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Commitments And Contingencies (Schedule Of Future Minimum Lease Payments for Capital Leases and Operating Leases) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments And Contingencies [Abstract]  
2018, Capital Leases $ 1,034
2019, Capital Leases 1,061
2020, Capital Leases 874
2021, Capital Leases 838
2022, Capital Leases 781
Thereafter, Capital Leases 6,243
Total minimum capital lease payments 10,831
Less amount representing interest 3,415
Present value of net minimum lease payments 7,416
Less current maturities 580
Capital lease obligations, less current maturities 6,836
2018, Operating Leases 5,927
2019, Operating Leases 6,231
2020, Operating Leases 5,098
2021, Operating Leases 4,249
2022, Operating Leases 2,038
Thereafter, Operating Leases 5,301
Total minimum operating lease payments 28,844
2018, Sublease Income 512
2019, Sublease Income 525
2020, Sublease Income 538
2021, Sublease Income 552
Total minimum sublease income $ 2,127