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VARIABLE INTEREST ENTITY - (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 27, 2017
Variable Interest Entity [Line Items]        
Cash flows from operating activities $ 13,106 $ 69,750 $ 52,891  
Monarch Delaware Holdings LLC [Member]        
Variable Interest Entity [Line Items]        
Ownership percentage       42.40%
Earned premiums 9,400 12,500 4,700  
Operating loss 2,900 600 300  
Cash flows from operating activities 3,800 $ 6,800 $ 4,700  
Transatlantic Reinsurance Company [Member] | Monarch Delaware Holdings LLC [Member]        
Variable Interest Entity [Line Items]        
Ownership percentage       15.20%
Capital contribution for non-voting interests $ 5,000      
MNIC [Member] | MNIC [Member]        
Variable Interest Entity [Line Items]        
Noncontrolling ownership interest, percent 100.00%      
MNIC [Member] | Monarch Delaware Holdings LLC [Member]        
Variable Interest Entity [Line Items]        
Noncontrolling ownership interest, percent 100.00%