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CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, shares authorized (in shares) | 92,150,000 |  | 92,150,000 | 75,950,000 |
Preferred Stock, shares issued (in shares) | 87,200,000 |  | 87,200,000 | 73,400,000 |
Preferred Stock, shares outstanding (in shares) | 87,200,000 |  | 87,200,000 | 73,400,000 |
Preferred Stock, carrying value | $ 2,110,346 |  | $ 2,110,346 | $ 1,778,168 | [1]
Series C Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, shares authorized (in shares) | 7,000,000 |  | 7,000,000 | 7,000,000 |
Preferred Stock, shares issued (in shares) | 7,000,000 |  | 7,000,000 | 7,000,000 |
Preferred Stock, shares outstanding (in shares) | 7,000,000 |  | 7,000,000 | 7,000,000 |
Preferred Stock, carrying value | $ 169,466 |  | $ 169,466 | $ 169,466 |
Preferred Stock, contractual rate |  | 7.625% | 7.625% |  |
Series D Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, shares authorized (in shares) | 18,400,000 |  | 18,400,000 | 18,400,000 |
Preferred Stock, shares issued (in shares) | 18,400,000 |  | 18,400,000 | 18,400,000 |
Preferred Stock, shares outstanding (in shares) | 18,400,000 |  | 18,400,000 | 18,400,000 |
Preferred Stock, carrying value | $ 445,457 |  | $ 445,457 | $ 445,457 |
Preferred Stock, contractual rate |  |  | 7.50% |  |
Series H Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, shares authorized (in shares) | 0 |  | 0 | 2,200,000 |
Preferred Stock, shares issued (in shares) | 0 |  | 0 | 2,200,000 |
Preferred Stock, shares outstanding (in shares) | 0 |  | 0 | 2,200,000 |
Preferred Stock, carrying value | $ 0 |  | $ 0 | $ 55,000 |
Preferred Stock, contractual rate | 8.125% |  | 8.125% |  |
Series F Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, shares authorized (in shares) | 28,800,000 |  | 28,800,000 | 28,800,000 |
Preferred Stock, shares issued (in shares) | 28,800,000 |  | 28,800,000 | 28,800,000 |
Preferred Stock, shares outstanding (in shares) | 28,800,000 |  | 28,800,000 | 28,800,000 |
Preferred Stock, carrying value | $ 696,910 |  | $ 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 | 19,550,000 |
Preferred Stock, shares issued (in shares) | 17,000,000 | 17,000,000.0 | 17,000,000 | 17,000,000 |
Preferred Stock, shares outstanding (in shares) | 17,000,000 |  | 17,000,000 | 17,000,000 |
Preferred Stock, carrying value | $ 411,335 |  | $ 411,335 | $ 411,335 |
Preferred Stock, contractual rate |  | 6.50% | 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 | 0 |
Preferred Stock, shares issued (in shares) | 16,000,000.0 |  | 16,000,000.0 | 0 |
Preferred Stock, shares outstanding (in shares) | 16,000,000 |  | 16,000,000 | 0 |
Preferred Stock, carrying value | $ 387,178 |  | $ 387,178 | $ 0 |
Preferred Stock, contractual rate | 6.75% |  | 6.75% |  |
Preferred Stock, floating annual rate |  |  | 4.989% |  |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.

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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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