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STOCKHOLDERS' EQUITY - Perpetual Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended
--- | --- | ---
Apr. 08, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Class of Stock [Line Items] |  |  |
Net proceeds from issuance of preferred stock |  | $ 110,873 | $ 0
Underwriters option period | 30 days |  |
Series D Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Stock Issued During the Period, Depositary Shares | 4,000,000 |  |
Non cumulative preferred stock, dividend rate | 7.375% | 7.375% |
Preferred stock, liquidation preference per share | $ 1,000 | $ 1,000 |
Price per share of depository shares (in usd per share) | $ 25 |  |
Depository shares to preferred stock ratio | 2.50% |  |
Net proceeds from issuance of preferred stock | $ 96,900 |  |
Preferred Stock, Capital Shares Reserved for Future Issuance | 600,000 |  |
Series D Preferred Stock | Over Allotment Option |  |  |
Class of Stock [Line Items] |  |  |
Net proceeds from issuance of preferred stock | $ 14,500 |  |
Underwriters option period | 30 days |  |

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- Definition Aggregate number of nonredeemable preferred shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 + Details
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