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Reserve for Losses and Loss Expenses (Roll Forward of Gross and Net Asbestos and Net Environmental Incurred Losses and Loss Expenses and Related Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reserves for losses and loss expenses at beginning of year, gross $ 35,575 $ 36,012 $ 43,609
Incurred losses and loss expenses, gross 347 3,059 (2,271)
Less: losses and loss expenses paid, gross (3,158) (3,496) (5,326)
Reserves for losses and loss expenses at the end of year, gross 32,764 35,575 36,012
Reserves for losses and loss expenses at beginning of year, net 27,769 27,916 35,766
Incurred losses and loss expenses, net 68 3,000 (2,750)
Less: losses and loss expenses paid, net (2,670) (3,147) (5,100)
Reserves for losses and loss expenses at the end of year, net 25,167 27,769 27,916
Asbestos [Member]
      
Reserves for losses and loss expenses at beginning of year, gross 9,170 8,412 9,979
Incurred losses and loss expenses, gross 0 1,696 2,014
Less: losses and loss expenses paid, gross (273) (938) (3,581)
Reserves for losses and loss expenses at the end of year, gross 8,897 9,170 8,412
Reserves for losses and loss expenses at beginning of year, net 7,791 6,586 8,167
Incurred losses and loss expenses, net 0 2,000 2,000
Less: losses and loss expenses paid, net (273) (795) (3,581)
Reserves for losses and loss expenses at the end of year, net 7,518 7,791 6,586
Enviromental [Member]
      
Reserves for losses and loss expenses at beginning of year, gross 26,405 27,600 33,630
Incurred losses and loss expenses, gross 347 1,363 (4,285)
Less: losses and loss expenses paid, gross (2,885) (2,558) (1,745)
Reserves for losses and loss expenses at the end of year, gross 23,867 26,405 27,600
Reserves for losses and loss expenses at beginning of year, net 19,978 21,330 27,599
Incurred losses and loss expenses, net 68 1,000 (4,750)
Less: losses and loss expenses paid, net (2,397) (2,352) (1,519)
Reserves for losses and loss expenses at the end of year, net $ 17,649 $ 19,978 $ 21,330