SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	$ 150,092	$ 105,300	$ 106,654
Underwriting costs deferred	173,865	156,367	145,301
Amortization of deferred policy acquisition costs	(167,449)	(153,677)	(140,161)
Amortization of value of business acquired	0	0	(1,673)
Ending unamortized deferred policy acquisition costs	156,508	107,990	110,121
Change in shadow deferred policy acquisition costs	(16,789)	42,102	(4,821)
Recorded asset at end of year	139,719	150,092	105,300
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	67,663	64,947	60,668
Underwriting costs deferred	166,508	149,891	138,723
Amortization of deferred policy acquisition costs	(161,310)	(147,175)	(132,771)
Amortization of value of business acquired	0	0	(1,673)
Recorded asset at end of year	72,861	67,663	64,947
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	82,429	40,353	45,986
Underwriting costs deferred	7,357	6,476	6,578
Amortization of deferred policy acquisition costs	(6,139)	(6,502)	(7,390)
Ending unamortized deferred policy acquisition costs	83,647	40,327	45,174
Change in shadow deferred policy acquisition costs	(16,789)	42,102	(4,821)
Recorded asset at end of year	$ 66,858	$ 82,429	$ 40,353