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Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of changes in common shares issued | A summary of the changes in our common shares issued for the years ended December 31, 2020, 2019 and 2018 is detailed below:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
|  | (in thousands)
Shares issued as of January 1(a) |  | 9,773 |  |  | 4,568 |  |  | 4,543 |
Common shares issued for WildHorse Merger(a)(b) |  | — |  |  | 3,587 |  |  | — |
Exchange of senior notes(a)(c) |  | — |  |  | 1,178 |  |  | — |
Exchange of convertible notes(a)(c) |  | — |  |  | 367 |  |  | — |
Exchange of preferred stock(a) |  | — |  |  | 52 |  |  | — |
Restricted stock issuances (net of forfeitures and cancellations)(a)(d) |  | 8 |  |  | 21 |  |  | 25 |
Shares issued as of December 31(a) |  | 9,781 |  |  | 9,773 |  |  | 4,568 |
___________________________________________ (a)All share information has been retroactively adjusted to reflect the 1-for-200 (1:200) reverse stock split effective April 14, 2020. See below for additional information. (b)See Note 3 for discussion of WildHorse Merger. (c)See Note 5 for discussion of debt exchanges. (d)See Note 12 for discussion of restricted stock.
Summary of preferred stock | Following is a summary of our preferred stock, including the primary conversion terms as of December 31, 2020:
Preferred Stock Series |  | Issue Date |  | Liquidation Preference per Share |  | Holder's Conversion Right |  | Conversion Rate |  | Conversion Price |  | Company's Conversion Right From |  | Company's Market Conversion Trigger(a)
5.75% cumulative convertible non-voting |  | May and June 2010 |  | $ | 1,000 |  |  | Any time |  | 0.1984 |  |  | $ | 5,039.59 |  |  | May 17, 2015 |  | $ | 6,551.46 |
5.75% (series A) cumulative convertible non-voting |  | May 2010 |  | $ | 1,000 |  |  | Any time |  | 0.1918 |  |  | $ | 5,215.02 |  |  | May 17, 2015 |  | $ | 6,779.52 |
4.50% cumulative convertible |  | September 2005 |  | $ | 100 |  |  | Any time |  | 0.0123 |  |  | $ | 8,142.99 |  |  | September 15, 2010 |  | $ | 10,585.89 |
5.00% cumulative convertible (series 2005B) |  | November 2005 |  | $ | 100 |  |  | Any time |  | 0.0139 |  |  | $ | 7,208.51 |  |  | November 15, 2010 |  | $ | 9,371.06 |
___________________________________________ (a) Convertible at the Company's option if the trading price of the Company's common stock equals or exceeds the trigger price for a specified time period or after the applicable conversion date if there are less than 250,000 shares of 4.50% or 5.00% (Series 2005B) preferred stock outstanding or 25,000 shares of 5.75% or 5.75% (Series A) preferred stock outstanding. Outstanding shares of our preferred stock for the years ended December 31, 2020, 2019 and 2018 are detailed below:
|  | 5.75% |  | 5.75% (Series A) |  | 4.50% |  | 5.00% (Series 2005B)
|  | (in thousands)
Shares outstanding as of January 1, 2020 and December 31, 2020 |  | 770 |  |  | 423 |  |  | 2,559 |  |  | 1,811 |
Shares outstanding as of January 1, 2019 |  | 770 |  |  | 463 |  |  | 2,559 |  |  | 1,811 |
Preferred stock exchanges(a) |  | — |  |  | (40) |  |  | — |  |  | — |
Shares outstanding as of December 31, 2019 |  | 770 |  |  | 423 |  |  | 2,559 |  |  | 1,811 |
Shares outstanding as of January 1, 2018 and December 31, 2018 |  | 770 |  |  | 463 |  |  | 2,559 |  |  | 1,811 |
____________________________________________ (a)During 2019, we exchanged 51,839 shares of common stock for 40,000 shares of our 5.75% (Series A) Cumulative Convertible Preferred Stock. In connection with the exchange, we recognized a loss equal to the excess of the fair value of all common stock issued in exchange for the preferred stock over the fair value of the common stock issuable pursuant to the original terms of the preferred stock. The loss of $17 million is reflected as a reduction to net income available to common stockholders for the purpose of calculating earnings per common share.
Schedule of Accumulated Other Comprehensive Income (Loss) | For the years ended December 31, 2020 and 2019, changes in accumulated other comprehensive income (loss) for cash flow hedges, net of tax, are detailed below:
|  | Years Ended December 31,
|  | 2020 |  | 2019
|  | ($ in millions)
Balance, as of January 1 |  | $ | 12 |  |  | $ | (23) |
Amounts reclassified from accumulated other comprehensive income(a) |  | 33 |  |  | 35 |
Balance, as of December 31 |  | $ | 45 |  |  | $ | 12 |
___________________________________________ (a) Net losses on cash flow hedges for commodity contracts reclassified from accumulated other comprehensive income (loss), net of tax, to oil, natural gas and NGL revenues in the consolidated statements of operations.

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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