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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Gross $ 356,110 $ 352,549
Less: accumulated depreciation and amortization (187,111) (177,797)
Total 168,999 174,752
Land, Buildings And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Gross 162,018 163,202
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Gross 143,890 139,137
Corporate Aircraft [Member]    
Property, Plant and Equipment [Line Items]    
Gross 32,249 32,249
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Gross 1,030 1,030
Projects In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Gross $ 16,923 $ 16,931