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CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |
Shares Authorized (in shares) | 85,150,000 |  | 85,150,000 |
Shares Issued (in shares) | 81,900,000 |  | 81,900,000 |
Shares Outstanding (in shares) | 81,900,000 |  | 81,900,000 |
Carrying Value | $ 1,982,026 |  | $ 1,982,026 | [1]
Series D |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Authorized (in shares) | 18,400,000 |  | 18,400,000 |
Shares Issued (in shares) | 18,400,000 |  | 18,400,000 |
Shares Outstanding (in shares) | 18,400,000 |  | 18,400,000 |
Carrying Value | $ 445,457 |  | $ 445,457 |
Contractual Rate | 7.50% |  |  |
Series F |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Authorized (in shares) | 28,800,000 |  | 28,800,000 |
Shares Issued (in shares) | 28,800,000 |  | 28,800,000 |
Shares Outstanding (in shares) | 28,800,000 |  | 28,800,000 |
Carrying Value | $ 696,910 |  | $ 696,910 |
Contractual Rate | 6.95% |  |  |
Floating annual rate | 4.993% |  |  |
Series G |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Authorized (in shares) | 19,550,000 |  | 19,550,000 |
Shares Issued (in shares) | 17,000,000 |  | 17,000,000 |
Shares Outstanding (in shares) | 17,000,000 |  | 17,000,000 |
Carrying Value | $ 411,335 |  | $ 411,335 |
Contractual Rate | 6.50% |  |  |
Floating annual rate | 4.172% |  |  |
Series I |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares Authorized (in shares) | 18,400,000 |  | 18,400,000 |
Shares Issued (in shares) | 17,700,000 | 16,000,000.0 | 17,700,000 |
Shares Outstanding (in shares) | 17,700,000 |  | 17,700,000 |
Carrying Value | $ 428,324 |  | $ 428,324 |
Contractual Rate | 6.75% | 6.75% |  |
Floating annual rate | 4.989% |  |  |
[1] | Derived from the audited consolidated financial statements at December 31, 2019.

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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 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=6877327&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=6877327&loc=d3e13212-122682 + Details
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