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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Cash flows from operating activities: |  |  |  |
Net income | $ 56,230 |  | $ 97,274 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation, depletion, amortization and impairment | 136,435 |  | 122,953 |
Provision for bad debts |  |  | 1,600 |
Dry holes and abandonments | 10 |  | 56 |
Deferred income tax expense | 24,555 |  | 48,407 |
Stock-based compensation expense | 5,903 |  | 5,458 |
Net (gain) loss on asset disposals | 125 | [1] | (2,400) | [1]
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable | (25,220) |  | (38,109) |
Income taxes receivable/payable | 1,267 |  | 5,807 |
Inventory and other assets | 6,672 |  | 5,332 |
Accounts payable | 21,385 |  | 30,418 |
Accrued expenses | (17,698) |  | (12,234) |
Other liabilities | 53 |  | (897) |
Net cash provided by operating activities | 209,717 |  | 263,665 |
Cash flows from investing activities: |  |  |  |
Purchase of property and equipment | (174,161) |  | (263,403) |
Proceeds from disposal of assets | 707 |  | 4,651 |
Net cash used in investing activities | (173,454) |  | (258,752) |
Cash flows from financing activities: |  |  |  |
Purchase of treasury stock | (15,201) |  | (15) |
Dividends paid | (7,312) |  | (7,788) |
Tax benefit related to stock-based compensation | 2,737 |  | 166 |
Repayment of long-term debt | (1,250) |  | (2,500) |
Proceeds from borrowing under revolving credit facility |  |  | 54,500 |
Repayment of borrowing under revolving credit facility |  |  | (56,000) |
Proceeds from exercise of stock options | 18,622 |  | 195 |
Net cash used in financing activities | (2,404) |  | (11,442) |
Effect of foreign exchange rate changes on cash | (551) |  | 408 |
Net increase (decrease) in cash and cash equivalents | 33,308 |  | (6,121) |
Cash and cash equivalents at beginning of period | 110,723 |  | 23,946 |
Cash and cash equivalents at end of period | 144,031 |  | 17,825 |
Net cash paid during the period for: |  |  |  |
Interest, net of capitalized interest of $2,281 in 2013 and $1,968 in 2012 |  |  | (364) |
Income taxes | (3,543) |  | (1,390) |
Supplemental investing and financing information: |  |  |  |
Net increase in current liabilities for purchase of property and equipment | 24,039 |  | 2,553 |
Net decrease in deposits on equipment purchases | $ 7,863 |  | $ 1,900 |
[1] | Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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