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Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 214,385 | $ 167,088 | $ 6,613 | $ 93,897
Accounts receivable—oil and gas | 30,798 | 25,615 |  |
Accounts receivable-related parties | 36,823 | 34,848 |  |
Accounts receivable - intercompany |  |  |  |
Prepaid expenses and other current assets | 2,639 | 1,506 |  |
Deferred tax asset | 372 | 0 |  |
Short-term derivative instruments | 863 | 664 |  |
Total current assets | 285,880 | 229,721 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 2,065,918 | 1,611,090 |  |
Other property and equipment | 9,017 | 8,662 |  |
Accumulated depletion, depreciation, amortization and impairment | (717,007) | (665,884) |  |
Property and equipment, net | 1,357,928 | 953,868 |  |
Other assets: |  |  |  |
Equity investments | 438,864 | 381,484 |  |
Other assets | 13,153 | 13,295 |  |
Total other assets | 452,017 | 394,779 |  |
Deferred tax asset |  | 0 |  |
Total assets | 2,095,825 | 1,578,368 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 142,375 | 110,244 |  |
Accounts payable - intercompany | 0 |  |  |
Asset retirement obligation—current | 780 | 60 | 60 |
Short-term derivative instruments | 1,839 | 10,442 |  |
Current maturities of long-term debt | 154 | 150 |  |
Total current liabilities | 145,148 | 120,896 |  |
Asset retirement obligation—long-term | 13,231 | 13,215 | 13,120 |
Deferred tax liability | 69,204 | 18,607 |  |
Long-term debt, net of current maturities | 298,956 | 298,888 |  |
Other non-current liabilities | 0 | 354 |  |
Total liabilities | 526,539 | 451,960 |  |
Stockholders’ equity: |  |  |  |
Common stock | 775 | 674 |  |
Paid-in capital | 1,398,188 | 1,036,245 |  |
Accumulated other comprehensive income (loss) | (10,982) | (3,429) |  |
Retained earnings (accumulated deficit) | 181,305 | 92,918 |  |
Total stockholders’ equity | 1,569,286 | 1,126,408 | 692,714 | 632,350
Total liabilities and stockholders’ equity | 2,095,825 | 1,578,368 |  |
Parent [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 213,390 | 165,293 | 6,261 | 93,124
Accounts receivable—oil and gas | 30,288 | 25,070 |  |
Accounts receivable-related parties | 35,432 | 33,806 |  |
Accounts receivable - intercompany | 15,254 | 15,368 |  |
Prepaid expenses and other current assets | 2,639 | 1,506 |  |
Deferred tax asset | 372 |  |  |
Short-term derivative instruments | 863 | 664 |  |
Total current assets | 298,238 | 241,707 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 2,060,274 | 1,606,172 |  |
Other property and equipment | 8,988 | 8,642 |  |
Accumulated depletion, depreciation, amortization and impairment | (716,986) | (665,864) |  |
Property and equipment, net | 1,352,276 | 948,950 |  |
Other assets: |  |  |  |
Equity investments | 431,865 | 374,209 |  |
Other assets | 13,153 | 13,295 |  |
Total other assets | 445,018 | 387,504 |  |
Deferred tax asset |  | 0 |  |
Total assets | 2,095,532 | 1,578,161 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 142,082 | 110,037 |  |
Accounts payable - intercompany | 0 | 0 |  |
Asset retirement obligation—current | 780 | 60 |  |
Short-term derivative instruments | 1,839 | 10,442 |  |
Current maturities of long-term debt | 154 | 150 |  |
Total current liabilities | 144,855 | 120,689 |  |
Asset retirement obligation—long-term | 13,231 | 13,215 |  |
Deferred tax liability | 69,204 | 18,607 |  |
Long-term debt, net of current maturities | 298,956 | 298,888 |  |
Other non-current liabilities |  | 354 |  |
Total liabilities | 526,246 | 451,753 |  |
Stockholders’ equity: |  |  |  |
Common stock | 775 | 674 |  |
Paid-in capital | 1,398,188 | 1,036,245 |  |
Accumulated other comprehensive income (loss) | (10,982) | (3,429) |  |
Retained earnings (accumulated deficit) | 181,305 | 92,918 |  |
Total stockholders’ equity | 1,569,286 | 1,126,408 |  |
Total liabilities and stockholders’ equity | 2,095,532 | 1,578,161 |  |
Guarantor [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 995 | 1,795 | 351 | 772
Accounts receivable—oil and gas | 510 | 545 |  |
Accounts receivable-related parties | 1,391 | 1,042 |  |
Accounts receivable - intercompany |  |  |  |
Prepaid expenses and other current assets |  | 0 |  |
Deferred tax asset | 0 |  |  |
Short-term derivative instruments |  | 0 |  |
Total current assets | 2,896 | 3,382 |  |
Property and equipment: |  |  |  |
Oil and natural gas properties, full-cost accounting | 5,644 | 4,918 |  |
Other property and equipment | 29 | 20 |  |
Accumulated depletion, depreciation, amortization and impairment | (21) | (20) |  |
Property and equipment, net | 5,652 | 4,918 |  |
Other assets: |  |  |  |
Equity investments |  |  |  |
Other assets |  |  |  |
Total other assets |  |  |  |
Deferred tax asset |  | 0 |  |
Total assets | 8,548 | 8,300 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities | 293 | 207 |  |
Accounts payable - intercompany | 15,144 | 15,259 |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments |  | 0 |  |
Current maturities of long-term debt |  | 0 |  |
Total current liabilities | 15,437 | 15,466 |  |
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 | 15,437 | 15,466 |  |
Stockholders’ equity: |  |  |  |
Common stock |  |  |  |
Paid-in capital | 322 | 322 |  |
Accumulated other comprehensive income (loss) |  |  |  |
Retained earnings (accumulated deficit) | (7,211) | (7,488) |  |
Total stockholders’ equity | (6,889) | (7,166) |  |
Total liabilities and stockholders’ equity | 8,548 | 8,300 |  |
Non-Guarantor [Member] |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 | 0 | 1 | 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 |  |
Total current assets |  |  |  |
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 |  |  |  |
Other assets: |  |  |  |
Equity investments | 176,877 | 172,766 |  |
Other assets |  |  |  |
Total other assets | 176,877 | 172,766 |  |
Deferred tax asset |  | 0 |  |
Total assets | 176,877 | 172,766 |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  |  |
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 |  |
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 |  |  |  |
Paid-in capital | 189,403 | 174,348 |  |
Accumulated other comprehensive income (loss) | (7,238) | 2,442 |  |
Retained earnings (accumulated deficit) | (5,398) | (4,133) |  |
Total stockholders’ equity | 176,767 | 172,657 |  |
Total liabilities and stockholders’ equity | 176,877 | 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 | (15,254) | (15,368) |  |
Prepaid expenses and other current assets |  | 0 |  |
Deferred tax asset | 0 |  |  |
Short-term derivative instruments |  | 0 |  |
Total current assets | (15,254) | (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 |  |  |  |
Other assets: |  |  |  |
Equity investments | (169,878) | (165,491) |  |
Other assets |  |  |  |
Total other assets | (169,878) | (165,491) |  |
Deferred tax asset |  | 0 |  |
Total assets | (185,132) | (180,859) |  |
Current liabilities: |  |  |  |
Accounts payable and accrued liabilities |  |  |  |
Accounts payable - intercompany | (15,254) | (15,368) |  |
Asset retirement obligation—current |  | 0 |  |
Short-term derivative instruments |  | 0 |  |
Current maturities of long-term debt |  | 0 |  |
Total current liabilities | (15,254) | (15,368) |  |
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 | (15,254) | (15,368) |  |
Stockholders’ equity: |  |  |  |
Common stock |  |  |  |
Paid-in capital | (189,725) | (174,670) |  |
Accumulated other comprehensive income (loss) | 7,238 | (2,442) |  |
Retained earnings (accumulated deficit) | 12,609 | 11,621 |  |
Total stockholders’ equity | (169,878) | (165,491) |  |
Total liabilities and stockholders’ equity | $ (185,132) | $ (180,859) |  |

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