SUMMARY OF INVESTMENTS (Investments in Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 issues	Dec. 31, 2012 issues
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	528	107
Less than 12 months, Fair Value	$ 922,128	$ 182,504
Less than 12 months, Gross Unrealized Depreciation	48,023	2,568
12 months or longer, Number of Issues	88	66
12 months or longer, Fair Value	110,914	37,565
12 months or longer, Gross Unrealized Depreciation	11,807	2,000
Total, Fair Value	1,033,042	220,069
Total, Gross Unrealized Depreciation	59,830	4,568
Fixed Maturities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	524	91
Less than 12 months, Fair Value	918,634	181,198
Less than 12 months, Gross Unrealized Depreciation	47,906	2,386
12 months or longer, Number of Issues	71	34
12 months or longer, Fair Value	108,961	32,783
12 months or longer, Gross Unrealized Depreciation	11,477	1,482
Total, Fair Value	1,027,595	213,981
Total, Gross Unrealized Depreciation	59,383	3,868
U.S. Treasury [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	10	2
Less than 12 months, Fair Value	9,196	1,724
Less than 12 months, Gross Unrealized Depreciation	140	5
12 months or longer, Number of Issues	0	0
12 months or longer, Fair Value	0	0
12 months or longer, Gross Unrealized Depreciation	0	0
Total, Fair Value	9,196	1,724
Total, Gross Unrealized Depreciation	140	5
U.S. Government Agency [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	101	5
Less than 12 months, Fair Value	256,203	17,654
Less than 12 months, Gross Unrealized Depreciation	18,019	67
12 months or longer, Number of Issues	2	0
12 months or longer, Fair Value	4,356	0
12 months or longer, Gross Unrealized Depreciation	644	0
Total, Fair Value	260,559	17,654
Total, Gross Unrealized Depreciation	18,663	67
States, Municipalities and Political Subdivisions [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	136	31
Less than 12 months, Fair Value	97,950	41,775
Less than 12 months, Gross Unrealized Depreciation	7,423	819
12 months or longer, Number of Issues	29	0
12 months or longer, Fair Value	29,670	0
12 months or longer, Gross Unrealized Depreciation	3,282	0
Total, Fair Value	127,620	41,775
Total, Gross Unrealized Depreciation	10,705	819
Foreign Bonds [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	10	1
Less than 12 months, Fair Value	20,832	3,323
Less than 12 months, Gross Unrealized Depreciation	397	48
12 months or longer, Number of Issues	0	1
12 months or longer, Fair Value	0	558
12 months or longer, Gross Unrealized Depreciation	0	14
Total, Fair Value	20,832	3,881
Total, Gross Unrealized Depreciation	397	62
Public Utilities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	31	2
Less than 12 months, Fair Value	61,582	3,155
Less than 12 months, Gross Unrealized Depreciation	1,776	32
12 months or longer, Number of Issues	0	0
12 months or longer, Fair Value	0	0
12 months or longer, Gross Unrealized Depreciation	0	0
Total, Fair Value	61,582	3,155
Total, Gross Unrealized Depreciation	1,776	32
Corporate Bonds [Member] | Energy [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	9
Less than 12 months, Fair Value	23,735
Less than 12 months, Gross Unrealized Depreciation	1,008
12 months or longer, Number of Issues	0
12 months or longer, Fair Value	0
12 months or longer, Gross Unrealized Depreciation	0
Total, Fair Value	23,735
Total, Gross Unrealized Depreciation	1,008
Corporate Bonds [Member] | Industrials [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	34	4
Less than 12 months, Fair Value	77,788	12,194
Less than 12 months, Gross Unrealized Depreciation	2,819	109
12 months or longer, Number of Issues	0	1
12 months or longer, Fair Value	0	2,897
12 months or longer, Gross Unrealized Depreciation	0	103
Total, Fair Value	77,788	15,091
Total, Gross Unrealized Depreciation	2,819	212
Corporate Bonds [Member] | Consumer Goods and Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	31	0
Less than 12 months, Fair Value	58,833	0
Less than 12 months, Gross Unrealized Depreciation	1,276	0
12 months or longer, Number of Issues	6	7
12 months or longer, Fair Value	3,218	4,606
12 months or longer, Gross Unrealized Depreciation	145	151
Total, Fair Value	62,051	4,606
Total, Gross Unrealized Depreciation	1,421	151
Corporate Bonds [Member] | Health Care [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	10	3
Less than 12 months, Fair Value	25,888	7,416
Less than 12 months, Gross Unrealized Depreciation	942	80
12 months or longer, Number of Issues	2	0
12 months or longer, Fair Value	4,427	0
12 months or longer, Gross Unrealized Depreciation	258	0
Total, Fair Value	30,315	7,416
Total, Gross Unrealized Depreciation	1,200	80
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	18	5
Less than 12 months, Fair Value	58,105	13,402
Less than 12 months, Gross Unrealized Depreciation	2,147	198
12 months or longer, Number of Issues	2	0
12 months or longer, Fair Value	7,468	0
12 months or longer, Gross Unrealized Depreciation	1,174	0
Total, Fair Value	65,573	13,402
Total, Gross Unrealized Depreciation	3,321	198
Corporate Bonds [Member] | Financial Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	7	2
Less than 12 months, Fair Value	15,191	1,005
Less than 12 months, Gross Unrealized Depreciation	720	1
12 months or longer, Number of Issues	1	24
12 months or longer, Fair Value	1,525	24,693
12 months or longer, Gross Unrealized Depreciation	3	1,058
Total, Fair Value	16,716	25,698
Total, Gross Unrealized Depreciation	723	1,059
Mortgage Backed Securities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	16	7
Less than 12 months, Fair Value	4,476	4,472
Less than 12 months, Gross Unrealized Depreciation	177	21
12 months or longer, Number of Issues	6	0
12 months or longer, Fair Value	3,113	0
12 months or longer, Gross Unrealized Depreciation	114	0
Total, Fair Value	7,589	4,472
Total, Gross Unrealized Depreciation	291	21
Collateralized Mortgage Obligations [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	111	27
Less than 12 months, Fair Value	208,855	74,702
Less than 12 months, Gross Unrealized Depreciation	11,062	1,004
12 months or longer, Number of Issues	23	1
12 months or longer, Fair Value	55,184	29
12 months or longer, Gross Unrealized Depreciation	5,857	156
Total, Fair Value	264,039	74,731
Total, Gross Unrealized Depreciation	16,919	1,160
Equity Securities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	4	16
Less than 12 months, Fair Value	3,494	1,306
Less than 12 months, Gross Unrealized Depreciation	117	182
12 months or longer, Number of Issues	17	32
12 months or longer, Fair Value	1,953	4,782
12 months or longer, Gross Unrealized Depreciation	330	518
Total, Fair Value	5,447	6,088
Total, Gross Unrealized Depreciation	447	700
Redeemable Preferred Stocks [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues		2
Less than 12 months, Fair Value		376
Less than 12 months, Gross Unrealized Depreciation		2
12 months or longer, Number of Issues		0
12 months or longer, Fair Value		0
12 months or longer, Gross Unrealized Depreciation		0
Total, Fair Value		376
Total, Gross Unrealized Depreciation		2
Common Stock [Member] | Public Utilities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	0	3
Less than 12 months, Fair Value	0	225
Less than 12 months, Gross Unrealized Depreciation	0	83
12 months or longer, Number of Issues	3	0
12 months or longer, Fair Value	281	0
12 months or longer, Gross Unrealized Depreciation	27	0
Total, Fair Value	281	225
Total, Gross Unrealized Depreciation	27	83
Common Stock [Member] | Industrials [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	1	4
Less than 12 months, Fair Value	1	482
Less than 12 months, Gross Unrealized Depreciation	1	52
12 months or longer, Number of Issues	2	9
12 months or longer, Fair Value	81	621
12 months or longer, Gross Unrealized Depreciation	31	122
Total, Fair Value	82	1,103
Total, Gross Unrealized Depreciation	32	174
Common Stock [Member] | Consumer Goods and Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues		2
Less than 12 months, Fair Value		280
Less than 12 months, Gross Unrealized Depreciation		19
12 months or longer, Number of Issues		4
12 months or longer, Fair Value		372
12 months or longer, Gross Unrealized Depreciation		31
Total, Fair Value		652
Total, Gross Unrealized Depreciation		50
Common Stock [Member] | Health Care [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues		1
Less than 12 months, Fair Value		31
Less than 12 months, Gross Unrealized Depreciation		2
12 months or longer, Number of Issues		3
12 months or longer, Fair Value		896
12 months or longer, Gross Unrealized Depreciation		123
Total, Fair Value		927
Total, Gross Unrealized Depreciation		125
Common Stock [Member] | Technology, Media and Telecommunications [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	0	5
Less than 12 months, Fair Value	0	241
Less than 12 months, Gross Unrealized Depreciation	0	7
12 months or longer, Number of Issues	6	7
12 months or longer, Fair Value	206	581
12 months or longer, Gross Unrealized Depreciation	83	88
Total, Fair Value	206	822
Total, Gross Unrealized Depreciation	83	95
Common Stock [Member] | Financial Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	0	1
Less than 12 months, Fair Value	0	47
Less than 12 months, Gross Unrealized Depreciation	0	19
12 months or longer, Number of Issues	4	7
12 months or longer, Fair Value	215	1,109
12 months or longer, Gross Unrealized Depreciation	128	126
Total, Fair Value	215	1,156
Total, Gross Unrealized Depreciation	128	145
Nonredeemable Preferred Stocks [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	3	0
Less than 12 months, Fair Value	3,493	0
Less than 12 months, Gross Unrealized Depreciation	116	0
12 months or longer, Number of Issues	2	2
12 months or longer, Fair Value	1,170	1,203
12 months or longer, Gross Unrealized Depreciation	61	28
Total, Fair Value	4,663	1,203
Total, Gross Unrealized Depreciation	$ 177	$ 28