SCHEDULE I-SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	$ 1,713,249
Fair Value	1,922,094
Amount at which shown in the balance sheet	1,922,058
Fixed maturities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	1,431,700
Fair Value	1,440,739
Amount at which shown in the balance sheet	1,440,703
Fixed maturities | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	1,431,049
Fair Value	1,440,052
Amount at which shown in the balance sheet	1,440,052
Fixed maturities | Held-to-maturity Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	651
Fair Value	687
Amount at which shown in the balance sheet	651
U.S. government | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	17,086
Fair Value	17,303
Amount at which shown in the balance sheet	17,303
U.S. Agency | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	10,513
Fair Value	10,298
Amount at which shown in the balance sheet	10,298
Non U.S. Government & Agency | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	13,306
Fair Value	13,678
Amount at which shown in the balance sheet	13,678
Mtge/ABS/CMBS | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	350,187
Fair Value	350,725
Amount at which shown in the balance sheet	350,725
Corporate | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	511,748
Fair Value	526,038
Amount at which shown in the balance sheet	526,038
Municipal | Available-for-sale Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	528,209
Fair Value	522,010
Amount at which shown in the balance sheet	522,010
Municipal | Held-to-maturity Securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	651
Fair Value	687
Amount at which shown in the balance sheet	651
Equity securities
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	218,848
Fair Value	418,654
Amount at which shown in the balance sheet	418,654
Ind Misc & all other
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	171,211
Fair Value	340,107
Amount at which shown in the balance sheet	340,107
ETFs (Ind/misc)
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	47,637
Fair Value	78,547
Amount at which shown in the balance sheet	78,547
Cash and Short-term Investments
SCHEDULE I - SUMMARY OF INVESTMENTS-OTHER THAN INVESTMENTS IN RELATED PARTIES
Cost	62,701
Fair Value	62,701
Amount at which shown in the balance sheet	$ 62,701