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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Favorable or adverse loss development $ (25,525) $ (25,601) $ (38,746)
Favorable or unfavorable loss development [Member]
      
Favorable or adverse loss development 25,500 25,500 38,500
Property Development 11,000 7,500 9,000
Casualty Development 14,500 18,000 29,500
Favorable or unfavorable loss development [Member] | General Liability [Member]
      
Favorable or adverse loss development 20,000 (2,500) 11,500
Favorable or unfavorable loss development [Member] | Commercial Automobile [Member]
      
Favorable or adverse loss development 4,500 8,500 13,000
Favorable or unfavorable loss development [Member] | Workers' Compensation [Member]
      
Favorable or adverse loss development (23,500) (2,500) (6,500)
Favorable or unfavorable loss development [Member] | Business Owners' Policies [Member]
      
Favorable or adverse loss development 9,500 9,000 11,000
Favorable or unfavorable loss development [Member] | Commercial Property [Member]
      
Favorable or adverse loss development 7,500 3,500 5,500
Favorable or unfavorable loss development [Member] | Homeowners [Member]
      
Favorable or adverse loss development 2,500 9,000 4,500
Favorable or unfavorable loss development [Member] | Personal Automobile [Member]
      
Favorable or adverse loss development 3,000 (500) (1,000)
Favorable or unfavorable loss development [Member] | Excess And Surplus Operations [Member]
      
Favorable or adverse loss development 2,000 0 0
Favorable or unfavorable loss development [Member] | Remaining Lines Of Business [Member]
      
Favorable or adverse loss development $ 0 $ 1,000 $ 500