Investments Debt And Equity Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Fixed Maturities And Equity Securities [Line Items]
Other-than-temporary Impairment Losses on Fixed Maturities	$ 1,319	$ 70	$ 27
Other-than-temporary Impairment Losses on Other Long-Term Investments	0	561	0
Investments Including Short Term And Cash And Cash Equivalents [Abstract]
Fixed maturity securities	791,528	741,753
Fixed maturity securities percent	82.70%	85.00%
Equity securities	53,741	46,137
Equity securities percent	5.60%	5.30%
Mortgage loans	1,509	1,557
Mortgage loans percent	0.20%	0.20%
Policy loans	42,993	39,090
Policy loans percent	4.50%	4.50%
Real estate and other long-term investments	8,553	8,644
Real estate and other long-term investments percent	0.90%	1.00%
Short-term investments	2,340	2,048
Short-term investments percent	0.20%	0.20%
Cash and cash equivalents	56,299	33,255	49,723	48,625
Cash and cash equivalents percent	5.90%	3.80%
Total cash, cash equivalents and investments	956,963	872,484
Total cash, cash equivalents and investments percent	100.00%	100.00%
Percent of high quality fixed maturity securities	80.40%
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	559,736	484,809
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	559,736	484,809
Available-for-sale Debt Securities, Gross Unrealized Gains, Total	45,873	32,401
Available-for-sale Debt Securities, Gross Unrealized Losses, Total	1,089	2,957
Available-for-sale Debt Securities, Total	604,520	514,253
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	187,008	227,500
Held-to-maturity Securities, Unrecognized Holding Gain	7,109	2,732
Held-to-maturity Securities, Unrecognized Holding Loss	378	139
Held-to-maturity Securities, Debt Maturities, Fair Value	193,739	230,093
Total Fixed maturity securities, Amortized Cost	746,744
Total Fixed Maturity Securities, Fair Value Disclosure	798,259
Available-for-sale equity securities, amortized cost basis	52,744	45,599
Unrealized Continuous Losses on Investments [Abstract]
Debt Securities In Continuous Loss Less Than 12 Months Fair Value	127,739	51,788
Debt Securities Continuous Loss Position Less Than 12 Months Unrealized Losses	1,131	1,138
Number of Debt Securities In Continuous Loss Less Than 12 Months	119	50
Debt Securities In Continuous Loss Position 12 Months Or Longer, Fair Value	5,151	25,569
Debt Securities In Continuous Loss Position 12 Months Or Longer, Unrealized Losses	336	1,958
Number of Debt Securities In Continuous Loss Position 12 Months or Longer	3	20
Debt Securities In Continuous Loss Position, Aggregate Fair Value	132,890	77,357
Debt Securities In Continuous Loss Position, Aggregate Unrealized Losses	1,467	3,096
Number of Debt Securities In Continuous Loss Position, Aggregate	122	70
Schedule of Fixed Maturities [Abstract]
Available-for-sale Securities, Debt Maturities, Due in One Year or Less, Amortized Cost Basis	15,092
Available-for-sale Securities, Debt Maturities, Due in One Year or Less, Fair Value	15,159
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	79,760
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	85,074
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	112,719
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	120,013
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	346,059
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	377,686
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	6,106
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	6,588
Held-to-maturity Securities, Debt Maturities, Due in One Year or Less, Amortized Cost Basis	9,998
Held-to-maturity Securities, Debt Maturities, Due in One Year or Less, Fair Value	10,018
Held-to-maturity Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	35,397
Held-to-maturity Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	35,766
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	47,093
Held-to-maturity Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	50,225
Held-to-maturity Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	94,520
Held-to-maturity Securities, Debt Maturities, Due After Ten Years, Fair Value	97,730
Held-to-maturity Securities, Fair Value	193,739	230,093
Number of investments exceeding stocksholder's equity	0
US Treasury Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	10,170	10,228
Available-for-sale Securities, Gross Unrealized Gains	3,773	3,730
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Fair Value	13,943	13,958
US Government Agencies Debt Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	81,788	143,684
Available-for-sale Securities, Gross Unrealized Gains	3,815	3,198
Available-for-sale Securities, Gross Unrealized Losses	22	65
Available-for-sale Securities, Fair Value	85,581	146,817
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	28,632	160,411
Held-to-maturity Securities, Unrecognized Holding Gain	514	742
Held-to-maturity Securities, Unrecognized Holding Loss	0	12
Held-to-maturity Securities, Debt Maturities, Fair Value	29,146	161,141
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	10,603	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	22	0
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	9	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	3,718
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	65
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	0	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	10,603	3,718
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	22	65
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	9	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		6,997
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		2
Number of Held-to-maturity Securities In Continuous Loss Position Less Than 12 Months		4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,121
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		10
Number of Held-to-maturity Securities In Continuous Loss Position 12 Months or Greater		1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		8,118
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		12
Number of Held-to-maturity Securities In Continuous Loss Position Aggregate		5
US States and Political Subdivisions Debt Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	265,812	151,058
Available-for-sale Securities, Gross Unrealized Gains	17,227	10,275
Available-for-sale Securities, Gross Unrealized Losses	777	1,391
Available-for-sale Securities, Fair Value	282,262	159,942
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	125,634	56,260
Held-to-maturity Securities, Unrecognized Holding Gain	5,435	1,941
Held-to-maturity Securities, Unrecognized Holding Loss	378	84
Held-to-maturity Securities, Debt Maturities, Fair Value	130,691	58,117
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	54,115	1,965
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	443	29
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	61	4
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	5,099	11,777
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	334	1,362
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	2	9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	59,214	13,742
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	777	1,391
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	63	13
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,611	8,345
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	378	84
Number of Held-to-maturity Securities In Continuous Loss Position Less Than 12 Months	32	7
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	0
Number of Held-to-maturity Securities In Continuous Loss Position 12 Months or Greater	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	40,611	8,345
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	378	84
Number of Held-to-maturity Securities In Continuous Loss Position Aggregate	32	7
Foreign Government Debt Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	105	105
Available-for-sale Securities, Gross Unrealized Gains	36	37
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Fair Value	141	142
Corporate Debt Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	195,755	171,462
Available-for-sale Securities, Gross Unrealized Gains	20,536	14,576
Available-for-sale Securities, Gross Unrealized Losses	286	1,493
Available-for-sale Securities, Fair Value	216,005	184,545
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	32,742	10,829
Held-to-maturity Securities, Unrecognized Holding Gain	1,160	49
Held-to-maturity Securities, Unrecognized Holding Loss	0	43
Held-to-maturity Securities, Debt Maturities, Fair Value	33,902	10,835
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	22,316	27,239
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	286	976
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	16	30
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0	8,886
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	517
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	0	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	22,316	36,125
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	286	1,493
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	16	36
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		6,706
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses		43
Number of Held-to-maturity Securities In Continuous Loss Position Less Than 12 Months		4
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		0
Number of Held-to-maturity Securities In Continuous Loss Position 12 Months or Greater		0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value		6,706
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses		43
Number of Held-to-maturity Securities In Continuous Loss Position Aggregate		4
Residential Mortgage Backed Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	5,625	7,536
Available-for-sale Securities, Gross Unrealized Gains	469	562
Available-for-sale Securities, Gross Unrealized Losses	2	8
Available-for-sale Securities, Fair Value	6,092	8,090
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	536
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	4
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	0	1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	52	67
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	2	4
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	1	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	52	603
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2	8
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	1	3
Commercial Mortgage Backed Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Debt Securities, Amortized Cost Basis	481	736
Available-for-sale Securities, Gross Unrealized Gains	17	23
Available-for-sale Securities, Gross Unrealized Losses	2	0
Available-for-sale Securities, Fair Value	496	759
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	94
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	94
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	1
Debt Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Total Fixed maturity securities, Amortized Cost	746,744	712,309
Total Fixed Maturity Securities, Gross Unrealized Gains	52,982	35,133
Total Fixed Maturity Securities, Gross Unrealized Losses	1,467	3,096
Total Fixed Maturity Securities, Fair Value Disclosure	798,259	744,346
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	87,128	29,740
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	753	1,009
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	87	35
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	5,151	24,448
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	336	1,948
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	3	19
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	92,279	54,188
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,089	2,957
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	90	54
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	40,611	22,048
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	378	129
Number of Held-to-maturity Securities In Continuous Loss Position Less Than 12 Months	32	15
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	1,121
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0	10
Number of Held-to-maturity Securities In Continuous Loss Position 12 Months or Greater	0	1
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	40,611	23,169
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	378	139
Number of Held-to-maturity Securities In Continuous Loss Position Aggregate	32	16
Stock Mutual Funds [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	250	415
Available-for-sale Securities, Gross Unrealized Losses	28	376
Available-for-sale Securities, Fair Value	10,685	12,725
Available-for-sale equity securities, amortized cost basis	10,463	12,686
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	0	7,158
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0	376
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	0	2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	972	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	28	0
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	1	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	972	7,158
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	28	376
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	1	2
Bond Mutual Funds [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	541	27
Available-for-sale Securities, Gross Unrealized Losses	129	117
Available-for-sale Securities, Fair Value	41,916	31,414
Available-for-sale equity securities, amortized cost basis	41,504	31,504
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,335	25,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	88	117
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	1	10
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	2,959	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	41	0
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	2	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,294	25,387
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	129	117
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	3	10
Common Stock [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	0	7
Available-for-sale Securities, Gross Unrealized Losses	2	0
Available-for-sale Securities, Fair Value	15	24
Available-for-sale equity securities, amortized cost basis	17	17
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	15
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	2
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	15
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	1
Preferred Stock [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	365	582
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Fair Value	1,125	1,974
Available-for-sale equity securities, amortized cost basis	760	1,392
Equity Securities [Member]
Unrealized Gain (Loss) on Investments [Abstract]
Available-for-sale Securities, Gross Unrealized Gains	1,156	1,031
Available-for-sale Securities, Gross Unrealized Losses	159	493
Available-for-sale Securities, Fair Value	53,741	46,137
Available-for-sale equity securities, amortized cost basis	52,744	45,599
Unrealized Continuous Losses on Investments [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,350	32,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	90	493
Number of Available-for-sale Securities In Continuous Loss Position Less Than 12 Months	2	12
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	3,931	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	69	0
Number of Available-for-sale Securities In Continuous Loss Position For 12 months or Longer	3	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,281	32,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 159	$ 493
Number of Available-for-sale Securities In Continuous Loss Position Aggregate	5	12