Commitments And Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Lease expiration month and year	2020-02
2017	$ 489,000
2018	503,000
2019	517,000
2020	86,000
2017 - operating leases annual payments subject to cost-of-living	500,000
2018 - operating leases annual payments subject to cost-of-living	400,000
2019 - operating leases annual payments subject to cost-of-living	400,000
2020 - operating leases annual payments subject to cost-of-living	400,000
2021 - operating leases annual payments subject to cost-of-living	400,000
Thereafter - operating leases annual payments subject to cost-of-living	13,500,000
Rent expense	$ 1,500,000	$ 1,500,000	$ 1,300,000