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Reserve for Losses and Loss Expenses (Roll Forward of Gross and Net Environmental Incurred Losses and Loss Expenses and Related Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reserves for losses and loss expenses at beginning of year, gross $ 47,291 $ 50,474 $ 51,515
Incurred losses and loss expenses, gross 8,257 1,661 5,697
Less: losses and loss expenses paid, gross (9,073) (4,844) (6,738)
Reserves for losses and loss expenses at the end of year, gross 46,475 47,291 50,474
Reserves for losses and loss expenses at beginning of year, net 39,449 41,602 44,093
Incurred losses and loss expenses, net 8,250 2,438 3,475
Less: losses and loss expenses paid, net (9,319) (4,591) (5,966)
Reserves for losses and loss expenses at the end of year, net 38,380 39,449 41,602
Non Asbestos Related Claims [Member]
      
Reserves for losses and loss expenses at beginning of year, gross 37,312 39,418 37,246
Incurred losses and loss expenses, gross 6,243 1,999 8,115
Less: losses and loss expenses paid, gross (5,492) (4,105) (5,943)
Reserves for losses and loss expenses at the end of year, gross 38,063 37,312 39,418
Reserves for losses and loss expenses at beginning of year, net 31,282 32,358 31,124
Incurred losses and loss expenses, net 6,250 2,776 6,405
Less: losses and loss expenses paid, net (5,738) (3,852) (5,171)
Reserves for losses and loss expenses at the end of year, net 31,794 31,282 32,358
Asbestos Related Claims [Member]
      
Reserves for losses and loss expenses at beginning of year, gross 9,979 11,056 14,269
Incurred losses and loss expenses, gross 2,014 (338) (2,418)
Less: losses and loss expenses paid, gross (3,581) (739) (795)
Reserves for losses and loss expenses at the end of year, gross 8,412 9,979 11,056
Reserves for losses and loss expenses at beginning of year, net 8,167 9,244 12,969
Incurred losses and loss expenses, net 2,000 (338) (2,930)
Less: losses and loss expenses paid, net (3,581) (739) (795)
Reserves for losses and loss expenses at the end of year, net $ 6,586 $ 8,167 $ 9,244