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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, 2018
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  
Common Stock | Class A Common Stock      
Class of Stock [Line Items]      
Issuance of shares of voting common stock (in shares) | 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) | shares   1,380,000  
Tangible equity units issued to underwriter during period (in 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