
|
Total current liabilities |
18,548 |
15,466 |
|
|
Long-term derivative instrument |
0 |
|
|
|
Asset retirement obligation—long-term |
0 |
0 |
|
|
Deferred tax liability |
|
0 |
|
|
Long-term debt, net of current maturities |
0 |
0 |
|
|
Other non-current liabilities |
|
0 |
|
|
Total liabilities |
18,548 |
15,466 |
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0 |
|
|
Paid-in capital |
322 |
322 |
|
|
Accumulated other comprehensive loss |
|
0 |
|
|
Retained earnings (accumulated deficit) |
(7,032) |
(7,488) |
|
|
Total stockholders’ equity |
(6,710) |
(7,166) |
|
|
Total liabilities and stockholders’ equity |
11,838 |
8,300 |
|
|
Non-Guarantor [Member]
|
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
1 |
0 |
0 |
1 |
Accounts receivable—oil and gas |
0 |
0 |
|
|
Accounts receivable-related parties |
0 |
0 |
|
|
Accounts receivable - intercompany |
0 |
|
|
|
Prepaid expenses and other current assets |
0 |
0 |
|
|
Deferred tax asset |
0 |
|
|
|
Short-term derivative instruments |
0 |
0 |
|
|
Note receivable - related party |
0 |
|
|
|
Total current assets |
1 |
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
|
0 |
|
|
Other property and equipment |
|
0 |
|
|
Accumulated depletion, depreciation, amortization and impairment |
|
0 |
|
|
Property and equipment, net |
|
0 |
|
|
Other assets: |
|
|
|
|
Equity investments |
189,942 |
172,766 |
|
|
Derivative instruments |
0 |
|
|
|
Other assets |
|
0 |
|
|
Total other assets |
189,942 |
172,766 |
|
|
Total assets |
189,943 |
172,766 |
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
|
0 |
|
|
Accounts payable - intercompany |
110 |
109 |
|
|
Asset retirement obligation—current |
|
0 |
|
|
Short-term derivative instruments |
|
0 |
|
|
Current maturities of long-term debt |
|
0 |
|
|
Total current liabilities |
110 |
109 |
|
|
Long-term derivative instrument |
0 |
|
|
|
Asset retirement obligation—long-term |
0 |
0 |
|
|
Deferred tax liability |
|
0 |
|
|
Long-term debt, net of current maturities |
0 |
0 |
|
|
Other non-current liabilities |
|
0 |
|
|
Total liabilities |
110 |
109 |
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0 |
|
|
Paid-in capital |
199,437 |
174,348 |
|
|
Accumulated other comprehensive loss |
(3,344) |
2,442 |
|
|
Retained earnings (accumulated deficit) |
(6,260) |
(4,133) |
|
|
Total stockholders’ equity |
189,833 |
172,657 |
|
|
Total liabilities and stockholders’ equity |
189,943 |
172,766 |
|
|
Eliminations [Member]
|
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
0 |
0 |
0 |
0 |
Accounts receivable—oil and gas |
|
0 |
|
|
Accounts receivable-related parties |
0 |
0 |
|
|
Accounts receivable - intercompany |
(18,419) |
(15,368) |
|
|
Prepaid expenses and other current assets |
|
0 |
|
|
Deferred tax asset |
0 |
|
|
|
Short-term derivative instruments |
|
0 |
|
|
Note receivable - related party |
0 |
|
|
|
Total current assets |
(18,419) |
(15,368) |
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
|
0 |
|
|
Other property and equipment |
|
0 |
|
|
Accumulated depletion, depreciation, amortization and impairment |
|
0 |
|
|
Property and equipment, net |
|
0 |
|
|
Other assets: |
|
|
|
|
Equity investments |
(183,123) |
(165,491) |
|
|
Derivative instruments |
0 |
|
|
|
Other assets |
|
0 |
|
|
Total other assets |
(183,123) |
(165,491) |
|
|
Total assets |
(201,542) |
(180,859) |
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
|
0 |
|
|
Accounts payable - intercompany |
(18,419) |
(15,368) |
|
|
Asset retirement obligation—current |
|
0 |
|
|
Short-term derivative instruments |
|
0 |
|
|
Current maturities of long-term debt |
|
0 |
|
|
Total current liabilities |
(18,419) |
(15,368) |
|
|
Long-term derivative instrument |
0 |
|
|
|
Asset retirement obligation—long-term |
0 |
0 |
|
|
Deferred tax liability |
|
0 |
|
|
Long-term debt, net of current maturities |
0 |
0 |
|
|
Other non-current liabilities |
|
0 |
|
|
Total liabilities |
(18,419) |
(15,368) |
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0 |
|
|
Paid-in capital |
(199,759) |
(174,670) |
|
|
Accumulated other comprehensive loss |
3,344 |
(2,442) |
|
|
Retained earnings (accumulated deficit) |
13,292 |
11,621 |
|
|
Total stockholders’ equity |
(183,123) |
(165,491) |
|
|
Total liabilities and stockholders’ equity |
$ (201,542) |
$ (180,859) |
|
|