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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |  |  |
Net income | $ 89,105 |  | $ 96,998 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation, depletion, amortization and impairment | 300,748 |  | 273,617 |
Dry holes and abandonments | 321 |  | 15 |
Deferred income tax (benefit) expense | (9,768) |  | 45,748 |
Stock-based compensation expense | 12,959 |  | 12,119 |
Net gain on asset disposals | (4,835) | [1] | (908) | [1]
Changes in operating assets and liabilities: |  |  |  |
Accounts receivable | (56,963) |  | (36,025) |
Income taxes receivable/payable | (13,473) |  | (8,480) |
Inventory and other assets | (21,896) |  | (12,805) |
Accounts payable | 50,012 |  | 25,502 |
Accrued expenses | 12,122 |  | (12,453) |
Other liabilities | 1,847 |  | 15 |
Net cash provided by operating activities | 360,179 |  | 383,343 |
Cash flows from investing activities: |  |  |  |
Purchases of property and equipment and acquisitions | (488,038) |  | (332,598) |
Proceeds from disposal of assets | 14,991 |  | 4,593 |
Net cash used in investing activities | (473,047) |  | (328,005) |
Cash flows from financing activities: |  |  |  |
Purchases of treasury stock | (13,554) |  | (10,031) |
Dividends paid | (29,018) |  | (14,673) |
Tax benefit related to stock-based compensation | 8,556 |  | 4,862 |
Repayment of long-term debt | (5,000) |  | (2,500) |
Proceeds from exercise of stock options | 22,265 |  | 6,959 |
Net cash used in financing activities | (16,751) |  | (15,383) |
Effect of foreign exchange rate changes on cash | 947 |  | (1,801) |
Net increase (decrease) in cash and cash equivalents | (128,672) |  | 38,154 |
Cash and cash equivalents at beginning of period | 249,509 |  | 110,723 |
Cash and cash equivalents at end of period | 120,837 |  | 148,877 |
Net cash paid during the period for: |  |  |  |
Interest, net of capitalized interest of $3,326 in 2014 and $4,358 in 2013 | (13,360) |  | (12,686) |
Income taxes | (54,089) |  | (13,238) |
Supplemental non-cash investing and financing information: |  |  |  |
Net increase (decrease) in current liabilities for purchases of property and equipment | 96,143 |  | (16,169) |
Net (increase) decrease in deposits on equipment purchases | $ (25,558) |  | $ 13,789 |
[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 consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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