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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.

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