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Schedule IV - Supplementary Insurance Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred policy acquisition costs | $ 155,523 |  | $ 135,761 |  | $ 127,984 |
Reserve for losses and loss expenses | 4,068,941 | [1] | 3,144,924 | [2] | 2,830,058 |
Unearned premiums | 974,706 |  | 906,991 |  | 823,596 |
Net premiums earned | 1,584,119 |  | 1,439,313 |  | 1,416,598 |
Net investment income | 140,865 | [3] | 149,683 | [3] | 138,625 | [4]
Losses and loss expenses incurred | 1,120,990 |  | 1,074,987 |  | 982,118 |
Amortization of deferred policy acquisition costs | 298,547 | [5] | 266,061 | [6] | 276,946 | [7]
Other operating expenses | 228,589 | [5] | 201,849 | [6] | 177,508 | [7]
Net premiums written | 1,666,883 |  | 1,485,349 |  | 1,390,541 |
Policy acquisition costs | 526,143 |  | 466,404 |  | 455,852 |
Other income | (9,118) |  | (8,479) |  | (9,398) |
Other expenses | 30,462 |  | 26,425 |  | 23,886 |
Reinsurance Recoverables | 1,421,109 |  | 561,855 |  |  |
Total | 527,136 |  | 467,910 |  | 454,454 |
Total Standard Inurance Operations[Member] |  |  |  |  |  |
Deferred policy acquisition costs | 141,551 |  | 131,043 |  | 127,984 |
Reserve for losses and loss expenses | 3,948,638 | [1] | 3,083,359 | [2] | 2,830,058 |
Unearned premiums | 917,918 |  | 885,850 |  | 823,596 |
Net premiums earned | 1,504,890 |  | 1,435,399 |  | 1,416,598 |
Net investment income | 0 | [3] | 0 | [3] | 0 | [4]
Losses and loss expenses incurred | 1,057,787 |  | 1,071,815 |  | 982,118 |
Amortization of deferred policy acquisition costs | 280,700 | [5] | 265,009 | [6] | 276,946 | [7]
Other operating expenses | 210,852 | [5] | 195,498 | [6] | 177,508 | [7]
Net premiums written | 1,553,586 |  | 1,461,216 |  | 1,390,541 |
Excess And Surplus Operations [Member] |  |  |  |  |  |
Deferred policy acquisition costs | 13,972 |  | 4,718 |  |  |
Reserve for losses and loss expenses | 120,303 | [1] | 61,565 | [2] |  |
Unearned premiums | 56,788 |  | 21,141 |  |  |
Net premiums earned | 79,229 |  | 3,914 |  |  |
Net investment income | 0 | [3] | 0 | [3] |  |
Losses and loss expenses incurred | 63,203 |  | 3,172 |  |  |
Amortization of deferred policy acquisition costs | 17,847 | [5] | 1,052 | [6] |  |
Other operating expenses | 17,737 | [5] | 6,351 | [6] |  |
Net premiums written | 113,297 |  | 24,133 |  |  |
Reinsurance Recoverables | 53,300 |  | 44,000 |  |  |
Investments Segment [Member] |  |  |  |  |  |
Deferred policy acquisition costs | 0 |  | 0 |  | 0 |
Reserve for losses and loss expenses | 0 | [1] | 0 | [2] | 0 |
Unearned premiums | 0 |  | 0 |  | 0 |
Net premiums earned | 0 |  | 0 |  | 0 |
Net investment income | 140,865 | [3] | 149,683 | [3] | 138,625 | [4]
Losses and loss expenses incurred | 0 |  | 0 |  | 0 |
Amortization of deferred policy acquisition costs | 0 | [5] | 0 | [6] | 0 | [7]
Other operating expenses | 0 | [5] | 0 | [6] | 0 | [7]
Net premiums written | 0 |  | 0 |  | 0 |
Miscellaneous Income [Member] |  |  |  |  |  |
Other income | (8,827) | [8] | (8,069) | [9] | (9,230) | [10]
Other Income [Member] |  |  |  |  |  |
Other income | (291) |  | (410) |  | (168) |
Miscellaneous Expense [Member] |  |  |  |  |  |
Other expenses | 9,820 | [8] | 9,575 | [9] | 7,832 | [10]
Other Expense [Member] |  |  |  |  |  |
Other expenses | $ 20,642 |  | $ 16,850 |  | $ 16,054 |
[1] | 1The E&S Insurance Operations Segment amount is presented gross of the reinsurance recoverable of $53.3 million.
[2] | 1The E&S Insurance Operations Segment amount is presented gross of the reinsurance recoverable of $44.0 million.
[3] | 2Includes “Net investment income earned” and “Net realized investment gains” on the Consolidated Statements of Income.
[4] | 1 Includes “Net investment income earned” and “Net realized investment gains” on the Consolidated Statements of Income.
[5] | 3 The total of “Amortization of deferred policy acquisition costs” of $298,547 and “Other operating expenses” of $228,589 reconciles to the Consolidated Statements of Income as follows:
[6] | 3 The total of “Amortization of deferred policy acquisition costs” of $266,061 and “Other operating expenses” of $201,849 reconciles to the Consolidated Statements of Income as follows:
[7] | 2 The total of “Amortization of deferred policy acquisition costs” of $276,946 and “Other operating expenses” of $177,508 reconciles to the Consolidated Statements of Income as follows:
[8] | 4 In addition to amounts related to the Standard and E&S Insurance Operations segments, “Other income” and “Other expenses” on the Consolidated Statements of Income includes holding company income and expense amounts of $291 and $20,642, respectively.
[9] | 4 In addition to amounts related to the Standard and E&S Insurance Operations segments, “Other income” and “Other expenses” on the Consolidated Statements of Income includes holding company income and expense amounts of $410 and $16,850, respectively.
[10] | 3 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.

X
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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 14, 16, 27, 113 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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