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STOCKHOLDERS' EQUITY - Preferred Stock Outstanding Information (Details) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |
Redemption notice period | 90 days |
Redemption price per share (usd per share) | $ 1,000 |
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 250,000 | 250,000
Preferred stock, dividend rate | 5.50% |
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 300,000 | 300,000
Preferred stock, dividend rate | 6.00% |
Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 300,000 | 300,000
Preferred stock, dividend rate | 6.375% |
Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 300,000 | 0
Preferred stock, dividend rate | 6.35% |
Liquidation preference per depository share (usd per share) | $ 25 |
Depository share interest percentage | 2.50% |
Depositary shares issued (in shares) | 12,000,000 |
LIBOR | Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend payment rate, basis spread on variable rate | 3.96% |
LIBOR | Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend payment rate, basis spread on variable rate | 3.003% |
LIBOR | Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend payment rate, basis spread on variable rate | 3.157% |
LIBOR | Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend payment rate, basis spread on variable rate | 3.642% |

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- Definition Preferred Stock, Depositary Shares Issued + References No definition available. + Details
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- Definition This element represents the dividend yield of a class of preferred stock. + References No definition available. + Details
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- Definition Preferred Stock, Liquidation Preference Per Depository Share + References No definition available. + Details
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- Definition Period which shares may be redeemed following a regulatory capital treatment event, in ‘PnYnMnDTnHnMnS’ format, for example, ‘P0Y0M90D’ represents the reported fact of 90 days. + References No definition available. + Details
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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 price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + 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=6877327&loc=d3e13212-122682 + Details
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