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Losses And Loss Adjustment Expenses (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Extraordinary Item [Line Items]      
Increase in provision for insured events of prior years in 2012 $ 42,332,000 $ 18,494,000 $ (13,058,000)
Increase in provision for insured events   18,000,000  
Decrease in provision for insured events     13,000,000
Unfavorable development     3,000,000
Catastrophe [Member]
      
Extraordinary Item [Line Items]      
Pre-tax catastrophe losses $ 39,000,000 $ 18,000,000 $ 25,000,000