| **Subsidiary Guarantor Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands**                                                           | Mar. 31, 2018 | Dec. 31, 2017 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Cash and cash equivalents                                                                                                                                    | $ 45,923      | $ 180,675     |
| Accounts receivable, net                                                                                                                                     | 181,025       | 197,598       |
| Fair value of derivatives                                                                                                                                    | 28,610        | 14,338        |
| Prepaid expenses and other current assets                                                                                                                    | 8,897         | 8,613         |
| Total current assets                                                                                                                                         | 264,455       | 401,224       |
| Properties and equipment, net                                                                                                                                | 4,231,257     | 3,933,467     |
| Assets held-for-sale, net                                                                                                                                    | 1,647         | 40,084        |
| Intercompany Receivables                                                                                                                                     | 0             | 0             |
| Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure                                                               | 0             | 0             |
| Other assets                                                                                                                                                 | 24,798        | 45,116        |
| Total Assets                                                                                                                                                 | 4,522,157     | 4,419,891     |
| Accounts payable                                                                                                                                             | 195,703       | 150,067       |
| Production tax liability                                                                                                                                     | 36,650        | 37,654        |
| Fair value of derivatives                                                                                                                                    | 110,683       | 79,302        |
| Funds held for distribution                                                                                                                                  | 97,611        | 95,811        |
| Accrued interest payable                                                                                                                                     | 13,760        | 11,815        |
| Other accrued expenses                                                                                                                                       | 33,777        | 42,987        |
| Total current liabilities                                                                                                                                    | 488,184       | 417,636       |
| Intercompany Payable                                                                                                                                         | 0             | 0             |
| Long-term debt                                                                                                                                               | 1,154,528     | 1,151,932     |
| Deferred income taxes                                                                                                                                        | 187,183       | 191,992       |
| Asset retirement obligations                                                                                                                                 | 73,905        | 71,006        |
| Fair value of derivatives                                                                                                                                    | 26,426        | 22,343        |
| Other liabilities                                                                                                                                            | 94,557        | 57,333        |
| Total liabilities                                                                                                                                            | 2,024,783     | 1,912,242     |
| Common shares - par value $0.01 per share, 150,000,000 authorized, 65,999,010 and 65,955,080 issued as of March 31, 2018 and December 31, 2017, respectively | 660           | 659           |
| Additional paid-in capital                                                                                                                                   | 2,504,663     | 2,503,294     |
| Retained earnings (deficit)                                                                                                                                  | (6,435)       | 6,704         |
| Treasury Stock, Value                                                                                                                                        | 1,514         | 3,008         |
| Total stockholders' equity                                                                                                                                   | 2,497,374     | 2,507,649     |
| Total Liabilities and Stockholders' Equity                                                                                                                   | 4,522,157     | 4,419,891     |
| Corporate, Non-Segment [Member]                                                                                                                              |          |          |
| Cash and cash equivalents                                                                                                                                    | 45,923        | 180,675       |
| Accounts receivable, net                                                                                                                                     | 143,250       | 160,490       |
| Fair value of derivatives                                                                                                                                    | 28,610        | 14,338        |
| Prepaid expenses and other current assets                                                                                                                    | 7,116         | 8,284         |
| Total current assets                                                                                                                                         | 224,899       | 363,787       |
| Properties and equipment, net                                                                                                                                | 2,139,471     | 1,891,314     |
| Assets held-for-sale, net                                                                                                                                    | 1,647         | 40,084        |
| Intercompany Receivables                                                                                                                                     | 294,476       | 250,279       |
| Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure                                                               | 1,605,330     | 1,617,537     |
| Other assets                                                                                                                                                 | 23,339        | 42,547        |
| Total Assets                                                                                                                                                 | 4,289,162     | 4,205,548     |
| Accounts payable                                                                                                                                             | 113,529       | 85,000        |
| Production tax liability                                                                                                                                     | 35,309        | 35,902        |
| Fair value of derivatives                                                                                                                                    | 110,683       | 79,302        |
| Funds held for distribution                                                                                                                                  | 80,203        | 83,898        |
| Accrued interest payable                                                                                                                                     | 13,756        | 11,812        |
| Other accrued expenses                                                                                                                                       | 33,136        | 42,543        |
| Total current liabilities                                                                                                                                    | 386,616       | 338,457       |
| Intercompany Payable                                                                                                                                         | 0             | 0             |
| Long-term debt                                                                                                                                               | 1,154,528     | 1,151,932     |
| Deferred income taxes                                                                                                                                        | 62,088        | 62,857        |
| Asset retirement obligations                                                                                                                                 | 67,922        | 65,301        |
| Fair value of derivatives                                                                                                                                    | 26,426        | 22,343        |
| Other liabilities                                                                                                                                            | 94,208        | 57,009        |
| Total liabilities                                                                                                                                            | 1,791,788     | 1,697,899     |
| Common shares - par value $0.01 per share, 150,000,000 authorized, 65,999,010 and 65,955,080 issued as of March 31, 2018 and December 31, 2017, respectively | 660           | 659           |
| Additional paid-in capital                                                                                                                                   | 2,504,663     | 2,503,294     |
| Retained earnings (deficit)                                                                                                                                  | (6,435)       | 6,704         |
| Treasury Stock, Value                                                                                                                                        | 1,514         | 3,008         |
| Total stockholders' equity                                                                                                                                   | 2,497,374     | 2,507,649     |
| Total Liabilities and Stockholders' Equity                                                                                                                   | 4,289,162     | 4,205,548     |
| Reportable Legal Entities [Member]                                                                                                                           |          |          |
| Cash and cash equivalents                                                                                                                                    | 0             | 0             |
| Accounts receivable, net                                                                                                                                     | 37,775        | 37,108        |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Prepaid expenses and other current assets                                                                                                                    | 1,781         | 329           |
| Total current assets                                                                                                                                         | 39,556        | 37,437        |
| Properties and equipment, net                                                                                                                                | 2,091,786     | 2,042,153     |
| Assets held-for-sale, net                                                                                                                                    | 0             | 0             |
| Intercompany Receivables                                                                                                                                     | 0             | 0             |
| Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure                                                               | 0             | 0             |
| Other assets                                                                                                                                                 | 1,459         | 2,569         |
| Total Assets                                                                                                                                                 | 2,132,801     | 2,082,159     |
| Accounts payable                                                                                                                                             | 82,174        | 65,067        |
| Production tax liability                                                                                                                                     | 1,341         | 1,752         |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Funds held for distribution                                                                                                                                  | 17,408        | 11,913        |
| Accrued interest payable                                                                                                                                     | 4             | 3             |
| Other accrued expenses                                                                                                                                       | 641           | 444           |
| Total current liabilities                                                                                                                                    | 101,568       | 79,179        |
| Intercompany Payable                                                                                                                                         | 294,476       | 250,279       |
| Long-term debt                                                                                                                                               | 0             | 0             |
| Deferred income taxes                                                                                                                                        | 125,095       | 129,135       |
| Asset retirement obligations                                                                                                                                 | 5,983         | 5,705         |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Other liabilities                                                                                                                                            | 349           | 324           |
| Total liabilities                                                                                                                                            | 527,471       | 464,622       |
| Common shares - par value $0.01 per share, 150,000,000 authorized, 65,999,010 and 65,955,080 issued as of March 31, 2018 and December 31, 2017, respectively | 0             | 0             |
| Additional paid-in capital                                                                                                                                   | 1,766,777     | 1,766,775     |
| Retained earnings (deficit)                                                                                                                                  | (161,447)     | (149,238)     |
| Treasury Stock, Value                                                                                                                                        | 0             | 0             |
| Total stockholders' equity                                                                                                                                   | 1,605,330     | 1,617,537     |
| Total Liabilities and Stockholders' Equity                                                                                                                   | 2,132,801     | 2,082,159     |
| Consolidation, Eliminations [Member]                                                                                                                         |          |          |
| Cash and cash equivalents                                                                                                                                    | 0             | 0             |
| Accounts receivable, net                                                                                                                                     | 0             | 0             |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Prepaid expenses and other current assets                                                                                                                    | 0             | 0             |
| Total current assets                                                                                                                                         | 0             | 0             |
| Properties and equipment, net                                                                                                                                | 0             | 0             |
| Assets held-for-sale, net                                                                                                                                    | 0             | 0             |
| Intercompany Receivables                                                                                                                                     | (294,476)     | (250,279)     |
| Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure                                                               | (1,605,330)   | (1,617,537)   |
| Other assets                                                                                                                                                 | 0             | 0             |
| Total Assets                                                                                                                                                 | (1,899,806)   | (1,867,816)   |
| Accounts payable                                                                                                                                             | 0             | 0             |
| Production tax liability                                                                                                                                     | 0             | 0             |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Funds held for distribution                                                                                                                                  | 0             | 0             |
| Accrued interest payable                                                                                                                                     | 0             | 0             |
| Other accrued expenses                                                                                                                                       | 0             | 0             |
| Total current liabilities                                                                                                                                    | 0             | 0             |
| Intercompany Payable                                                                                                                                         | (294,476)     | (250,279)     |
| Long-term debt                                                                                                                                               | 0             | 0             |
| Deferred income taxes                                                                                                                                        | 0             | 0             |
| Asset retirement obligations                                                                                                                                 | 0             | 0             |
| Fair value of derivatives                                                                                                                                    | 0             | 0             |
| Other liabilities                                                                                                                                            | 0             | 0             |
| Total liabilities                                                                                                                                            | (294,476)     | (250,279)     |
| Common shares - par value $0.01 per share, 150,000,000 authorized, 65,999,010 and 65,955,080 issued as of March 31, 2018 and December 31, 2017, respectively | 0             | 0             |
| Additional paid-in capital                                                                                                                                   | (1,766,777)   | (1,766,775)   |
| Retained earnings (deficit)                                                                                                                                  | 161,447       | 149,238       |
| Treasury Stock, Value                                                                                                                                        | 0             | 0             |
| Total stockholders' equity                                                                                                                                   | (1,605,330)   | (1,617,537)   |
| Total Liabilities and Stockholders' Equity                                                                                                                   | $ (1,899,806) | $ (1,867,816) |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable to investor partners and royalty owners.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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No definition available.
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Intercompany Payable
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Intercompany Receivables
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| X                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Liability payable within one year related to estimated taxes, primarily severance, ad valorem and property, to be paid to the states and counties in which we produce crude oil, natural gas and NGLs.
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No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.
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| - Definition
Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of other assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
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| - Definition
Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of liability arising from contracts that meet the criteria of being accounted for as derivative instruments, financial instrument or contract used to mitigate a specified risk (hedge), energy marketing activities (trading activities), expected to be settled after one year or beyond the normal operating cycle, if longer. Examples of energy marketing activities include, but are not limited to, trading of electricity, coal, natural gas and oil using financial instruments, including, but not limited to, forward contracts, options and swaps.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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| - Definition
Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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| - Definition
Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Oil and gas properties net of accumulated depreciation, depletion, amortization, impairment, and abandonment, carried under the successful effort method.
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| - Definition
Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
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| - Definition
Amount of noncurrent assets classified as other.
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| - Definition
Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.
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| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
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| - Definition
The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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| - Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.
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