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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, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Class of Stock [Line Items]          
Proceeds from issuance of tangible equity units, net of issuance costs | $     $ 0 $ 64,959  
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     1,193,693    
Tangible equity units outstanding     186,307    
Long term debt, net | $     $ 262,779   $ 93,569
Common Stock | Class A Common Stock          
Class of Stock [Line Items]          
Issuance of shares of voting common stock 70,690   5,306,682    
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 | Long Term Debt          
Class of Stock [Line Items]          
Long term debt, net | $     $ 8,700