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Condensed Consolidating Financial Information (Tables) | 3 Months Ended
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Mar. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Schedule of Condensed Consolidating Balance Sheet | Condensed Consolidating Balance Sheet (In thousands, except share data)
|  | March 31, 2013 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 81,836 |  |  | $ | 84,153 |  |  | $ | — |  |  | $ | 165,989 |
Short-term investments |  |  | 25,891 |  |  |  | — |  |  |  | — |  |  |  | 25,891 |
Accounts receivable – oil and gas revenues |  |  | — |  |  |  | 132,069 |  |  |  | — |  |  |  | 132,069 |
Accounts receivable – joint interest partners |  |  | — |  |  |  | 80,826 |  |  |  | — |  |  |  | 80,826 |
Accounts receivable – from affiliates |  |  | 299 |  |  |  | 6,222 |  |  |  | (6,521 | ) |  |  | — |
Inventory |  |  | — |  |  |  | 25,406 |  |  |  | — |  |  |  | 25,406 |
Prepaid expenses |  |  | 156 |  |  |  | 1,266 |  |  |  | — |  |  |  | 1,422 |
Advances to joint interest partners |  |  | — |  |  |  | 2,126 |  |  |  | — |  |  |  | 2,126 |
Derivative instruments |  |  | — |  |  |  | 5,647 |  |  |  | — |  |  |  | 5,647 |
Other current assets |  |  | 574 |  |  |  | 560 |  |  |  | — |  |  |  | 1,134 |
Total current assets |  |  | 108,756 |  |  |  | 338,275 |  |  |  | (6,521 | ) |  |  | 440,510 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas properties (successful efforts method) |  |  | — |  |  |  | 2,487,198 |  |  |  | — |  |  |  | 2,487,198 |
Other property and equipment |  |  | — |  |  |  | 136,676 |  |  |  | — |  |  |  | 136,676 |
Less: accumulated depreciation, depletion, amortization and impairment |  |  | — |  |  |  | (446,666 | ) |  |  | — |  |  |  | (446,666 | )
Total property, plant and equipment, net |  |  | — |  |  |  | 2,177,208 |  |  |  | — |  |  |  | 2,177,208 |
Investments in and advances to subsidiaries |  |  | 1,896,635 |  |  |  | — |  |  |  | (1,896,635 | ) |  |  | — |
Derivative instruments |  |  | — |  |  |  | 5,284 |  |  |  | — |  |  |  | 5,284 |
Deferred income taxes |  |  | 51,372 |  |  |  | — |  |  |  | (51,372 | ) |  |  | — |
Deferred costs and other assets |  |  | 20,103 |  |  |  | 3,613 |  |  |  | — |  |  |  | 23,716 |
Total assets |  | $ | 2,076,866 |  |  | $ | 2,524,380 |  |  | $ | (1,954,528 | ) |  | $ | 2,646,718 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | $ | 2 |  |  | $ | 23,558 |  |  | $ | — |  |  | $ | 23,560 |
Accounts payable – from affiliates |  |  | 6,222 |  |  |  | 299 |  |  |  | (6,521 | ) |  |  | — |
Advances from joint interest partners |  |  | — |  |  |  | 19,485 |  |  |  | — |  |  |  | 19,485 |
Revenues and production taxes payable |  |  | — |  |  |  | 90,372 |  |  |  | — |  |  |  | 90,372 |
Accrued liabilities |  |  | 63 |  |  |  | 197,263 |  |  |  | — |  |  |  | 197,326 |
Accrued interest payable |  |  | 21,472 |  |  |  | 16 |  |  |  | — |  |  |  | 21,488 |
Derivative instruments |  |  | — |  |  |  | 4,660 |  |  |  | — |  |  |  | 4,660 |
Total current liabilities |  |  | 27,759 |  |  |  | 335,653 |  |  |  | (6,521 | ) |  |  | 356,891 |
Long-term debt |  |  | 1,200,000 |  |  |  | — |  |  |  | — |  |  |  | 1,200,000 |
Asset retirement obligations |  |  | — |  |  |  | 25,029 |  |  |  | — |  |  |  | 25,029 |
Deferred income taxes |  |  | — |  |  |  | 265,155 |  |  |  | (51,372 | ) |  |  | 213,783 |
Other liabilities |  |  | — |  |  |  | 1,908 |  |  |  | — |  |  |  | 1,908 |
Total liabilities |  |  | 1,227,759 |  |  |  | 627,745 |  |  |  | (57,893 | ) |  |  | 1,797,611 |
Stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from affiliates |  |  | — |  |  |  | 1,610,162 |  |  |  | (1,610,162 | ) |  |  | — |
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,730,917 issued and 93,596,984 outstanding |  |  | 925 |  |  |  | — |  |  |  | — |  |  |  | 925 |
Treasury stock, at cost; 133,933 shares |  |  | (3,952 | ) |  |  | — |  |  |  | — |  |  |  | (3,952 | )
Additional paid-in-capital |  |  | 660,350 |  |  |  | 8,743 |  |  |  | (8,743 | ) |  |  | 660,350 |
Retained earnings |  |  | 191,784 |  |  |  | 277,730 |  |  |  | (277,730 | ) |  |  | 191,784 |
Total stockholders’ equity |  |  | 849,107 |  |  |  | 1,896,635 |  |  |  | (1,896,635 | ) |  |  | 849,107 |
Total liabilities and stockholders’ equity |  | $ | 2,076,866 |  |  | $ | 2,524,380 |  |  | $ | (1,954,528 | ) |  | $ | 2,646,718 |
Condensed Consolidating Balance Sheet (In thousands, except share data)
|  | December 31, 2012 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 133,797 |  |  | $ | 79,650 |  |  | $ | — |  |  | $ | 213,447 |
Short-term investments |  |  | 25,891 |  |  |  | — |  |  |  | — |  |  |  | 25,891 |
Accounts receivable – oil and gas revenues |  |  | — |  |  |  | 110,341 |  |  |  | — |  |  |  | 110,341 |
Accounts receivable – joint interest partners |  |  | — |  |  |  | 99,194 |  |  |  | — |  |  |  | 99,194 |
Accounts receivable – from affiliates |  |  | 310 |  |  |  | 5,845 |  |  |  | (6,155 | ) |  |  |  |
Inventory |  |  | — |  |  |  | 20,707 |  |  |  | — |  |  |  | 20,707 |
Prepaid expenses |  |  | 313 |  |  |  | 1,457 |  |  |  | — |  |  |  | 1,770 |
Advances to joint interest partners |  |  | — |  |  |  | 1,985 |  |  |  | — |  |  |  | 1,985 |
Derivative instruments |  |  | — |  |  |  | 19,016 |  |  |  | — |  |  |  | 19,016 |
Other current assets |  |  | 235 |  |  |  | 100 |  |  |  | — |  |  |  | 335 |
Total current assets |  |  | 160,546 |  |  |  | 338,295 |  |  |  | (6,155 | ) |  |  | 492,686 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas properties (successful efforts method) |  |  | — |  |  |  | 2,348,128 |  |  |  | — |  |  |  | 2,348,128 |
Other property and equipment |  |  | — |  |  |  | 49,732 |  |  |  | — |  |  |  | 49,732 |
Less: accumulated depreciation, depletion, amortization and impairment |  |  | — |  |  |  | (391,260 | ) |  |  | — |  |  |  | (391,260 | )
Total property, plant and equipment, net |  |  | — |  |  |  | 2,006,600 |  |  |  | — |  |  |  | 2,006,600 |
Investments in and advances to subsidiaries |  |  | 1,807,010 |  |  |  | — |  |  |  | (1,807,010 | ) |  |  | — |
Derivative instruments |  |  | — |  |  |  | 4,981 |  |  |  | — |  |  |  | 4,981 |
Deferred income taxes |  |  | 42,746 |  |  |  | — |  |  |  | (42,746 | ) |  |  | — |
Deferred costs and other assets |  |  | 20,748 |  |  |  | 3,779 |  |  |  | — |  |  |  | 24,527 |
Total assets |  | $ | 2,031,050 |  |  | $ | 2,353,655 |  |  | $ | (1,855,911 | ) |  | $ | 2,528,794 |
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | $ | 9 |  |  | $ | 12,482 |  |  | $ | — |  |  | $ | 12,491 |
Accounts payable – from affiliates |  |  | 5,845 |  |  |  | 310 |  |  |  | (6,155 | ) |  |  |  |
Advances from joint interest partners |  |  | — |  |  |  | 21,176 |  |  |  | — |  |  |  | 21,176 |
Revenues and production taxes payable |  |  | — |  |  |  | 71,553 |  |  |  | — |  |  |  | 71,553 |
Accrued liabilities |  |  | 100 |  |  |  | 189,763 |  |  |  | — |  |  |  | 189,863 |
Accrued interest payable |  |  | 30,091 |  |  |  | 5 |  |  |  | — |  |  |  | 30,096 |
Derivative instruments |  |  | — |  |  |  | 1,048 |  |  |  | — |  |  |  | 1,048 |
Deferred income taxes |  |  | — |  |  |  | 4,558 |  |  |  | — |  |  |  | 4,558 |
Total current liabilities |  |  | 36,045 |  |  |  | 300,895 |  |  |  | (6,155 | ) |  |  | 330,785 |
Long-term debt |  |  | 1,200,000 |  |  |  | — |  |  |  | — |  |  |  | 1,200,000 |
Asset retirement obligations |  |  | — |  |  |  | 22,956 |  |  |  | — |  |  |  | 22,956 |
Derivative instruments |  |  | — |  |  |  | 380 |  |  |  | — |  |  |  | 380 |
Deferred income taxes |  |  | — |  |  |  | 220,417 |  |  |  | (42,746 | ) |  |  | 177,671 |
Other liabilities |  |  | — |  |  |  | 1,997 |  |  |  | — |  |  |  | 1,997 |
Total liabilities |  |  | 1,236,045 |  |  |  | 546,645 |  |  |  | (48,901 | ) |  |  | 1,733,789 |
Stockholders’ equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions from affiliates |  |  | — |  |  |  | 1,586,780 |  |  |  | (1,586,780 | ) |  |  | — |
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,432,712 issued and 93,303,298 outstanding |  |  | 925 |  |  |  | — |  |  |  | — |  |  |  | 925 |
Treasury stock, at cost; 129,414 shares |  |  | (3,796 | ) |  |  | — |  |  |  | — |  |  |  | (3,796 | )
Additional paid-in-capital |  |  | 657,943 |  |  |  | 8,743 |  |  |  | (8,743 | ) |  |  | 657,943 |
Retained earnings |  |  | 139,933 |  |  |  | 211,487 |  |  |  | (211,487 | ) |  |  | 139,933 |
Total stockholders’ equity |  |  | 795,005 |  |  |  | 1,807,010 |  |  |  | (1,807,010 | ) |  |  | 795,005 |
Total liabilities and stockholders’ equity |  | $ | 2,031,050 |  |  | $ | 2,353,655 |  |  | $ | (1,855,911 | ) |  | $ | 2,528,794 |
Schedule of Condensed Consolidating Statement of Operations | Condensed Consolidating Statement of Operations (In thousands)
|  | Three Months Ended March 31, 2013 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas revenues |  | $ | — |  |  | $ | 241,651 |  |  | $ | — |  |  | $ | 241,651 |
Well services and midstream revenues |  |  | — |  |  |  | 6,653 |  |  |  | — |  |  |  | 6,653 |
Total revenues |  |  | — |  |  |  | 248,304 |  |  |  | — |  |  |  | 248,304 |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  | — |  |  |  | 19,489 |  |  |  | — |  |  |  | 19,489 |
Well services and midstream operating expenses |  |  | — |  |  |  | 2,914 |  |  |  | — |  |  |  | 2,914 |
Marketing, transportation and gathering expenses |  |  | — |  |  |  | 3,389 |  |  |  | — |  |  |  | 3,389 |
Production taxes |  |  | — |  |  |  | 22,089 |  |  |  | — |  |  |  | 22,089 |
Depreciation, depletion and amortization |  |  | — |  |  |  | 66,261 |  |  |  | — |  |  |  | 66,261 |
Exploration expenses |  |  | — |  |  |  | 1,857 |  |  |  | — |  |  |  | 1,857 |
Impairment of oil and gas properties |  |  | — |  |  |  | 498 |  |  |  | — |  |  |  | 498 |
General and administrative expenses |  |  | 2,876 |  |  |  | 10,978 |  |  |  | — |  |  |  | 13,854 |
Total expenses |  |  | 2,876 |  |  |  | 127,475 |  |  |  | — |  |  |  | 130,351 |
Operating income (loss) |  |  | (2,876 | ) |  |  | 120,829 |  |  |  | — |  |  |  | 117,953 |
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings in subsidiaries |  |  | 66,243 |  |  |  | — |  |  |  | (66,243 | ) |  |  | — |
Net loss on derivative instruments |  |  | — |  |  |  | (14,612 | ) |  |  | — |  |  |  | (14,612 | )
Interest expense, net of capitalized interest |  |  | (20,518 | ) |  |  | (665 | ) |  |  | — |  |  |  | (21,183 | )
Other income |  |  | 376 |  |  |  | 404 |  |  |  | — |  |  |  | 780 |
Total other income (expense) |  |  | 46,101 |  |  |  | (14,873 | ) |  |  | (66,243 | ) |  |  | (35,015 | )
Income before income taxes |  |  | 43,225 |  |  |  | 105,956 |  |  |  | (66,243 | ) |  |  | 82,938 |
Income tax benefit (expense) |  |  | 8,626 |  |  |  | (39,713 | ) |  |  | — |  |  |  | (31,087 | )
Net income |  | $ | 51,851 |  |  | $ | 66,243 |  |  | $ | (66,243 | ) |  | $ | 51,851 |
Condensed Consolidating Statement of Operations (In thousands)
|  | Three Months Ended March 31, 2012 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas revenues |  | $ | — |  |  | $ | 137,906 |  |  | $ | — |  |  | $ | 137,906 |
Well services revenues |  |  | — |  |  |  | 660 |  |  |  | — |  |  |  | 660 |
Total revenues |  |  | — |  |  |  | 138,566 |  |  |  | — |  |  |  | 138,566 |
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease operating expenses |  |  | — |  |  |  | 9,816 |  |  |  | — |  |  |  | 9,816 |
Well services operating expenses |  |  | — |  |  |  | 477 |  |  |  | — |  |  |  | 477 |
Marketing, transportation and gathering expenses |  |  | — |  |  |  | 2,569 |  |  |  | — |  |  |  | 2,569 |
Production taxes |  |  | — |  |  |  | 13,266 |  |  |  | — |  |  |  | 13,266 |
Depreciation, depletion and amortization |  |  | — |  |  |  | 38,886 |  |  |  | — |  |  |  | 38,886 |
Exploration expenses |  |  | — |  |  |  | 2,835 |  |  |  | — |  |  |  | 2,835 |
Impairment of oil and gas properties |  |  | — |  |  |  | 368 |  |  |  | — |  |  |  | 368 |
General and administrative expenses |  |  | 2,449 |  |  |  | 9,750 |  |  |  | — |  |  |  | 12,199 |
Total expenses |  |  | 2,449 |  |  |  | 77,967 |  |  |  | — |  |  |  | 80,416 |
Operating income (loss) |  |  | (2,449 | ) |  |  | 60,599 |  |  |  | — |  |  |  | 58,150 |
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings in subsidiaries |  |  | 26,264 |  |  |  | — |  |  |  | (26,264 | ) |  |  | — |
Net loss on derivative instruments |  |  | — |  |  |  | (18,586 | ) |  |  | — |  |  |  | (18,586 | )
Interest expense, net of capitalized interest |  |  | (13,414 | ) |  |  | (485 | ) |  |  | — |  |  |  | (13,899 | )
Other income |  |  | 177 |  |  |  | 421 |  |  |  | — |  |  |  | 598 |
Total other income (expense) |  |  | 13,027 |  |  |  | (18,650 | ) |  |  | (26,264 | ) |  |  | (31,887 | )
Income before income taxes |  |  | 10,578 |  |  |  | 41,949 |  |  |  | (26,264 | ) |  |  | 26,263 |
Income tax benefit (expense) |  |  | 5,863 |  |  |  | (15,685 | ) |  |  | — |  |  |  | (9,822 | )
Net income |  | $ | 16,441 |  |  | $ | 26,264 |  |  | $ | (26,264 | ) |  | $ | 16,441 |
Schedule of Condensed Consolidating Statement of Cash Flows | Condensed Consolidating Statement of Cash Flows (In thousands)
|  | Three Months Ended March 31, 2013 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
Cash flows from operating activities: |  | $ | 51,851 |  |  | $ | 66,243 |  |  | $ | (66,243 | ) |  | $ | 51,851 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  | (66,243 | ) |  |  | — |  |  |  | 66,243 |  |  |  | — |
Depreciation, depletion and amortization |  |  | — |  |  |  | 66,261 |  |  |  | — |  |  |  | 66,261 |
Impairment of oil and gas properties |  |  | — |  |  |  | 498 |  |  |  | — |  |  |  | 498 |
Deferred income taxes |  |  | (8,626 | ) |  |  | 39,613 |  |  |  | — |  |  |  | 30,987 |
Derivative instruments |  |  | — |  |  |  | 14,612 |  |  |  | — |  |  |  | 14,612 |
Stock-based compensation expenses |  |  | 2,278 |  |  |  | 11 |  |  |  | — |  |  |  | 2,289 |
Debt discount amortization and other |  |  | 644 |  |  |  | 102 |  |  |  | — |  |  |  | 746 |
Working capital and other changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounts receivable |  |  | 11 |  |  |  | (3,740 | ) |  |  | 369 |  |  |  | (3,360 | )
Change in inventory |  |  | — |  |  |  | (8,407 | ) |  |  | — |  |  |  | (8,407 | )
Change in prepaid expenses |  |  | 157 |  |  |  | 136 |  |  |  | — |  |  |  | 293 |
Change in other current assets |  |  | (339 | ) |  |  | 107 |  |  |  | — |  |  |  | (232 | )
Change in accounts payable and accrued liabilities |  |  | (8,286 | ) |  |  | 23,664 |  |  |  | (369 | ) |  |  | 15,009 |
Net cash provided by (used in) operating activities |  |  | (28,553 | ) |  |  | 199,100 |  |  |  | — |  |  |  | 170,547 |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  | — |  |  |  | (217,678 | ) |  |  | — |  |  |  | (217,678 | )
Derivative settlements |  |  | — |  |  |  | 1,686 |  |  |  | — |  |  |  | 1,686 |
Advances to joint interest partners |  |  | — |  |  |  | (141 | ) |  |  | — |  |  |  | (141 | )
Advances from joint interest partners |  |  | — |  |  |  | (1,691 | ) |  |  | — |  |  |  | (1,691 | )
Net cash used in investing activities |  |  | — |  |  |  | (217,824 | ) |  |  | — |  |  |  | (217,824 | )
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock |  |  | (156 | ) |  |  | — |  |  |  | — |  |  |  | (156 | )
Debt issuance costs |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | (25 | )
Investment in / capital contributions from affiliates |  |  | (23,252 | ) |  |  | 23,252 |  |  |  | — |  |  |  | — |
Net cash provided by (used in) financing activities |  |  | (23,408 | ) |  |  | 23,227 |  |  |  | — |  |  |  | (181 | )
Increase (decrease) in cash and cash equivalents |  |  | (51,961 | ) |  |  | 4,503 |  |  |  | — |  |  |  | (47,458 | )
Cash and cash equivalents at beginning of period |  |  | 133,797 |  |  |  | 79,650 |  |  |  | — |  |  |  | 213,447 |
Cash and cash equivalents at end of period |  | $ | 81,836 |  |  | $ | 84,153 |  |  | $ | — |  |  | $ | 165,989 |
Condensed Consolidating Statement of Cash Flows (In thousands)
|  | Three Months Ended March 31, 2012 |
|  | Parent/ Issuer |  |  | Combined Guarantor Subsidiaries |  |  | Intercompany Eliminations |  |  | Consolidated |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 16,441 |  |  | $ | 26,264 |  |  | $ | (26,264 | ) |  | $ | 16,441 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  | (26,264 | ) |  |  | — |  |  |  | 26,264 |  |  |  | — |
Depreciation, depletion and amortization |  |  | — |  |  |  | 38,886 |  |  |  | — |  |  |  | 38,886 |
Impairment of oil and gas properties |  |  | — |  |  |  | 368 |  |  |  | — |  |  |  | 368 |
Deferred income taxes |  |  | (5,863 | ) |  |  | 15,685 |  |  |  | — |  |  |  | 9,822 |
Derivative instruments |  |  | — |  |  |  | 18,586 |  |  |  | — |  |  |  | 18,586 |
Stock-based compensation expenses |  |  | 1,591 |  |  |  | — |  |  |  | — |  |  |  | 1,591 |
Debt discount amortization and other |  |  | 480 |  |  |  | 168 |  |  |  | — |  |  |  | 648 |
Working capital and other changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounts receivable |  |  | — |  |  |  | (27,768 | ) |  |  | 1,730 |  |  |  | (26,038 | )
Change in inventory |  |  | — |  |  |  | (9,641 | ) |  |  | — |  |  |  | (9,641 | )
Change in prepaid expenses |  |  | 155 |  |  |  | (124 | ) |  |  | — |  |  |  | 31 |
Change in other current assets |  |  | 10 |  |  |  | 473 |  |  |  | — |  |  |  | 483 |
Change in accounts payable and accrued liabilities |  |  | 904 |  |  |  | 11,601 |  |  |  | (1,730 | ) |  |  | 10,775 |
Change in other current liabilities |  |  | — |  |  |  | (188 | ) |  |  | — |  |  |  | (188 | )
Change in other liabilities |  |  | — |  |  |  | 1,001 |  |  |  | — |  |  |  | 1,001 |
Net cash provided by (used in) operating activities |  |  | (12,546 | ) |  |  | 75,311 |  |  |  | — |  |  |  | 62,765 |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  | — |  |  |  | (269,975 | ) |  |  | — |  |  |  | (269,975 | )
Derivative settlements |  |  | — |  |  |  | (1,291 | ) |  |  | — |  |  |  | (1,291 | )
Redemptions of short-term investments |  |  | 19,994 |  |  |  | — |  |  |  | — |  |  |  | 19,994 |
Advances to joint interest partners |  |  | — |  |  |  | 655 |  |  |  | — |  |  |  | 655 |
Advances from joint interest partners |  |  | — |  |  |  | 5,484 |  |  |  | — |  |  |  | 5,484 |
Net cash provided by (used in) investing activities |  |  | 19,994 |  |  |  | (265,127 | ) |  |  | — |  |  |  | (245,133 | )
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock |  |  | (1,181 | ) |  |  | — |  |  |  | — |  |  |  | (1,181 | )
Debt issuance costs |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | (25 | )
Investment in / capital contributions from affiliates |  |  | (156,315 | ) |  |  | 156,315 |  |  |  | — |  |  |  | — |
Net cash provided by (used in) financing activities |  |  | (157,496 | ) |  |  | 156,290 |  |  |  | — |  |  |  | (1,206 | )
Decrease in cash and cash equivalents |  |  | (150,048 | ) |  |  | (33,526 | ) |  |  | — |  |  |  | (183,574 | )
Cash and cash equivalents at beginning of period |  |  | 443,482 |  |  |  | 27,390 |  |  |  | — |  |  |  | 470,872 |
Cash and cash equivalents at end of period |  | $ | 293,434 |  |  | $ | (6,136 | ) |  | $ | — |  |  | $ | 287,298 |

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