Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt payable, net to 2038	$ 1,723,073	$ 1,653,154
Unsecured notes payable under credit facilities	40,000
Debt service guaranty liability	53,650	57,380
Finance lease obligation	21,696	21,804
Total	$ 1,838,419	$ 1,732,338
Debt Payable Due Date Two Thousand Thirty Eight [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt stated interest rate	3.30%	3.30%
Debt Payable Due Date Two Thousand Thirty Eight [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt stated interest rate	7.00%	7.00%
Debt Payable Due Date Two Thousand Thirty Eight [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Debt stated interest rate	3.90%	3.90%

Amount of short-term and long-term debt and lease obligation.

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

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Present value of lessee's discounted obligation for lease payments from finance lease.

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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project.

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