INVESTMENTS (Details 5) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Amortized cost of available-for-sale debt securities by contractual maturity
Due in one year or less	$ 12,048,000
Due after one year through five years	150,049,000
Due after five years through 10 years	668,637,000
Due after 10 years	250,127,000
Total amortized cost	1,431,049,000	1,294,350,000
Fair value of available-for-sale debt securities by contractual maturity
Due in one year or less	12,102,000
Due after one year through five years	158,587,000
Due after five years through 10 years	675,290,000
Due after 10 years	243,348,000
Total fair value	1,440,052,000	1,378,582,000
Amortized cost of debt securities held-to-maturity by contractual maturity
Due after one year through five years	651,000
Total amortized cost	651,000	11,728,000
Fair value of debt securities held-to-maturity by contractual maturity
Due after one year through five years	687,000
Total fair value	687,000	11,868,000
Amortized cost of fixed income securities by contractual maturity
Due in one year or less	12,048,000
Due after one year through five years	150,700,000
Due after five years through 10 years	668,637,000
Due after 10 years	250,127,000
Total amortized cost	1,431,700,000
Fair value of fixed income securities by contractual maturity
Due in one year or less	12,102,000
Due after one year through five years	159,274,000
Due after five years through 10 years	675,290,000
Due after 10 years	243,348,000
Total fair value	1,440,739,000
Net unrealized appreciation of available-for-sale fixed maturities and equity securities	208,800,000	219,700,000
Mtge/ABS/CMBS
Amortized cost of available-for-sale debt securities by contractual maturity
Total amortized cost	350,188,000
Fair value of available-for-sale debt securities by contractual maturity
Total fair value	350,725,000
Amortized cost of fixed income securities by contractual maturity
Total amortized cost	350,188,000
Fair value of fixed income securities by contractual maturity
Total fair value	$ 350,725,000