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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |  |  |  |
Net income | $ 299,477 |  | $ 322,413 |  | $ 116,942 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Depreciation, depletion, amortization and impairment | 526,614 |  | 437,279 |  | 333,493 |
Provision for bad debts | 1,100 |  |  |  | (2,000) |
Dry holes and abandonments | 308 |  | 1,213 |  | 519 |
Deferred income tax expense | 160,436 |  | 158,967 |  | 147,490 |
Stock-based compensation expense | 23,185 |  | 20,904 |  | 16,779 |
Net gain on asset disposals | (33,806) | [1] | (4,999) | [1] | (22,812) | [1]
Tax expense related to stock-based compensation | (1,284) |  |  |  | (2,291) |
Changes in operating assets and liabilities: |  |  |  |  |  |
Accounts receivable | 52,612 |  | (183,165) |  | (178,444) |
Income taxes receivable/payable | 3,506 |  | 77,618 |  | 43,522 |
Inventory and other assets | 5,276 |  | (13,491) |  | (8,772) |
Accounts payable | (25,199) |  | 41,995 |  | 49,576 |
Accrued expenses | (6,048) |  | 18,313 |  | 18,072 |
Other liabilities | (837) |  | (8,111) |  | 3,234 |
Net cash provided by (used in) operating activities of discontinued operations |  |  | (339) |  | 10,390 |
Net cash provided by operating activities | 1,005,340 |  | 868,597 |  | 525,698 |
Cash flows from investing activities: |  |  |  |  |  |
Acquisitions |  |  |  |  | (238,022) |
Purchases of property and equipment | (973,988) |  | (1,011,578) |  | (738,090) |
Proceeds from disposal of assets | 66,027 |  | 22,495 |  | 29,409 |
Net cash provided by investing activities of discontinued operations |  |  | 25,500 |  | 42,638 |
Net cash used in investing activities | (907,961) |  | (963,583) |  | (904,065) |
Cash flows from financing activities: |  |  |  |  |  |
Purchases of treasury stock | (170,292) |  | (4,314) |  | (1,853) |
Dividends paid | (30,302) |  | (31,045) |  | (30,796) |
Tax benefit related to stock-based compensation |  |  | 6,393 |  |  |
Proceeds from long-term debt | 400,000 |  |  |  | 400,000 |
Repayment of long-term debt | (93,750) |  | (6,250) |  | (1,250) |
Proceeds from borrowings under revolving credit facility | 123,400 |  | 153,100 |  | 200,000 |
Repayment of borrowings under revolving credit facility | (233,400) |  | (43,100) |  | (200,000) |
Debt issuance costs | (7,581) |  |  |  | (10,779) |
Proceeds from exercise of stock options | 934 |  | 16,811 |  | 525 |
Net cash provided by (used in) financing activities | (10,991) |  | 91,595 |  | 355,847 |
Effect of foreign exchange rate changes on cash | 389 |  | (275) |  | 255 |
Net increase (decrease) in cash and cash equivalents | 86,777 |  | (3,666) |  | (22,265) |
Cash and cash equivalents at beginning of year | 23,946 |  | 27,612 |  | 49,877 |
Cash and cash equivalents at end of year | 110,723 |  | 23,946 |  | 27,612 |
Net cash (paid) received during the year for: |  |  |  |  |  |
Interest, net of capitalized interest of $8,673 in 2012, $8,415 in 2011 and $2,288 in 2010 | (16,651) |  | (13,177) |  | (2,220) |
Income taxes | (7,964) |  | 59,251 |  | 115,666 |
Non-cash investing and financing activities: |  |  |  |  |  |
Net increase (decrease) in payables for purchases of property and equipment | (27,838) |  | 37,838 |  | 29,188 |
Net (increase) decrease in deposits on equipment purchases | $ 55,767 |  | $ (48,459) |  | $ (50,170) |
[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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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration