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Schedule - Supplementary Insurance Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred policy acquisition costs $ 214,069 $ 209,627 $ 218,601
Reserve for losses and loss expenses 3,144,924 2,830,058 2,745,799
Unearned premiums 906,991 823,596 844,847
Net premiums earned 1,439,313 1,416,598 1,431,047
Net investment income 149,683 [1] 138,625 [2] 72,501 [3]
Losses and loss expenses incurred 1,074,987 982,118 971,905
Amortization of deferred policy acquisition costs 430,786 [4] 429,524 [5] 428,554 [6]
Other operating expenses 40,458 [4] 27,123 [5] 28,202 [6]
Net premiums written 1,485,349 1,390,541 1,422,655
Policy acquisition costs 469,739 458,045 457,424
Other income (8,479) (9,398) (10,470)
Other expenses 26,425 23,886 26,117
Total 471,244 456,647 456,756
Property and liability insurance [Member]
      
Deferred policy acquisition costs 214,069 209,627 218,601
Reserve for losses and loss expenses 3,144,924 2,830,058 2,745,799
Unearned premiums 906,991 823,596 844,847
Net premiums earned 1,439,313 1,416,598 1,431,047
Net investment income 0 [1] 0 [2] 0 [3]
Losses and loss expenses incurred 1,074,987 982,118 971,905
Amortization of deferred policy acquisition costs 430,786 [4] 429,524 [5] 428,554 [6]
Other operating expenses 40,458 [4] 27,123 [5] 28,202 [6]
Net premiums written 1,485,349 1,390,541 1,422,655
Investments Segment [Member]
      
Deferred policy acquisition costs 0 0 0
Reserve for losses and loss expenses 0 0 0
Unearned premiums 0 0 0
Net premiums earned 0 0 0
Net investment income 149,683 [1] 138,625 [2] 72,501 [3]
Losses and loss expenses incurred 0 0 0
Amortization of deferred policy acquisition costs 0 [4] 0 [5] 0 [6]
Other operating expenses 0 [4] 0 [5] 0 [6]
Net premiums written 0 0 0
Miscellaneous Income [Member]
      
Other income (8,069) [7] (9,230) [8] (10,440) [9]
Other Income [Member]
      
Other income (410) (168) (30)
Miscellaneous Expense [Member]
      
Other expenses 9,574 [7] 7,832 [8] 9,772 [9]
Other Expense [Member]
      
Other expenses $ 16,850 $ 16,054 $ 16,345
[1] 1 Includes "Net investment income earned" and "Net realized investment gains" on the Consolidated Statements of Income.
[2] Includes "Net investment income earned" and "Net realized investment gains" on the Consolidated Statements of Income.
[3] Includes "Net investment income earned" and "Net realized investment gains" on the Consolidated Statements of Income.
[4] 2 The total of "Amortization of deferred policy acquisition costs" of $430,786 and "Other operating expenses" of $40,458 reconciles to the Consolidated Statements of Income as follows: Policy acquisition costs $ 469,739 Other income3 (8,069) Other expenses3 9,574 Total $ 471,244
[5] 2 The total of "Amortization of deferred policy acquisition costs" of $429,524 and "Other operating expenses" of $27,123 reconciles to the Consolidated Statements of Income as follows: Policy acquisition costs $ 458,045 Other income3 (9,230) Other expenses3 7,832 Total $ 456,647
[6] 2 The total of "Amortization of deferred policy acquisition costs" of $428,554 and "Other operating expenses" of $28,202 reconciles to the Consolidated Statements of Income as follows: Policy acquisition costs $ 457,424 Other income3 (10,440) Other expenses3 9,772 Total $ 456,756
[7] In addition to amounts related to the Insurance Operations segment, "Other income" and "Other expenses" on the Consolidated Statements of Income includes holding company income and expense amounts of $410 and $16,850, respectively.
[8] In addition to amounts related to the Insurance Operations segment, "Other income" and "Other expenses" on the Consolidated Statements of Income includes holding company income and expense amounts of $168 and $16,054, respectively.
[9] In addition to amounts related to the Insurance Operations segment, "Other income" and "Other expenses" on the Consolidated Statements of Income includes holding company income and expense amounts of $30 and $16,345, respectively.