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Property and Casualty Unpaid Claims and Claim Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Claims and claim expense payments for claims occurring during:      
Plus reinsurance recoverables $ 24,049 $ 21,185  
Property and casualty segment [Member]
      
Reconciliation of property and casualty unpaid claims and claim expenses      
Gross reserves, beginning of year 281,080 301,622 300,975
Less reinsurance recoverables 11,463 12,225 15,769
Net reserves, beginning of year 269,617 289,397 285,206
Incurred claims and claim expenses:      
Claims occurring in the current year 406,605 452,827 438,784
Decrease in estimated reserves for claims occurring in prior years (17,175) (10,310) (20,530)
Total claims and claim expenses incurred 389,430 442,517 418,254
Claims and claim expense payments for claims occurring during:      
Current year 271,286 314,759 281,270
Prior years 126,924 147,539 132,793
Total claims and claim expense payments 398,210 462,298 414,063
Net reserves, end of year 260,837 269,617 289,397
Plus reinsurance recoverables 13,705 11,463 12,225
Gross reserves, end of year $ 274,542 $ 281,080 $ 301,622