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STATUTORY INFORMATION AND DIVIDEND RESTRICTIONS (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
company
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Statutory information and dividend restrictions        
Number of insurance companies | company 3      
Remaining unrestricted equity, liquid assets $ 63,100,000      
Equity 806,842,000 $ 853,598,000 $ 823,572,000 $ 823,469,000
Fair Value of Investment in Affiliate Included in Statutory Surplus 132,800,000 106,900,000 104,400,000  
Cost Basis of Investment in Affiliate Included in Statutory Surplus 64,600,000      
Insurance subsidiaries        
Selected information for insurance subsidiaries        
Consolidated net income, statutory basis 135,791,000 72,889,000 128,165,000  
Consolidated surplus, statutory basis 829,775,000 864,554,000 859,976,000  
RLI Ins.        
Statutory information and dividend restrictions        
Authorized control level RBC 170,900,000 157,700,000 127,000,000  
Selected information for insurance subsidiaries        
Consolidated surplus, statutory basis $ 829,800,000 864,600,000 860,000,000  
Dividend restriction as percentage of policyholder surplus 10.00%      
Payments of Ordinary Dividends $ 13,000,000 107,000,000 123,600,000  
Extraordinary dividend paid after seeking and receiving approval from the Illinois regulatory authorities $ 110,000,000 $ 0 $ 0