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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, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Class of Stock [Line Items]        
Proceeds from issuance of tangible equity units, net of issuance costs | $   $ 0 $ 64,959 $ 0
Minimum settlement rate 4.4456      
Market value greater or equal to | $ / shares $ 11.247      
Maximum settlement rate 5.1124      
Market value less than or equal to | $ / shares $ 9.78      
Tangible equity units settled   1,244,743    
Issuance of shares of voting common stock   5,533,629    
Tangible equity units outstanding   135,257    
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017        
Class of Stock [Line Items]        
Tangible equity units issued during period, shares 1,380,000      
Tangible equity units issued to underwriter during period, shares 180,000      
Proceeds from issuance of tangible equity units, net of issuance costs | $ $ 65,000      
Tangible equity units, convertible, conversion ratio 10.604556      
Stated interest rate 7.50%      
Equal quarterly cash installments per Amortizing Note 1.00      
Installment payment due on August 15, 2014 per Amortizing Note 0.933333      
Tangible equity units dividend rate 8.00%      
Tangible equity units, price per share | $ / shares $ 50.00      
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Notes Payable        
Class of Stock [Line Items]        
Long-term debt | $   $ 7,500 $ 12,000