Lease Obligations (Schedule Of Future Minimum Lease Payments For Capitalized And Non-Cancelable Operating Leases) (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Lease Obligations [Abstract]
Capitalized Leases, 2016	$ 1,056
Capitalized Leases, 2017	1,083
Capitalized Leases, 2018	1,079
Capitalized Leases, 2019	1,075
Capitalized Leases, 2020	1,013
Capitalized Leases, Later years	8,229
Capitalized Leases, Total minimum lease payments	13,535
Capitalized Leases, Less: amounts representing imputed interest	(4,819)
Capitalized Leases, Present value of minimum lease payments	8,716
Capitalized Leases, Less current portion of capitalized lease obligations	(529)
Capitalized Leases, Capitalized lease obligations, excluding current portion	8,187
Operating Leases, 2016	10,817
Operating Leases, 2017	9,131
Operating Leases, 2018	7,458
Operating Leases, 2019	6,407
Operating Leases, 2020	3,898
Operating Leases, Later years	11,432
Operating Leases, Total minimum lease payments	$ 49,143