Commitments And Contingencies Commitments And Contingencies (Summary Of Future Minimum Lease Payments Under Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Commitments and Contingencies [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 19,267
Operating Leases, Future Minimum Payments, Due in Two Years	16,196
Operating Leases, Future Minimum Payments, Due in Three Years	13,881
Operating Leases, Future Minimum Payments, Due in Four Years	12,654
Operating Leases, Future Minimum Payments, Due in Five Years	10,977
Operating Leases, Future Minimum Payments, Due Thereafter	5,456
Operating Leases, Future Minimum Payments Due	$ 78,431