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Losses And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Unusual or Infrequent Item, or Both [Line Items]    
Prior years claims and claim adjustment expense $ 14,152 $ 61,965
Catastrophe [Member]    
Unusual or Infrequent Item, or Both [Line Items]    
Pre-tax catastrophe losses $ 40,000 $ 19,000