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SHAREHOLDERS' EQUITY - Tangible Equity Units (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
May 21, 2014
May 21, 2014
Junior Subordinated Debt
7.50% Amortizing Note Due May 15, 2017
May 21, 2014
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 $ 64,959 $ 0   $ 64,959  
Minimum settlement rate     4.4456    
Market value greater or equal to     $ 11.247    
Maximum settlement rate     5.1124    
Market value less than or equal to     $ 9.78    
Tangible equity units settled 435,600        
Issuance of shares of voting common stock 1,936,503        
Tangible equity units outstanding 944,400        
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         $ 50.00