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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Cash flows from operating activities: |  |  |
Net income (loss) |  | $ (9,850) | $ 89,105
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation, depletion, amortization and impairment |  | 357,306 | 300,748
Dry holes and abandonments |  | 114 | 321
Deferred income tax benefit |  | (40,225) | (9,768)
Stock-based compensation expense |  | 13,831 | 12,959
Net gain on asset disposals | [1] | (5,914) | (4,835)
Changes in operating assets and liabilities: |  |  |
Accounts receivable |  | 330,176 | (56,963)
Income taxes receivable/payable |  | 93,527 | (13,473)
Inventory and other assets |  | 12,077 | (21,896)
Accounts payable |  | (108,424) | 50,012
Accrued expenses |  | (1,894) | 12,122
Other liabilities |  | (63) | 1,847
Net cash provided by operating activities |  | 640,661 | 360,179
Cash flows from investing activities: |  |  |
Purchases of property and equipment and acquisitions |  | (463,633) | (488,038)
Proceeds from disposal of assets |  | 10,728 | 14,991
Net cash used in investing activities |  | (452,905) | (473,047)
Cash flows from financing activities: |  |  |
Purchases of treasury stock |  | (8,010) | (13,554)
Dividends paid |  | (29,352) | (29,018)
Tax benefit related to stock-based compensation |  | 1,129 | 8,556
Debt issuance costs |  | (1,979) |
Proceeds from long-term debt |  | 200,000 |
Repayment of long-term debt |  | (10,000) | (5,000)
Proceeds from borrowings under revolving credit facility |  | 54,000 |
Repayment of borrowings under revolving credit facility |  | (357,000) |
Proceeds from exercise of stock options |  |  | 22,265
Net cash used in financing activities |  | (151,212) | (16,751)
Effect of foreign exchange rate changes on cash |  | (3,050) | 947
Net increase (decrease) in cash and cash equivalents |  | 33,494 | (128,672)
Cash and cash equivalents at beginning of period |  | 43,012 | 249,509
Cash and cash equivalents at end of period |  | 76,506 | 120,837
Net cash (paid) received during the period for: |  |  |
Interest, net of capitalized interest of $3,343 in 2015 and $3,326 in 2014 |  | (16,506) | (13,360)
Income taxes |  | 63,740 | (54,089)
Non-cash investing and financing activities: |  |  |
Net (decrease) increase in payables for purchase of property and equipment |  | (50,487) | 96,143
Net decrease (increase) in deposits on equipment purchases |  | $ 64,638 | $ (25,558)
[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 cash inflow from a debt initially having maturity due after one year or beyond the 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 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 cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 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 cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: 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 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=56944662&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 cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=56944662&loc=d3e3291-108585 + 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=56944662&loc=d3e3602-108585 + Details
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