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Leases (Supplemental Cash Flow Information Related To Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating cash flows from operating leases $ 40,339 $ 25,381  
Financing cash flows from finance leases 4,949 1,929 $ 323
Right-of-use assets obtained in exchange for lease obligations: Operating leases 137,679 93,160  
Right-of-use assets obtained in exchange for lease obligations: Finance leases $ 17,177 $ 4,496