Summary Of Investments Other Than Investments In Related Parties (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	$ 3,062,861	$ 3,041,469
Fair value	3,158,312	3,180,095
Amounts in the balance sheet	3,158,312	3,180,095
Fixed Maturity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	2,523,042	2,270,903
Fair value	2,560,653	2,408,354
Amounts in the balance sheet	2,560,653	2,408,354
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	15,994	13,999
Fair value	16,096	14,204
Amounts in the balance sheet	16,096	14,204
Fixed Maturity Securities [Member] | Municipal Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	2,201,047	2,040,537
Fair value	2,235,323	2,165,095
Amounts in the balance sheet	2,235,323	2,165,095
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	37,848	27,786
Fair value	40,247	30,703
Amounts in the balance sheet	40,247	30,703
Fixed Maturity Securities [Member] | Corporate Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	264,172	151,019
Fair value	264,685	155,551
Amounts in the balance sheet	264,685	155,551
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	3,981	37,562
Fair value	4,302	42,801
Amounts in the balance sheet	4,302	42,801
Equity Securities [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	223,933	475,959
Fair value	281,883	477,088
Amounts in the balance sheet	281,883	477,088
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	29,740	10,895
Fair value	29,567	11,701
Amounts in the balance sheet	29,567	11,701
Equity Securities [Member] | Partnership Interest in a Private Credit Fund [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	10,000	10,000
Fair value	12,548	11,306
Amounts in the balance sheet	12,548	11,306
Equity Securities [Member] | Public Utilities [Member] | Common Stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	81,128	82,474
Fair value	85,287	85,106
Amounts in the balance sheet	85,287	85,106
Equity Securities [Member] | Banks, Trust, And Insurance Companies [Member] | Common Stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	1,610	19,701
Fair value	2,927	22,166
Amounts in the balance sheet	2,927	22,166
Equity Securities [Member] | Energy and Other [Member] | Common Stock [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	101,455	352,889
Fair value	151,554	346,809
Amounts in the balance sheet	151,554	346,809
Short-Term Investments [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Cost	315,886	294,607
Fair value	315,776	294,653
Amounts in the balance sheet	$ 315,776	$ 294,653