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Long-Term Debt and Capital Leases (Schedule Of Long-Term Debt Maturities) (Details) - Future Long Term Debt Maturities Including Long Term Debt To Affiliated Trusts [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 272,500
2019 105,000
2020 52,000
2021 0
2022 250,000
Thereafter 1,090,047
Total $ 1,769,547