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CONSOLIDATED STATEMENTS OF CASH FLOWS (in thousands) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |  |  |  |
Net income (loss) |  | $ 508,407 | $ (160,843) |  | $ (757,744) |
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |  |  |
Net (gain) loss on divestiture activity |  | (426,917) | 131,028 |  | (37,074) |
Depletion, depreciation, amortization, and asset retirement obligation liability accretion |  | 665,313 | 557,036 |  | 790,745 |
Impairment of proved properties |  | 0 | 3,806 |  | 354,614 |
Abandonment and impairment of unproved properties |  | 49,889 | 12,272 |  | 80,367 |
Stock-based compensation expense |  | 23,908 | 22,700 |  | 26,897 |
Net derivative (gain) loss |  | (161,832) | 26,414 |  | 250,633 |
Derivative settlement gain (loss) |  | (135,803) | 21,234 |  | 329,478 |
Amortization of debt discount and deferred financing costs |  | 15,258 | 16,276 |  | 9,938 |
(Gain) loss on extinguishment of debt |  | 26,740 | 35 |  | (15,722) |
Deferred income taxes |  | 141,708 | (192,066) |  | (448,643) |
Other, net |  | 287 | 7,885 |  | (9,931) |
Changes in current assets and liabilities: |  |  |  |  |  |
Accounts receivable |  | (30,152) | 13,997 |  | (10,562) |
Prepaid expenses and other |  | (729) | (1,953) |  | 8,478 |
Accounts payable and accrued expenses |  | 23,819 | 44,985 |  | (53,210) |
Accrued derivative settlements |  | 20,733 | 12,584 |  | 34,540 |
Net cash provided by operating activities |  | 720,629 | 515,390 |  | 552,804 |
Cash flows from investing activities: |  |  |  |  |  |
Net proceeds from the sale of oil and gas properties |  | 748,509 | 776,719 |  | 946,062 |
Capital expenditures |  | (1,303,188) | (888,353) |  | (629,911) |
Acquisition of proved and unproved oil and gas properties |  | (33,255) | (89,896) |  | (2,183,790) |
Net cash used in investing activities |  | (587,934) | (201,530) |  | (1,867,639) |
Cash flows from financing activities: |  |  |  |  |  |
Proceeds from credit facility |  | 0 | 406,000 |  | 947,000 |
Repayment of credit facility |  | 0 | (406,000) |  | (1,149,000) |
Net proceeds from Senior Notes |  | 492,079 | 0 |  | 491,640 |
Cash paid to repurchase senior notes, including premium |  | (845,002) | (2,357) |  | (29,904) |
Net proceeds from Senior Convertible Notes |  | 0 | 0 |  | 166,617 |
Cash paid for capped call transactions |  | 0 | 0 |  | (24,195) |
Net proceeds from sale of common stock |  | 3,187 | 2,623 |  | 938,268 |
Dividends paid |  | (11,191) | (11,144) |  | (7,751) |
Other, net |  | (7,746) | (1,411) |  | (5,486) |
Net cash provided by (used in) financing activities |  | (368,673) | (12,289) |  | 1,327,189 |
Net change in cash, cash equivalents, and restricted cash |  | (235,978) | 301,571 |  | 12,354 | [1]
Cash, cash equivalents, and restricted cash at beginning of period |  | 313,943 | 12,372 | [1] | 18 | [1]
Cash, cash equivalents, and restricted cash at end of period |  | 77,965 | 313,943 |  | 12,372 | [1]
Supplemental Cash Flow Information - Operating Activities [Abstract] |  |  |  |  |  |
Cash paid for interest, net of capitalized interest |  | (150,727) | (164,097) |  | (129,761) |
Net cash (refunded) paid for income taxes |  | 2,995 | 5,986 |  | (4,690) |
Supplemental Cash Flow Information - Investing Activities [Abstract] |  |  |  |  |  |
Changes in capital expenditure accruals and other |  | (2,774) | 7,309 |  | 8,044 |
Supplemental Cash Flow Information - Non-Cash Investing Activities [Abstract] |  |  |  |  |  |
Carrying value of properties exchanged |  | 95,121 |  |  | 733 |
Supplemental Cash Flow Information - Non-Cash Financing Activities [Abstract] |  |  |  |  |  |
Issuance of common stock for an asset acquisition | [2] | 0 | 0 |  | 437,194 |
Non-cash (gain) loss on extinguishment of debt, net |  | $ 6,334 | $ 22 |  | $ (15,722) |
[1] | (1) Cash, cash equivalents, and restricted cash for the year ended December 31, 2016, includes $3.0 million of restricted cash which is included in other noncurrent assets on the accompanying balance sheets.
[2] | (1) Refer to Note 3 – Divestitures, Assets Held for Sale, and Acquisitions and Note 13 – Equity for additional discussion.

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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 net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), 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 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + 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 to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties 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 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas). + 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 from the additional capital contribution to the entity. + 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 Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + 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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