INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net investment income
Gross investment income									$ 57,758	$ 63,509	$ 68,298
Less investment expenses									(4,995)	(4,678)	(4,617)
Net investment income	13,432	13,598	12,847	12,886	14,491	14,221	14,826	15,293	52,763	58,831	63,681
Fixed income securities
Net investment income
Gross investment income									45,870	50,646	58,294
Equity securities
Net investment income
Gross investment income									11,865	12,848	9,957
Cash and Short-term Investments
Net investment income
Gross investment income									$ 23	$ 15	$ 47