| EQUITY AND EARNINGS PER SHARE - Shares Issued in Public Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 1 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sep. 30, 2014 | Sep. 30, 2013 | Aug. 31, 2014
 Principals of Fortress [Member] | Aug. 31, 2014
 Manager [Member] | Aug. 31, 2014
 Underwriter [Member] | |||||||||
| Date of issuance | 2014-08 | ||||||||||||
| Number of shares issued | 83,333 | 7,654,166 | |||||||||||
| Share price | $ 26.34 | $ 25.92 | |||||||||||
| Issuance of common stock | $ 198,346 | ||||||||||||
| Proceeds from issuance of common stock | 198,671 | 962,827 | 197,900 | ||||||||||
| Options granted | 765,416 | [1] | |||||||||||
| Strike Price | $ 20.83 | [2] | $ 26.34 | [1] | |||||||||
| Grant date value | $ 1,700 | [1],[3] | |||||||||||
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- Definition Year and month of the issuance of stock transaction. No definition available. 
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- Definition The grant date fair value for share based compensation arrangement option grants in the period. No definition available. 
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- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount per share or per unit of equity securities issued by non-development stage entity. No definition available. 
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- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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