Commitments And Contingencies (Annual Minimum Lease Payments) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments And Contingencies [Abstract]
Capital Leases, due on 2017	$ 1,500
Capital Leases, due on 2018	1,149
Capital Leases, due on 2019	572
Capital Leases, due on 2020	169
Total minimum lease payments	3,390
Less: amount representing interest	(172)
Present value of future payments	3,218
Less: current obligations	(1,715)
Long-term obligations	1,503
Operating Leases, due on 2017	195,954
Operating Leases, due on 2018	199,780
Operating Leases, due on 2019	201,863
Operating Leases, due on 2020	203,323
Operating Leases, due on 2021	$ 205,767