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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income (loss) | $ (321,421) | $ 5,910 | $ (318,634)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation, depletion, amortization and impairment | 916,318 | 783,341 | 668,434
Impairment of goodwill | 211,129 |  |
Dry holes and abandonments | 915 | 1,929 | 58
Deferred income tax benefit | (41,185) | (330,346) | (152,160)
Stock-based compensation expense | 37,925 | 44,483 | 28,324
Net gain on asset disposals | (28,958) | (33,510) | (14,771)
Tax expense related to stock-based compensation |  |  | (4,868)
Amortization of debt discount and issuance costs | 830 | 346 | 2,270
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 23,515 | (239,482) | 72,327
Income taxes receivable/payable | (1,555) | 990 | 30,379
Inventory and other assets | (1,470) | (23,449) | 5,664
Accounts payable | (69,453) | 104,072 | 12,024
Accrued expenses | 4,136 | (14,190) | (24,573)
Other liabilities | (56) | 617 | 560
Net cash provided by operating activities | 730,670 | 300,711 | 305,034
Cash flows from investing activities: |  |  |
Acquisitions, net of cash acquired | (14,211) | (501,954) | 155
Purchases of property and equipment | (641,458) | (567,087) | (119,799)
Proceeds from disposal of assets | 47,357 | 60,945 | 21,889
Collection of note receivable | 23,760 |  |
Other investments |  | (2,520) |
Net cash used in investing activities | (584,552) | (1,010,616) | (97,755)
Cash flows from financing activities: |  |  |
Proceeds from equity offering |  | 471,570 |
Purchases of treasury stock | (161,737) | (6,809) | (3,610)
Dividends paid | (30,589) | (16,315) | (23,579)
Proceeds from long-term debt | 521,194 |  |
Repayment of long-term debt |  |  | (255,000)
Proceeds from borrowings under revolving credit facility | 79,000 | 599,000 | 200,500
Repayment of borrowings under revolving credit facility | (347,000) | (331,000) | (200,500)
Debt issuance costs | (4,489) |  | (3,357)
Proceeds from exercise of stock options | 485 | 123 | 268
Net cash provided by (used in) financing activities | 56,864 | 716,569 | (285,278)
Effect of foreign exchange rate changes on cash | (781) | 1,012 | (195)
Net increase (decrease) in cash and cash equivalents | 202,201 | 7,676 | (78,194)
Cash and cash equivalents at beginning of year | 42,828 | 35,152 | 113,346
Cash and cash equivalents at end of year | 245,029 | 42,828 | 35,152
Net cash (paid) received during the year for: |  |  |
Interest, net of capitalized interest of $1,435 in 2018, $1,175 in 2017 and $398 in 2016 | (41,184) | (34,953) | (36,551)
Income taxes | 3,172 | 3,947 | 52,716
Non-cash investing and financing activities: |  |  |
Receivable from property and equipment insurance | 15,000 |  |
Net increase in payables for purchases of property and equipment | 36,241 | 17,228 | 28,926
Issuance of common stock for business acquisitions | 2,932 | 1,226,890 | 6,733
Net decrease (increase) in deposits on equipment purchases | $ 4,311 | $ (301) | $ 6,317

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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