INVESTMENTS (DETAILS 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Investment Income [Line Items]
Gross investment income	$ 122,745	$ 91,147	$ 215,824	$ 207,474
Investment expenses	(7,878)	(8,035)	(18,214)	(15,455)
Net investment income	114,867	83,112	197,610	192,019
Fixed Maturities [Member]
Net Investment Income [Line Items]
Gross investment income	78,523	74,503	151,480	144,185
Other Investments [Member]
Net Investment Income [Line Items]
Gross investment income	32,492	11,848	49,252	55,279
Equity Securities [Member]
Net Investment Income [Line Items]
Gross investment income	5,301	3,134	7,587	4,548
Cash And Cash Equivalents [Member]
Net Investment Income [Line Items]
Gross investment income	6,183	1,265	7,046	2,533
Short-term Investments [Member]
Net Investment Income [Line Items]
Gross investment income	$ 246	$ 397	$ 459	$ 929