| Net income | |
| Depreciation, depletion and amortization | |
| Impairment of property and equipment | |
| Exploration costs | |
| (Gain) loss on sales of assets and impairment of inventory, net | |
| Deferred income tax expense | |
| Non-cash employee compensation | |
| Unrealized (gain) loss on derivatives | |
| Accretion of abandonment obligations | |
| Amortization of debt issue costs | |
| Loss on early extinguishment of long-term debt | |
| Accounts receivable | |
| Accounts payable | |
| Other | |
| Net cash provided by operating activities | |
| Additions to property and equipment | |
| Proceeds from sales of assets | |
| Change in equipment inventory | |
| Other | |
| Net cash used in investing activities | |
| Proceeds from long-term debt | |
| Repayments of long-term debt | |
| Premium on early extinguishment of long-term debt | |
| Proceeds from exercise of stock options | |
| Net cash provided by (used in) financing activities | |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | |
| Beginning of period | 7.78M |
| End of period | 182.99M |
| Cash paid for interest, net of amounts capitalized | |