POLICY ACQUISITION COSTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Policy acquisition costs deferred and amortized to income
Deferred policy acquisition costs (DAC), beginning of year	$ 84,934	$ 77,716	$ 73,147
Deferred:
Direct commissions	185,164	175,697	157,723
Premium taxes	14,395	12,654	11,651
Ceding commissions	(31,140)	(22,190)	(18,096)
Net deferred	168,419	166,161	151,278
Amortized	168,309	158,943	146,709
DAC, end of year	85,044	84,934	77,716
Policy acquisition costs:
Amortized to expense - DAC	168,309	158,943	146,709
Period costs:
Ceding commission - contingent	(3,034)	(2,241)	(3,575)
Other underwriting expenses	123,422	111,036	109,381
Total policy acquisition costs	$ 288,697	$ 267,738	$ 252,515