SUMMARY OF INVESTMENTS (Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Held-To-Maturity
Cost or Amortized Cost	$ 656	$ 1,655
Fair Value	669	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,804,514	2,724,692
Gross Unrealized Appreciation	235,940	265,081
Gross Unrealized Depreciation	59,830	4,568
Fair Value	2,980,624	2,985,205
Fixed Maturities [Member]
Held-To-Maturity
Cost or Amortized Cost	656	1,655
Gross Unrealized Appreciation	13	26
Gross Unrealized Depreciation	0	0
Fair Value	669	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,733,557	2,657,800
Gross Unrealized Appreciation	77,082	154,146
Gross Unrealized Depreciation	59,383	3,868
Fair Value	2,751,256	2,808,078
U.S. Treasury [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	33,612	37,887
Gross Unrealized Appreciation	423	939
Gross Unrealized Depreciation	140	5
Fair Value	33,895	38,821
U.S. Government Agency [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	287,988	45,566
Gross Unrealized Appreciation	258	429
Gross Unrealized Depreciation	18,663	67
Fair Value	269,583	45,928
States, Municipalities and Political Subdivisions [Member]
Held-To-Maturity
Cost or Amortized Cost	250	1,185
Gross Unrealized Appreciation	4	11
Gross Unrealized Depreciation	0	0
Fair Value	254	1,196
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	690,461	739,752
Gross Unrealized Appreciation	34,151	55,572
Gross Unrealized Depreciation	10,705	819
Fair Value	713,907	794,505
Foreign Bonds [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	167,390	207,359
Gross Unrealized Appreciation	5,863	11,863
Gross Unrealized Depreciation	397	62
Fair Value	172,856	219,160
Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	213,479	232,550
Gross Unrealized Appreciation	6,873	15,208
Gross Unrealized Depreciation	1,776	32
Fair Value	218,576	247,726
Corporate Bonds [Member]
Held-To-Maturity
Cost or Amortized Cost		200
Gross Unrealized Appreciation		0
Gross Unrealized Depreciation		0
Fair Value		200
Corporate Bonds [Member] | Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	157,620	169,973
Gross Unrealized Appreciation	4,398	9,758
Gross Unrealized Depreciation	1,008	0
Fair Value	161,010	179,731
Corporate Bonds [Member] | Industrials [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	234,221	280,185
Gross Unrealized Appreciation	5,626	13,690
Gross Unrealized Depreciation	2,819	212
Fair Value	237,028	293,663
Corporate Bonds [Member] | Consumer Goods and Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	165,565	193,313
Gross Unrealized Appreciation	3,770	9,813
Gross Unrealized Depreciation	1,421	151
Fair Value	167,914	202,975
Corporate Bonds [Member] | Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	91,008	115,654
Gross Unrealized Appreciation	3,138	7,111
Gross Unrealized Depreciation	1,200	80
Fair Value	92,946	122,685
Corporate Bonds [Member] | Technology, Media and Telecommunications [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	121,746	123,660
Gross Unrealized Appreciation	2,541	6,909
Gross Unrealized Depreciation	3,321	198
Fair Value	120,966	130,371
Corporate Bonds [Member] | Financial Services [Member]
Held-To-Maturity
Cost or Amortized Cost	200
Gross Unrealized Appreciation	0
Gross Unrealized Depreciation	0
Fair Value	200
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	234,739	271,061
Gross Unrealized Appreciation	7,735	13,858
Gross Unrealized Depreciation	723	1,059
Fair Value	241,751	283,860
Mortgage Backed Securities [Member]
Held-To-Maturity
Cost or Amortized Cost	206	256
Gross Unrealized Appreciation	9	15
Gross Unrealized Depreciation	0	0
Fair Value	215	271
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	22,034	27,940
Gross Unrealized Appreciation	323	888
Gross Unrealized Depreciation	291	21
Fair Value	22,066	28,807
Collateralized Mortgage Obligations [Member]
Held-To-Maturity
Cost or Amortized Cost		14
Gross Unrealized Appreciation		0
Gross Unrealized Depreciation		0
Fair Value		14
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	309,975	208,042
Gross Unrealized Appreciation	1,707	7,702
Gross Unrealized Depreciation	16,919	1,160
Fair Value	294,763	214,584
Asset-Backed Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	3,719	4,480
Gross Unrealized Appreciation	276	406
Gross Unrealized Depreciation	0	0
Fair Value	3,995	4,886
Redeemable Preferred Stocks [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost		378
Gross Unrealized Appreciation		0
Gross Unrealized Depreciation		2
Fair Value		376
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	70,957	66,892
Gross Unrealized Appreciation	158,858	110,935
Gross Unrealized Depreciation	447	700
Fair Value	229,368	177,127
Common Stock [Member] | Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,231	7,231
Gross Unrealized Appreciation	9,068	7,268
Gross Unrealized Depreciation	27	83
Fair Value	16,272	14,416
Common Stock [Member] | Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	5,094	5,094
Gross Unrealized Appreciation	9,269	6,903
Gross Unrealized Depreciation	0	0
Fair Value	14,363	11,997
Common Stock [Member] | Industrials [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	13,308	13,031
Gross Unrealized Appreciation	32,823	19,827
Gross Unrealized Depreciation	32	174
Fair Value	46,099	32,684
Common Stock [Member] | Consumer Goods and Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	10,363	10,394
Gross Unrealized Appreciation	10,895	8,535
Gross Unrealized Depreciation	0	50
Fair Value	21,258	18,879
Common Stock [Member] | Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,920	7,920
Gross Unrealized Appreciation	17,078	10,286
Gross Unrealized Depreciation	0	125
Fair Value	24,998	18,081
Common Stock [Member] | Technology, Media and Telecommunications [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	6,204	5,367
Gross Unrealized Appreciation	7,183	5,155
Gross Unrealized Depreciation	83	95
Fair Value	13,304	10,427
Common Stock [Member] | Financial Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	15,853	15,701
Gross Unrealized Appreciation	72,537	52,936
Gross Unrealized Depreciation	128	145
Fair Value	88,262	68,492
Nonredeemable Preferred Stocks [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	4,984	2,154
Gross Unrealized Appreciation	5	25
Gross Unrealized Depreciation	177	28
Fair Value	$ 4,812	$ 2,151