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Commitments And Contingencies (Components Of Lease Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Commitments And Contingencies [Abstract]        
Operating lease expense $ 5,232 $ 4,944 $ 15,432 $ 15,899
Variable lease expense [1] 530 250 1,429 643
Total lease expense $ 5,762 $ 5,194 $ 16,861 $ 16,542
[1] Represents amounts incurred in excess of the minimum payments required for a certain building lease and for the handling and unloading of railcars for a certain land lease, offset by railcar lease abatements provided by the lessor when railcars are out of service during periods of maintenance or upgrade.