POLICY AND CLAIM RESERVES (Property and Casualty Reserve) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Less reinsurance recoverable on unpaid losses	$ 212		$ 366
Net losses:
Estimated claims and claim adjustment expenses for claims arising in prior years	(250)	$ (1,355)
Consolidated Property and Casualty Insurance Entity
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance, beginning of year	7,644	8,897	7,075	$ 7,531
Less reinsurance recoverable on unpaid losses	184	354	327	1,184
Net balances at beginning of year	7,460	8,543	$ 6,748	$ 6,347
Net losses:
Provision for claims and claim adjustment expenses for claims arising in current year	25,460	32,867
Estimated claims and claim adjustment expenses for claims arising in prior years	(250)	(1,355)
Total increases	25,210	31,512
Claims and claim adjustment expense payments for claims arising in:
Current year	20,906	26,275
Prior years	3,592	3,041
Total payments	$ 24,498	$ 29,316