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Commitments And Contingencies (Supplemental Cash Flow Information Related To Operating Leases) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Commitments And Contingencies [Abstract]  
Operating cash flows from operating leases $ 21,459
Right-of-use assets obtained in exchange for lease obligations: Operating leases 11,176
Right-of-use assets and lease obligations derecognized due to lease modifications: Operating leases $ 1,726