Summary of Investments (Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	$ 1,477	$ 1,655
Held-to-Maturity, Fair Value	1,449	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,773,629	2,724,692
Gross Unrealized Appreciation	224,246	265,081
Gross Unrealized Depreciation	35,902	4,568
Available-for-Sale, Fair Value	2,961,973	2,985,205
Fixed Maturities [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	1,477	1,655
Gross Unrealized Appreciation	22	26
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	1,499	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,706,174	2,657,800
Gross Unrealized Appreciation	94,138	154,146
Gross Unrealized Depreciation	35,496	3,868
Available-for-Sale, Fair Value	2,764,816	2,808,078
U.S. Treasury [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	35,785	37,887
Gross Unrealized Appreciation	626	939
Gross Unrealized Depreciation	117	5
Available-for-Sale, Fair Value	36,294	38,821
U.S. Government Agency [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	158,029	45,566
Gross Unrealized Appreciation	236	429
Gross Unrealized Depreciation	8,085	67
Available-for-Sale, Fair Value	150,180	45,928
States, Municipalities and Political Subdivisions [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	1,042	1,185
Gross Unrealized Appreciation	11	11
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	1,053	1,196
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	722,826	739,752
Gross Unrealized Appreciation	38,639	55,572
Gross Unrealized Depreciation	9,413	819
Available-for-Sale, Fair Value	752,052	794,505
Foreign Bonds [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	191,145	207,359
Gross Unrealized Appreciation	6,722	11,863
Gross Unrealized Depreciation	234	62
Available-for-Sale, Fair Value	197,633	219,160
Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	228,355	232,550
Gross Unrealized Appreciation	9,623	15,208
Gross Unrealized Depreciation	827	32
Available-for-Sale, Fair Value	237,151	247,726
Corporate Bonds [Member] \| Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	161,682	169,973
Gross Unrealized Appreciation	5,219	9,758
Gross Unrealized Depreciation	820	0
Available-for-Sale, Fair Value	166,081	179,731
Corporate Bonds [Member] \| Industrials [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	246,363	280,185
Gross Unrealized Appreciation	7,269	13,690
Gross Unrealized Depreciation	2,275	212
Available-for-Sale, Fair Value	251,357	293,663
Corporate Bonds [Member] \| Consumer Goods and Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	182,015	193,313
Gross Unrealized Appreciation	5,200	9,813
Gross Unrealized Depreciation	1,036	151
Available-for-Sale, Fair Value	186,179	202,975
Corporate Bonds [Member] \| Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	106,273	115,654
Gross Unrealized Appreciation	3,844	7,111
Gross Unrealized Depreciation	1,128	80
Available-for-Sale, Fair Value	108,989	122,685
Corporate Bonds [Member] \| Technology, Media and Telecommunications [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	130,789	123,660
Gross Unrealized Appreciation	3,249	6,909
Gross Unrealized Depreciation	2,352	198
Available-for-Sale, Fair Value	131,686	130,371
Corporate Bonds [Member] \| Financial Services [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	200	200
Gross Unrealized Appreciation	0	0
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	200	200
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	250,945	271,061
Gross Unrealized Appreciation	9,542	13,858
Gross Unrealized Depreciation	1,032	1,059
Available-for-Sale, Fair Value	259,455	283,860
Mortgage-Backed Securities [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	230	256
Gross Unrealized Appreciation	11	15
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	241	271
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	25,959	27,940
Gross Unrealized Appreciation	496	888
Gross Unrealized Depreciation	148	21
Available-for-Sale, Fair Value	26,307	28,807
Collateralized Mortgage Obligations [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	5	14
Gross Unrealized Appreciation	0	0
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	5	14
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	261,692	208,042
Gross Unrealized Appreciation	3,084	7,702
Gross Unrealized Depreciation	8,029	1,160
Available-for-Sale, Fair Value	256,747	214,584
Asset-Backed Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	3,938	4,480
Gross Unrealized Appreciation	385	406
Gross Unrealized Depreciation	0	0
Available-for-Sale, Fair Value	4,323	4,886
Redeemable Preferred Stocks [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	378	378
Gross Unrealized Appreciation	4	0
Gross Unrealized Depreciation	0	2
Available-for-Sale, Fair Value	382	376
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	67,455	66,892
Gross Unrealized Appreciation	130,108	110,935
Gross Unrealized Depreciation	406	700
Available-for-Sale, Fair Value	197,157	177,127
Common Stocks [Member] \| Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,231	7,231
Gross Unrealized Appreciation	8,673	7,268
Gross Unrealized Depreciation	47	83
Available-for-Sale, Fair Value	15,857	14,416
Common Stocks [Member] \| Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	5,094	5,094
Gross Unrealized Appreciation	7,704	6,903
Gross Unrealized Depreciation	0	0
Available-for-Sale, Fair Value	12,798	11,997
Common Stocks [Member] \| Industrials [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	13,015	13,031
Gross Unrealized Appreciation	23,150	19,827
Gross Unrealized Depreciation	71	174
Available-for-Sale, Fair Value	36,094	32,684
Common Stocks [Member] \| Consumer Goods and Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	10,363	10,394
Gross Unrealized Appreciation	8,860	8,535
Gross Unrealized Depreciation	14	50
Available-for-Sale, Fair Value	19,209	18,879
Common Stocks [Member] \| Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,920	7,920
Gross Unrealized Appreciation	13,238	10,286
Gross Unrealized Depreciation	0	125
Available-for-Sale, Fair Value	21,158	18,081
Common Stocks [Member] \| Technology, Media and Telecommunications [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	6,204	5,367
Gross Unrealized Appreciation	6,554	5,155
Gross Unrealized Depreciation	104	95
Available-for-Sale, Fair Value	12,654	10,427
Common Stocks [Member] \| Financial Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	15,854	15,701
Gross Unrealized Appreciation	61,912	52,936
Gross Unrealized Depreciation	103	145
Available-for-Sale, Fair Value	77,663	68,492
Nonredeemable Preferred Stocks [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	1,774	2,154
Gross Unrealized Appreciation	17	25
Gross Unrealized Depreciation	67	28
Available-for-Sale, Fair Value	$ 1,724	$ 2,151

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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