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STOCKHOLDERS' EQUITY - Summary of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |
Carrying Value | $ 189,825 | $ 231,128
Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |
Preferred stock, liquidation preference per share (in dollars per share) | $ 1,000 |
Preferred stock, outstanding (in shares) | 197,106 | 240,000
Liquidation Preference | $ 197,106 | $ 240,000
Carrying Value | $ 189,825 | $ 231,128
Preferred Stock | Series D 7.375% non-cumulative perpetual |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 96,629 | 115,000
Liquidation Preference | $ 96,629 | $ 115,000
Carrying Value | $ 93,162 | $ 110,873
Non cumulative preferred stock, dividend rate | 7.375% | 7.375%
Preferred Stock | Series E 7.00% non-cumulative perpetual |  |
Class of Stock [Line Items] |  |
Preferred stock, outstanding (in shares) | 100,477 | 125,000
Liquidation Preference | $ 100,477 | $ 125,000
Carrying Value | $ 96,663 | $ 120,255
Non cumulative preferred stock, dividend rate | 7.00% | 7.00%
Maximum | Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred stock, authorized (in shares) | 50,000,000 |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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