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Fixed Assets (Summary Of Minimum Future Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 89,887
2020 81,899
2021 66,887
2022 59,353
2023 50,916
Thereafter 107,678
Operating leases future minimum payments 456,620
Aircraft [Member]  
Operating Leased Assets [Line Items]  
2019 19,417
2020 15,813
2021 12,877
2022 6,614
2023 3,040
Thereafter 4,565
Operating leases future minimum payments $ 62,326