Debt (Schedule Of Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Long-term Debt, By Type [Line Items]
Debt payable, net to 2038	$ 1,706,886	$ 1,996,007
Unsecured notes payable under credit facilities	5,000	0
Debt service guaranty liability	60,900	64,145
Obligations under capital leases	21,898	21,000
Total	$ 1,794,684	$ 2,081,152
Debt Payable To 2038 [Member] \| Minimum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	3.30%	2.60%
Debt Payable To 2038 [Member] \| Maximum [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	7.00%	7.90%
Debt Payable To 2038 [Member] \| Weighted Average [Member]
Schedule of Long-term Debt, By Type [Line Items]
Debt stated interest rate	4.00%	4.00%

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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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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[Line Items] for Schedule of Long-term Debt, By Type

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