Commitments And Contingencies Commitments And Contingencies (Summary Of Future Minimum Lease Payments Under Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments and Contingencies [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 14,799
Operating Leases, Future Minimum Payments, Due in Two Years	13,823
Operating Leases, Future Minimum Payments, Due in Three Years	12,025
Operating Leases, Future Minimum Payments, Due in Four Years	8,799
Operating Leases, Future Minimum Payments, Due in Five Years	7,929
Operating Leases, Future Minimum Payments, Due Thereafter	16,845
Operating Leases, Future Minimum Payments Due	$ 74,220