Income Taxes (Schedule Of Reconciliation Of Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
U.S. statutory income tax rate	34.00%	34.00%
State and local taxes, net of federal tax benefit	1.00%	1.90%
Permanent differences between book and tax	(15.90%)	5.60%
Deferred tax adjustments	(5.90%)	(9.30%)
State rate adjustments	7.40%	(0.10%)
Valuation allowance	(20.60%)	(32.10%)
Effective income tax rate