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Debt (Schedule of Long-term Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,214,350 | $ 1,815,253
Subordinated Debentures Due 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds |  | 400,000
Junior Subordinated Debentures Due 2065 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 318,729 | 318,727
Senior Notes Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds |  | 0
Senior Notes Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds |  | 398,141
Senior Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds |  | 399,534
Senior Notes Due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds |  | 298,851
Parent Company [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 2,294,278 | 1,895,253
Parent Company [Member] | Subordinated Debentures Due 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 400,000 | 400,000
Parent Company [Member] | Junior Subordinated Debentures Due 2065 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 398,657 | 398,727
Parent Company [Member] | Senior Notes Due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 398,533 | 0
Parent Company [Member] | Senior Notes Due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 398,362 | 398,141
Parent Company [Member] | Senior Notes Due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 399,602 | 399,534
Parent Company [Member] | Senior Notes Due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 299,124 | $ 298,851

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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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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 + Details
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