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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 21, 2014
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Class of Stock [Line Items]    
Minimum settlement rate 4.4456  
Market value greater or equal to (in dollars per share) | $ / shares $ 11.247  
Maximum settlement rate 5.1124  
Market value less than or equal to (in dollars per share) | $ / shares $ 9.78  
Issuance of shares of voting common stock (in shares) | shares   6,134,988
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017    
Class of Stock [Line Items]    
Tangible equity units issued during period, shares | shares 1,380,000  
Tangible equity units issued to underwriter during period, shares | shares 180,000  
Proceeds from issuance of tangible equity units, net of issuance costs $ 65,000  
Fair value of debt instrument 14,600  
Adjustments to additional paid in capital, issuance of tangible equity units 54,400  
Tangible equity units issued, issuance costs 4,000  
Debt instrument, deferred finance cost 857  
Adjustments to additional paid in capital, tangible equity units issued, issuance costs $ 3,200