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CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Preferred Stock, shares authorized (in shares) | 85,150,000 | 85,150,000
Preferred Stock, shares issued (in shares) | 63,500,000 | 81,900,000
Preferred Stock, shares outstanding (in shares) | 63,500,000 | 81,900,000
Preferred Stock, carrying value | $ 1,536,569 | $ 1,982,026
Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred Stock, shares authorized (in shares) | 18,400,000 | 18,400,000
Preferred Stock, shares issued (in shares) | 0 | 18,400,000
Preferred Stock, shares outstanding (in shares) | 0 | 18,400,000
Preferred Stock, carrying value | $ 0 | $ 445,457
Preferred Stock, contractual rate | 7.50% |
Series F Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred Stock, shares authorized (in shares) | 28,800,000 | 28,800,000
Preferred Stock, shares issued (in shares) | 28,800,000 | 28,800,000
Preferred Stock, shares outstanding (in shares) | 28,800,000 | 28,800,000
Preferred Stock, carrying value | $ 696,910 | $ 696,910
Preferred Stock, contractual rate | 6.95% |
Preferred Stock, floating annual rate | 4.993% |
Series G Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred Stock, shares authorized (in shares) | 19,550,000 | 19,550,000
Preferred Stock, shares issued (in shares) | 17,000,000 | 17,000,000
Preferred Stock, shares outstanding (in shares) | 17,000,000 | 17,000,000
Preferred Stock, carrying value | $ 411,335 | $ 411,335
Preferred Stock, contractual rate | 6.50% |
Preferred Stock, floating annual rate | 4.172% |
Series I Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred Stock, shares authorized (in shares) | 18,400,000 | 18,400,000
Preferred Stock, shares issued (in shares) | 17,700,000 | 17,700,000
Preferred Stock, shares outstanding (in shares) | 17,700,000 | 17,700,000
Preferred Stock, carrying value | $ 428,324 | $ 428,324
Preferred Stock, contractual rate | 6.75% | 6.75%
Preferred Stock, floating annual rate | 4.989% |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: 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 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: 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 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: 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 + Details
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