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STOCKHOLDERS' EQUITY - Tangible Equity Units (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Aug. 03, 2015
shares
May 21, 2014
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
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    
Tangible equity units outstanding     0  
Long term debt, net | $     $ 172,865 $ 175,378
Common Stock | Class A Common Stock        
Class of Stock [Line Items]        
Issuance of shares of voting common stock (in shares) 70,690   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 (in shares)   1,380,000    
Tangible equity units issued to underwriter during period (in 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 (in dollars per share) | $ / shares   $ 50.00    
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 | Long Term Debt        
Class of Stock [Line Items]        
Long term debt, net | $     $ 0 $ 2,700