COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	Mar. 31, 2019 USD ($) city	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Outstanding claims receivable	$ 13.4
Reinsurance receivable	106.8
Statutory reserve credit	$ 127.2
Administrative and marketing office space
Loss Contingencies [Line Items]
Number of cities in which properties are leased | city	17
Administrative and marketing office space | Minimum
Loss Contingencies [Line Items]
Operating lease term	1 year
Administrative and marketing office space | Maximum
Loss Contingencies [Line Items]
Operating lease term	10 years
Building contiguous to home office
Loss Contingencies [Line Items]
Approximate purchase price of property		$ 75.0