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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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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.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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