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ORGANIZATION, CONSOLIDATION AND BASIS OF PRESENTATION (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Premiums Written, Net [Member] | Homeowners' Insurance Product Line [Member] | Customer Concentration Risk [Member] | ISA [Member]      
Concentration risk, percentage 24.10% 25.40% 20.50%
Monarch Delaware Holdings LLC [Member]      
Capital contribution for voting interests $ 14.0    
Percentage of ownership interest 42.40%    
Percentage of voting interest held 50.00%    
Transatlantic Reinsurance Company [Member] | Monarch Delaware Holdings LLC [Member]      
Percentage of ownership interest 15.20%    
Capital contribution for non-voting interests $ 5.0    
Transatlantic Reinsurance Company [Member] | Monarch Delaware Holdings LLC [Member] | Senior Debt [Member]      
Long-term debt $ 5.0    
Maturity period of debt 6 years    
Interest rate percentage 6.00%