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INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:        
Discounting of net reserves for losses and loss expenses $ 27,804 $ 27,804 $ 47,258  
Unearned premiums 25,188 25,188 41,797  
Operating and capital loss carryforwards 53,095 53,095 43,687  
Accruals not currently deductible 31,560 31,560 59,098  
Other investment adjustments and impairments 0 0 84  
Tax credits 29,929 29,929 10,139  
Other deferred tax assets 15,047 15,047 3,684  
Deferred tax assets before valuation allowance 182,623 182,623 205,747  
Valuation allowance (16,157) (16,157) (41,100) $ (40,331)
Deferred tax assets net of valuation allowance 166,466 166,466 164,647  
Deferred tax liabilities:        
Deferred acquisition costs (24,249) (24,249) (45,788)  
Net unrealized investments gains (8,033) (8,033) (1,168)  
Amortization of VOBA, intangible assets and goodwill (85,296) (85,296) (13,096)  
Equalization reserves (23,274) (23,274) 0  
Other deferred tax liabilities (21,176) (21,176) (1,282)  
Deferred tax liabilities (162,028) (162,028) (61,334)  
Net deferred tax assets 4,438 4,438 $ 103,313 $ 104,762
Deferred tax asset, provisional income tax expense 42,000 41,600    
Deferred tax liabilities, business acquisition $ 103,800 $ 103,800