SUMMARY OF INVESTMENTS (Investments in Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014 issue	Dec. 31, 2013 issue
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	117	528
Less than 12 months, Fair Value	$ 221,670	$ 922,128
Less than 12 months, Gross Unrealized Depreciation	2,660	48,023
12 months or longer, Number of Issues	195	88
12 months or longer, Fair Value	335,951	110,914
12 months or longer, Gross Unrealized Depreciation	11,268	11,807
Total, Fair Value	557,621	1,033,042
Total, Gross Unrealized Depreciation	13,928	59,830
Fixed Maturities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	105	524
Less than 12 months, Fair Value	220,309	918,634
Less than 12 months, Gross Unrealized Depreciation	2,209	47,906
12 months or longer, Number of Issues	185	71
12 months or longer, Fair Value	334,960	108,961
12 months or longer, Gross Unrealized Depreciation	11,160	11,477
Total, Fair Value	555,269	1,027,595
Total, Gross Unrealized Depreciation	13,369	59,383
U.S. Treasury [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	4	10
Less than 12 months, Fair Value	2,343	9,196
Less than 12 months, Gross Unrealized Depreciation	6	140
12 months or longer, Number of Issues	4	0
12 months or longer, Fair Value	5,069	0
12 months or longer, Gross Unrealized Depreciation	46	0
Total, Fair Value	7,412	9,196
Total, Gross Unrealized Depreciation	52	140
U.S. Government Agency [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	11	101
Less than 12 months, Fair Value	41,064	256,203
Less than 12 months, Gross Unrealized Depreciation	70	18,019
12 months or longer, Number of Issues	35	2
12 months or longer, Fair Value	95,198	4,356
12 months or longer, Gross Unrealized Depreciation	2,352	644
Total, Fair Value	136,262	260,559
Total, Gross Unrealized Depreciation	2,422	18,663
States, Municipalities and Political Subdivisions [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	18	136
Less than 12 months, Fair Value	30,859	97,950
Less than 12 months, Gross Unrealized Depreciation	185	7,423
12 months or longer, Number of Issues	62	29
12 months or longer, Fair Value	50,847	29,670
12 months or longer, Gross Unrealized Depreciation	557	3,282
Total, Fair Value	81,706	127,620
Total, Gross Unrealized Depreciation	742	10,705
Foreign Bonds [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	6	10
Less than 12 months, Fair Value	17,158	20,832
Less than 12 months, Gross Unrealized Depreciation	446	397
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	17,158	20,832
Total, Gross Unrealized Depreciation	446	397
Public Utilities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	10	31
Less than 12 months, Fair Value	21,839	61,582
Less than 12 months, Gross Unrealized Depreciation	194	1,776
12 months or longer, Number of Issues	4	0
12 months or longer, Fair Value	3,611	0
12 months or longer, Gross Unrealized Depreciation	294	0
Total, Fair Value	25,450	61,582
Total, Gross Unrealized Depreciation	488	1,776
Corporate Bonds [Member] | Energy [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	8	9
Less than 12 months, Fair Value	17,416	23,735
Less than 12 months, Gross Unrealized Depreciation	420	1,008
12 months or longer, Number of Issues	3	0
12 months or longer, Fair Value	7,061	0
12 months or longer, Gross Unrealized Depreciation	373	0
Total, Fair Value	24,477	23,735
Total, Gross Unrealized Depreciation	793	1,008
Corporate Bonds [Member] | Industrials [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	8	34
Less than 12 months, Fair Value	17,103	77,788
Less than 12 months, Gross Unrealized Depreciation	362	2,819
12 months or longer, Number of Issues	3	0
12 months or longer, Fair Value	9,592	0
12 months or longer, Gross Unrealized Depreciation	1,792	0
Total, Fair Value	26,695	77,788
Total, Gross Unrealized Depreciation	2,154	2,819
Corporate Bonds [Member] | Consumer Goods and Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	11	31
Less than 12 months, Fair Value	28,344	58,833
Less than 12 months, Gross Unrealized Depreciation	258	1,276
12 months or longer, Number of Issues	7	6
12 months or longer, Fair Value	10,064	3,218
12 months or longer, Gross Unrealized Depreciation	66	145
Total, Fair Value	38,408	62,051
Total, Gross Unrealized Depreciation	324	1,421
Corporate Bonds [Member] | Health Care [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	3	10
Less than 12 months, Fair Value	8,244	25,888
Less than 12 months, Gross Unrealized Depreciation	36	942
12 months or longer, Number of Issues	3	2
12 months or longer, Fair Value	7,104	4,427
12 months or longer, Gross Unrealized Depreciation	174	258
Total, Fair Value	15,348	30,315
Total, Gross Unrealized Depreciation	210	1,200
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	4	18
Less than 12 months, Fair Value	8,860	58,105
Less than 12 months, Gross Unrealized Depreciation	68	2,147
12 months or longer, Number of Issues	4	2
12 months or longer, Fair Value	15,742	7,468
12 months or longer, Gross Unrealized Depreciation	731	1,174
Total, Fair Value	24,602	65,573
Total, Gross Unrealized Depreciation	799	3,321
Corporate Bonds [Member] | Financial Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	3	7
Less than 12 months, Fair Value	5,908	15,191
Less than 12 months, Gross Unrealized Depreciation	31	720
12 months or longer, Number of Issues	2	1
12 months or longer, Fair Value	6,131	1,525
12 months or longer, Gross Unrealized Depreciation	56	3
Total, Fair Value	12,039	16,716
Total, Gross Unrealized Depreciation	87	723
Mortgage Backed Securities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	9	16
Less than 12 months, Fair Value	425	4,476
Less than 12 months, Gross Unrealized Depreciation	21	177
12 months or longer, Number of Issues	2	6
12 months or longer, Fair Value	1,991	3,113
12 months or longer, Gross Unrealized Depreciation	25	114
Total, Fair Value	2,416	7,589
Total, Gross Unrealized Depreciation	46	291
Collateralized Mortgage Obligations [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	10	111
Less than 12 months, Fair Value	20,746	208,855
Less than 12 months, Gross Unrealized Depreciation	112	11,062
12 months or longer, Number of Issues	56	23
12 months or longer, Fair Value	122,550	55,184
12 months or longer, Gross Unrealized Depreciation	4,694	5,857
Total, Fair Value	143,296	264,039
Total, Gross Unrealized Depreciation	4,806	16,919
Equity Securities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	12	4
Less than 12 months, Fair Value	1,361	3,494
Less than 12 months, Gross Unrealized Depreciation	451	117
12 months or longer, Number of Issues	10	17
12 months or longer, Fair Value	991	1,953
12 months or longer, Gross Unrealized Depreciation	108	330
Total, Fair Value	2,352	5,447
Total, Gross Unrealized Depreciation	559	447
Common Stock [Member] | Public Utilities [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	3	0
Less than 12 months, Fair Value	263	0
Less than 12 months, Gross Unrealized Depreciation	44	0
12 months or longer, Number of Issues	0	3
12 months or longer, Fair Value	0	281
12 months or longer, Gross Unrealized Depreciation	0	27
Total, Fair Value	263	281
Total, Gross Unrealized Depreciation	44	27
Common Stock [Member] | Industrials [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	3	1
Less than 12 months, Fair Value	280	1
Less than 12 months, Gross Unrealized Depreciation	70	1
12 months or longer, Number of Issues	2	2
12 months or longer, Fair Value	58	81
12 months or longer, Gross Unrealized Depreciation	54	31
Total, Fair Value	338	82
Total, Gross Unrealized Depreciation	124	32
Common Stock [Member] | Consumer Goods and Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	1
Less than 12 months, Fair Value	129
Less than 12 months, Gross Unrealized Depreciation	272
12 months or longer, Number of Issues	2
12 months or longer, Fair Value	15
12 months or longer, Gross Unrealized Depreciation	3
Total, Fair Value	144
Total, Gross Unrealized Depreciation	275
Common Stock [Member] | Technology, Media and Telecommunications [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	4	0
Less than 12 months, Fair Value	503	0
Less than 12 months, Gross Unrealized Depreciation	14	0
12 months or longer, Number of Issues	5	6
12 months or longer, Fair Value	218	206
12 months or longer, Gross Unrealized Depreciation	44	83
Total, Fair Value	721	206
Total, Gross Unrealized Depreciation	58	83
Common Stock [Member] | Financial Services [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	1	0
Less than 12 months, Fair Value	186	0
Less than 12 months, Gross Unrealized Depreciation	51	0
12 months or longer, Number of Issues	0	4
12 months or longer, Fair Value	0	215
12 months or longer, Gross Unrealized Depreciation	0	128
Total, Fair Value	186	215
Total, Gross Unrealized Depreciation	51	128
Nonredeemable Preferred Stocks [Member]
AVAILABLE-FOR-SALE
Less than 12 months, Number of Issues	0	3
Less than 12 months, Fair Value	0	3,493
Less than 12 months, Gross Unrealized Depreciation	0	116
12 months or longer, Number of Issues	1	2
12 months or longer, Fair Value	700	1,170
12 months or longer, Gross Unrealized Depreciation	7	61
Total, Fair Value	700	4,663
Total, Gross Unrealized Depreciation	$ 7	$ 177