Leases (Future Minimum Lease Payments For Capital And Operating Leases) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Capital Leased Assets [Line Items]
Capital Leases, 2018	$ 955
Capital Leases, 2019	876
Capital Leases, 2020	876
Capital Leases, 2021	876
Capital Leases, 2022	863
Capital Leases, Thereafter	437
Capital Leases, Total minimum lease payments	4,883
Less amount representing interest, 3.60% weighted-average interest rate	(480)
Present value of obligations under capital leases	4,403
Less current portion	(834)
Long-term capital lease obligations	3,569
Operating Leases, 2018	193,439
Operating Leases, 2019	173,953
Operating Leases, 2020	163,038
Operating Leases, 2021	124,357
Operating Leases, 2022	96,047
Operating Leases, Thereafter	388,150
Operating Leases, Total minimum lease payments	$ 1,138,984
Capital Lease Obligations [Member]
Capital Leased Assets [Line Items]
Weighted average interest rate	3.60%