Lease Obligations (Schedule Of Future Minimum Lease Payments For Capitalized And Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Lease Obligations [Abstract]
Capitalized Leases, 2017	$ 1,074
Capitalized Leases, 2018	1,071
Capitalized Leases, 2019	1,068
Capitalized Leases, 2020	987
Capitalized Leases, 2021	736
Capitalized Leases, Later years	7,491
Capitalized Leases, Total minimum lease payments	12,427
Capitalized Leases, Less: amounts representing imputed interest	(4,268)
Capitalized Leases, Present value of minimum lease payments	8,159
Capitalized Leases, Less current portion of capitalized lease obligations	(572)
Capitalized Leases, Capitalized lease obligations, excluding current portion	7,587
Operating Leases, 2017	12,686
Operating Leases, 2018	11,674
Operating Leases, 2019	9,663
Operating Leases, 2020	5,915
Operating Leases, 2021	5,364
Operating Leases, Later years	14,749
Operating Leases, Total minimum lease payments	$ 60,051