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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Carrying Value | $ 184,878 | $ 189,825
Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, authorized (in shares) | 50,000,000 | 197,106
Preferred stock, shares outstanding (in shares) | 191,972 | 197,106
Liquidation Preference | $ 191,972 | $ 197,106
Carrying Value | $ 184,878 | $ 189,825
Preferred Stock | Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Non cumulative preferred stock, dividend rate (percent) | 7.375% | 7.375%
Preferred stock, authorized (in shares) |  | 96,629
Preferred stock, shares outstanding (in shares) | 93,270 | 96,629
Liquidation Preference | $ 93,270 | $ 96,629
Carrying Value | $ 89,922 | $ 93,162
Preferred Stock | Series E Preferred Stock |  |
Class of Stock [Line Items] |  |
Non cumulative preferred stock, dividend rate (percent) | 7.00% | 7.00%
Preferred stock, authorized (in shares) |  | 100,477
Preferred stock, shares outstanding (in shares) | 98,702 | 100,477
Liquidation Preference | $ 98,702 | $ 100,477
Carrying Value | $ 94,956 | $ 96,663

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