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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 102,561 | $ 8,540
Adjustments to reconcile net income to net cash provided by operating activities: |  |
(Income) loss from discontinued operations | (148,609) | 9,587
Gain on sale of assets | (7,958) | (53,686)
Deferred income taxes | (24,238) | (3,435)
Dry hole costs and lease impairments | 11,908 | 1,315
Impairment of oil and gas properties | 652 | 5,350
Depreciation, depletion and amortization | 170,211 | 162,986
Unrealized loss (gain) from derivatives | 8,127 | (24,610)
Debt issuance cost and discount amortization | 3,218 | 2,103
Stock-based compensation | 6,440 | 6,860
Excess income taxes related to stock-based compensation | 2,015 | 1,670
Decrease (increase) in accounts receivable | (20,760) | 17,880
Decrease (increase) in other current assets | 243 | (2,889)
Increase (decrease) in accounts payable and accrued liabilities | 11,917 | (14,283)
Net cash provided by continuing operations | 115,727 | 117,388
Net cash provided by (used for) discontinued operations | (7,715) | 24,510
Net cash provided by operating activities | 108,012 | 141,898
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Capital expenditures | (132,826) | (258,587)
Proceeds from sales of oil and gas properties |  | 121,322
Proceeds from sales of marketable securities | 13,392 | 37,705
Investing activities of continuing operations | (119,434) | (99,560)
Cash flows from investing activities of discontinued operations: |  |
Capital expenditures | (101,037) | (89,750)
Proceeds from sale of oil and gas properties | 823,701 | 24,750
Net cash provided by (used for) investing activities of discontinued operations | 722,664 | (65,000)
Net cash provided by (used for) investing activities | 603,230 | (164,560)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Borrowings | 95,000 | 390,912
Principal payments on debt | (537,225) | (365,000)
Debt issuance costs | (15) | (6,535)
Tax withholding related to stock grants | (1,680) |
Excess income taxes from stock-based compensation | (2,015) | (1,670)
Dividends paid | (6,041) |
Net cash provided by (used for) financing activities | (451,976) | 17,707
Net increase (decrease) in cash and cash equivalents | 259,266 | (4,955)
Cash and cash equivalents, beginning of period | 4,471 | 8,460
Cash and cash equivalents, end of period | $ 263,737 | $ 3,505

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