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Debt and Trust Preferred Securities (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,815,253,000 | $ 1,414,688,000
Junior Subordinated Debentures Due 2065 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 318,727,000 | 318,725,000
Senior Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 399,534,000 | 399,466,000
Senior Notes Due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 298,851,000 | 298,577,000
Senior Notes Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 398,141,000 | 397,920,000
Subordinated Debentures Due 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 400,000,000 | $ 0

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations. + References No definition available. + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 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 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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