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Debt (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2006
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  | $ 18,651,000 | $ 20,405,000 |  |
Undrawn Outstanding Letters Of Credit In Favor Of Third Parties |  | 105,600,000 | 120,100,000 |  |
Undrawn Outstanding Letters Of Credit Between Subsidiaries |  | 1,356,900,000 | 1,492,200,000 |  |
Debt Instrument, Face Amount |  |  |  |  | $ 850,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,260,300,000.0 |  |  |
Debt, Weighted Average Interest Rate |  | 5.24% |  |  |
Long-term Debt, Gross |  | $ 2,806,524,000 | 2,808,770,000 |  |
Long-term debt |  | 2,787,873,000 | 2,788,365,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  | 3,167,000 |  |  |
Line of Credit Facility, Commitment Fee Amount |  | $ 9,700,000 | 10,500,000 | $ 7,900,000 |
Senior Notes Due 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.95% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2026 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 399,988,000 | 399,987,000 |  |
Subordinated Debentures Due 2056 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.75% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2056 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 400,000,000 | 400,000,000 |  |
Junior Subordinated Debentures Due 2065 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.82% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2065 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 318,743,000 | 318,740,000 |  |
Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2021 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 399,466,000 | 399,245,000 |  |
Subordinated Debentures Due 2042 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.20% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2042 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 400,000,000 | 400,000,000 |  |
Senior Notes Due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.70% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2023 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 399,288,000 | 399,138,000 |  |
Notes Payable to Banks [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.09% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2039 |  |  |
Debt Instrument, Face Amount |  | $ 100,000,000 |  |  |
Long-term Debt, Gross |  | $ 89,098,000 | 91,787,000 |  |
Senior Notes Due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.45% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2019 |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |
Long-term Debt, Gross |  | $ 399,941,000 | 399,873,000 |  |
Senior Notes Due 2017 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.625% |  |  |
Debt Instrument, Maturity Date |  | Dec. 31, 2017 |  |  |
Debt Instrument, Face Amount |  | $ 300,000,000 |  |  |
Syndicated Credit Facility $850 Million [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 850,000,000 |  |  |
Long-term Line of Credit | [1] | $ 18,153,000 | $ 95,564,000 |  |
[1] | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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