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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income (loss) | $ 5,910 | $ (318,634) | $ (294,486)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation, depletion, amortization and impairment | 783,341 | 668,434 | 864,759
Impairment of goodwill |  |  | 124,561
Dry holes and abandonments | 1,929 | 58 | 1,224
Deferred income tax benefit | (330,346) | (152,160) | (99,873)
Stock-based compensation expense | 44,483 | 28,324 | 28,510
Net gain on asset disposals | (33,510) | (14,771) | (10,613)
Tax expense related to stock-based compensation |  | (4,868) | (1,362)
Amortization of debt issuance costs | 346 | 2,270 | 1,245
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (239,482) | 72,327 | 440,884
Income taxes receivable/payable | 990 | 30,379 | 49,895
Inventory and other assets | (23,449) | 5,664 | 38,993
Accounts payable | 104,072 | 12,024 | (131,649)
Accrued expenses | (14,190) | (24,573) | (10,303)
Other liabilities | 617 | 560 | (2,348)
Net cash provided by operating activities | 300,711 | 305,034 | 999,437
Cash flows from investing activities: |  |  |
Acquisitions, net of cash acquired | (501,954) | 155 |
Purchases of property and equipment | (567,087) | (119,799) | (743,776)
Proceeds from disposal of assets | 60,945 | 21,889 | 20,814
Other investments | (2,520) |  |
Net cash used in investing activities | (1,010,616) | (97,755) | (722,962)
Cash flows from financing activities: |  |  |
Proceeds from equity offering | 471,570 |  |
Purchases of treasury stock | (6,809) | (3,610) | (8,010)
Dividends paid | (16,315) | (23,579) | (58,775)
Proceeds from long-term debt |  |  | 200,000
Repayment of long-term debt |  | (255,000) | (27,500)
Proceeds from borrowings under revolving credit facility | 599,000 | 200,500 | 54,000
Repayment of borrowings under revolving credit facility | (331,000) | (200,500) | (357,000)
Debt issuance costs |  | (3,357) | (1,979)
Proceeds from exercise of stock options | 123 | 268 |
Net cash provided by (used in) financing activities | 716,569 | (285,278) | (199,264)
Effect of foreign exchange rate changes on cash | 1,012 | (195) | (6,877)
Net increase (decrease) in cash and cash equivalents | 7,676 | (78,194) | 70,334
Cash and cash equivalents at beginning of year | 35,152 | 113,346 | 43,012
Cash and cash equivalents at end of year | 42,828 | 35,152 | 113,346
Net cash (paid) received during the year for: |  |  |
Interest, net of capitalized interest of $1,175 in 2017, $398 in 2016 and $6,332 in 2015 | (34,953) | (36,551) | (33,452)
Income taxes | 3,947 | 52,716 | 97,333
Non-cash investing and financing activities: |  |  |
Net increase (decrease) in payables for purchases of property and equipment | 17,228 | 28,926 | (167,308)
Issuance of common stock for business acquisition | 1,226,890 | 6,733 |
Net decrease (increase) in deposits on equipment purchases | $ (301) | $ 6,317 | $ 90,012

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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 (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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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=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + 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=98514028&loc=d3e3255-108585 + 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=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + 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 (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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=98514028&loc=d3e3291-108585 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&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=98514028&loc=d3e3602-108585 + Details
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