Summary of Investments (Fair Value of Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	$ 1,638	$ 1,655
Held-to-Maturity, Fair Value	1,668	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,734,366	2,724,692
Gross Unrealized Appreciation	274,170	265,081
Gross Unrealized Depreciation	5,277	4,568
Available-for-Sale, Fair Value	3,003,259	2,985,205
Debt Securities [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	1,638	1,655
Gross Unrealized Appreciation	30	26
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	1,668	1,681
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,666,902	2,657,800
Gross Unrealized Appreciation	145,514	154,146
Gross Unrealized Depreciation	4,834	3,868
Available-for-Sale, Fair Value	2,807,582	2,808,078
U.S. Treasury [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	36,845	37,887
Gross Unrealized Appreciation	845	939
Gross Unrealized Depreciation	4	5
Available-for-Sale, Fair Value	37,686	38,821
U.S. Government Agency [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	84,527	45,566
Gross Unrealized Appreciation	440	429
Gross Unrealized Depreciation	243	67
Available-for-Sale, Fair Value	84,724	45,928
States, Municipalities and Political Subdivisions [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	1,187	1,185
Gross Unrealized Appreciation	18	11
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	1,205	1,196
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	731,004	739,752
Gross Unrealized Appreciation	52,291	55,572
Gross Unrealized Depreciation	1,662	819
Available-for-Sale, Fair Value	781,633	794,505
Foreign Bonds [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	200,286	207,359
Gross Unrealized Appreciation	11,035	11,863
Gross Unrealized Depreciation	31	62
Available-for-Sale, Fair Value	211,290	219,160
Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	231,379	232,550
Gross Unrealized Appreciation	14,804	15,208
Gross Unrealized Depreciation	7	32
Available-for-Sale, Fair Value	246,176	247,726
Corporate Bonds [Member] \| Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	167,556	169,973
Gross Unrealized Appreciation	8,717	9,758
Gross Unrealized Depreciation	0	0
Available-for-Sale, Fair Value	176,273	179,731
Corporate Bonds [Member] \| Industrial [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	260,157	280,185
Gross Unrealized Appreciation	13,345	13,690
Gross Unrealized Depreciation	101	212
Available-for-Sale, Fair Value	273,401	293,663
Corporate Bonds [Member] \| Consumer Goods and Service [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	190,279	193,313
Gross Unrealized Appreciation	9,015	9,813
Gross Unrealized Depreciation	99	151
Available-for-Sale, Fair Value	199,195	202,975
Corporate Bonds [Member] \| Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	106,528	115,654
Gross Unrealized Appreciation	6,151	7,111
Gross Unrealized Depreciation	133	80
Available-for-Sale, Fair Value	112,546	122,685
Corporate Bonds [Member] \| Technology, Media and Telecommunications [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	122,922	123,660
Gross Unrealized Appreciation	5,792	6,909
Gross Unrealized Depreciation	701	198
Available-for-Sale, Fair Value	128,013	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	252,334	271,061
Gross Unrealized Appreciation	14,759	13,858
Gross Unrealized Depreciation	377	1,059
Available-for-Sale, Fair Value	266,716	283,860
Mortgage Backed Securities [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	242	256
Gross Unrealized Appreciation	12	15
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	254	271
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	24,808	27,940
Gross Unrealized Appreciation	756	888
Gross Unrealized Depreciation	26	21
Available-for-Sale, Fair Value	25,538	28,807
Collateralized Mortgage Obligations [Member]
Held-to-maturity Securities, Debt Maturities [Abstract]
Cost or Amortized Cost	9	14
Gross Unrealized Appreciation	0	0
Gross Unrealized Depreciation	0	0
Held-to-Maturity, Fair Value	9	14
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	253,855	208,042
Gross Unrealized Appreciation	7,130	7,702
Gross Unrealized Depreciation	1,450	1,160
Available-for-Sale, Fair Value	259,535	214,584
Asset-Backed Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	4,044	4,480
Gross Unrealized Appreciation	430	406
Gross Unrealized Depreciation	0	0
Available-for-Sale, Fair Value	4,474	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	67,464	66,892
Gross Unrealized Appreciation	128,656	110,935
Gross Unrealized Depreciation	443	700
Available-for-Sale, Fair Value	195,677	177,127
Common Stocks [Member] \| Public Utilities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,231	7,231
Gross Unrealized Appreciation	9,119	7,268
Gross Unrealized Depreciation	49	83
Available-for-Sale, Fair Value	16,301	14,416
Common Stocks [Member] \| Energy [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	5,094	5,094
Gross Unrealized Appreciation	7,552	6,903
Gross Unrealized Depreciation	0	0
Available-for-Sale, Fair Value	12,646	11,997
Common Stocks [Member] \| Industrial [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	13,015	13,031
Gross Unrealized Appreciation	22,253	19,827
Gross Unrealized Depreciation	124	174
Available-for-Sale, Fair Value	35,144	32,684
Common Stocks [Member] \| Consumer Goods and Service [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	10,394	10,394
Gross Unrealized Appreciation	11,509	8,535
Gross Unrealized Depreciation	42	50
Available-for-Sale, Fair Value	21,861	18,879
Common Stocks [Member] \| Health Care [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	7,920	7,920
Gross Unrealized Appreciation	13,045	10,286
Gross Unrealized Depreciation	25	125
Available-for-Sale, Fair Value	20,940	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	6,255	5,155
Gross Unrealized Depreciation	80	95
Available-for-Sale, Fair Value	12,379	10,427
Common Stocks [Member] \| Financial Services [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	15,681	15,701
Gross Unrealized Appreciation	58,902	52,936
Gross Unrealized Depreciation	103	145
Available-for-Sale, Fair Value	74,480	68,492
Nonredeemable Preferred Stocks [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	1,925	2,154
Gross Unrealized Appreciation	21	25
Gross Unrealized Depreciation	20	28
Available-for-Sale, Fair Value	$ 1,926	$ 2,151

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