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Reserve for Losses and Loss Expenses (Reserve Loss Development) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Favorable or adverse loss development $ (38,746) $ (43,589) $ (29,428)
Favorable or adverse loss development [Member]
      
Favorable or adverse loss development (39,000)    
Favorable or adverse loss development [Member] | Remaining Lines Of Business [Member]
      
Favorable or adverse loss development (10,000) (11,000)  
Favorable or adverse loss development [Member] | Workers Compensation [Member]
      
Favorable or adverse loss development     (11,000)
Favorable or adverse loss development [Member] | Accident Years 2005 Through 2007 [Member] | Workers Compensation [Member]
      
Favorable or adverse loss development     (36,000)
Favorable or adverse loss development [Member] | Accident Year 2008 [Member]
      
Favorable or adverse loss development     29,000
Favorable or adverse loss development [Member] | Accident Year 2008 [Member] | Workers Compensation [Member]
      
Favorable or adverse loss development     22,000
Favorable or adverse loss development [Member] | Accident Years 2007 and Prior [Member]
      
Favorable or adverse loss development     (29,000)
Favorable or adverse loss development [Member] | Accident Years 2006 And Prior [Member] | General Liability [Member]
      
Favorable or adverse loss development   (26,000)  
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2009 [Member] | Commercial Automobile [Member]
      
Favorable or adverse loss development   (28,000)  
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member]
      
Favorable or adverse loss development   24,000  
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member] | Homeowners [Member]
      
Favorable or adverse loss development   (6,000)  
Favorable or adverse loss development [Member] | Accident Years 2008 And 2009 [Member] | Workers Compensation [Member]
      
Favorable or adverse loss development   22,000  
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2007 [Member]
      
Favorable or adverse loss development   (44,000)  
Favorable or adverse loss development [Member] | Accident Years 2004 Through 2007 [Member] | General Liability [Member]
      
Favorable or adverse loss development     (8,000)
Favorable or adverse loss development [Member] | Accident Years 2006 2008 And 2009 [Member]
      
Favorable or adverse loss development (60,000)    
Favorable or adverse loss development [Member] | Accident Year 2010 [Member]
      
Favorable or adverse loss development 24,000    
Favorable or adverse loss development [Member] | Accident Years 2007 Through 2009 [Member] | Commercial Automobile [Member]
      
Favorable or adverse loss development (13,000)    
Favorable or adverse loss development [Member] | Accident Years 2009 And Prior [Member] | General Liability [Member]
      
Favorable or adverse loss development (12,000)    
Favorable or adverse loss development [Member] | Accident Years 2008 Through 2010 [Member] | Business Owners Policies [Member]
      
Favorable or adverse loss development (11,000)    
Favorable or adverse loss development [Member] | Accident Year 2010 Partially Offset By Earlier Accident Years [Member] | Workers Compensation [Member]
      
Favorable or adverse loss development 7,000    
Favorable or adverse loss development [Member] | Accident Year 2007 [Member] | Commercial Automobile [Member]
      
Favorable or adverse loss development     $ (10,000)