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DEBT - Senior Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2013
Senior Notes        
Debt Instrument [Line Items]        
Debt defaults   $ 0    
5.5% Senior Notes        
Debt Instrument [Line Items]        
Senior unsecured notes   $ 295,861,000 $ 295,227,000  
5.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate   5.50% 5.50%  
Debt issuance costs $ 5,100,000      
Events of default, period of payment default   30 days    
Events of default, failure to comply with covenants, period after notice   180 days    
Events of default, failure to comply with other agreements in the indenture, period after notice   30 days    
Events of default, failure to pay final judgments, in excess of 20.0 million   $ 20,000,000    
Declaration of immediate payment, holding percent of principal amount required   25.00%    
7.5% Senior Notes        
Debt Instrument [Line Items]        
Senior unsecured notes   $ 294,909,000 $ 293,980,000  
7.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate   7.50% 7.50%  
Summit Holdings and Finance Corporation | 5.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Senior unsecured notes $ 300,000,000      
Stated interest rate 5.50%      
Maximum percent of aggregate principal amount redeemable   35.00%    
Summit Holdings and Finance Corporation | 7.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Senior unsecured notes       $ 300,000,000
Stated interest rate   7.50%   7.50%
Maximum percent of aggregate principal amount redeemable   35.00%    
Debt issuance costs   $ 7,400,000    
Events of default, period of payment default   30 days    
Events of default, failure to comply with covenants, period after notice   180 days    
Events of default, failure to comply with other agreements in the indenture, period after notice   30 days    
Events of default, failure to pay final judgments, in excess of 20.0 million   $ 20,000,000    
Declaration of immediate payment, holding percent of principal amount required   25.00%    
Debt defaults   $ 0    
Summit Holdings and Finance Corporation | Prior to August 15, 2017 | 5.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   105.50%    
Summit Holdings and Finance Corporation | August 15, 2017 - August 15, 2020 | 5.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   104.125%    
Summit Holdings and Finance Corporation | August 15, 2020 | 5.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   100.00%    
Summit Holdings and Finance Corporation | Prior to July 1, 2016 | 7.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   107.50%    
Summit Holdings and Finance Corporation | July 1, 2016 - June 30, 2019 | 7.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   105.625%    
Summit Holdings and Finance Corporation | July 1, 2019 | 7.5% Senior Notes | Senior Notes        
Debt Instrument [Line Items]        
Redemption price, expressed as percentage of principal amount   100.00%    
Summit Holdings | Finance Corp.        
Debt Instrument [Line Items]        
Cumulative percentage ownership in subsidiary 100.00%