Commitments And Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Lease expiration month and year	2020-02
2019	$ 517,000
2020	86,000
2019 - operating leases annual payments subject to cost-of-living adjustments	1,100,000
2020 - operating leases annual payments subject to cost-of-living adjustments	1,000,000
2021 - operating leases annual payments subject to cost-of-living adjustments	1,000,000
2022 - operating leases annual payments subject to cost-of-living adjustments	1,000,000
2023 - operating leases annual payments subject to cost-of-living adjustments	1,000,000
Thereafter - operating leases annual payments subject to cost-of-living adjustments	31,100,000
Rent expense	$ 1,100,000	$ 1,100,000	$ 1,500,000