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Long-Term Debt And Credit Facility (Schedule Of Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Current portion of long-term debt $ 201,211 $ 3,613
Long-term debt 21,899 22,098
Debt 223,110 25,711
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 200,000  
Aircraft Financing [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 808 3,218
Mortgage [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 403 395
Long-term debt $ 21,899 $ 22,098