Significant Accounting Policies (Schedule Of Exchange Rates To US Dollar) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Canadian Dollar (CAD) [Member]
Currency [Line Items]
Ending rates	1.3642	1.2545
Average Rates	1.2960	1.2981	1.3256
Average Rates % Change	0.20%	2.10%
Euros (EUR) [Member]
Currency [Line Items]
Ending rates	0.8738	0.8334
Average Rates	0.8473	0.8871	0.9041
Average Rates % Change	4.50%	1.90%
Polish Zloty (PLN) [Member]
Currency [Line Items]
Ending rates	3.7606	3.4841
Average Rates	3.6103	3.7764	3.9455
Average Rates % Change	4.40%	4.30%
British Pound (GBP) [Member]
Currency [Line Items]
Ending rates	0.7823	0.7396
Average Rates	0.7497	0.7767	0.7410
Average Rates % Change	3.50%	(4.80%)