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Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value$ 3,037,561$ 3,159,497
Total liabilities at fair value1,9735,818
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value14,2578,805
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value14,2578,805
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Municipal Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value2,290,3302,435,213
Fixed Maturity Securities [Member] | Municipal Securities [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Municipal Securities [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value2,290,3302,433,589
Fixed Maturity Securities [Member] | Municipal Securities [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value01,624
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value41,17257,367
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value41,17257,367
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Corporate Securities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value77,23195,203
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value77,23195,203
Fixed Maturity Securities [Member] | Corporate Securities [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value43,86755,692
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value43,86755,692
Equity Securities [Member] | Public Utilities [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value24,54927,214
Equity Securities [Member] | Public Utilities [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value24,54927,214
Equity Securities [Member] | Public Utilities [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Public Utilities [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Banks, Trusts And Insurance Companies [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value14,73620,521
Equity Securities [Member] | Banks, Trusts And Insurance Companies [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value14,73620,521
Equity Securities [Member] | Banks, Trusts And Insurance Companies [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Banks, Trusts And Insurance Companies [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Industrial And Other [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value270,991302,103
Equity Securities [Member] | Industrial And Other [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value270,991302,103
Equity Securities [Member] | Industrial And Other [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Industrial And Other [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value11,5719,768
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value11,5719,768
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Short-Term Bonds [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value11,13917,043
Short-Term Bonds [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Short-Term Bonds [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value11,13917,043
Short-Term Bonds [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Money Market Instruments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value237,712126,328
Money Market Instruments [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value237,712126,328
Money Market Instruments [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Money Market Instruments [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value00
Equity Contracts [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value6 
Total liabilities at fair value6252,776
Equity Contracts [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value6 
Total liabilities at fair value6252,776
Equity Contracts [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value0 
Total liabilities at fair value00
Equity Contracts [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value0 
Total liabilities at fair value00
Interest Rate Swap Agreements [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value 4,240
Total liabilities at fair value1,3483,042
Interest Rate Swap Agreements [Member] | Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value 0
Total liabilities at fair value00
Interest Rate Swap Agreements [Member] | Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value 4,240
Total liabilities at fair value1,3483,042
Interest Rate Swap Agreements [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value 0
Total liabilities at fair value00
Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value562,251484,971
Total liabilities at fair value6252,776
Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value2,431,4432,617,210
Total liabilities at fair value1,3483,042
Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets at fair value43,86757,316
Total liabilities at fair value$ 0$ 0