Shareholders' Equity (Schedule Of Issuance And Repurchases Of Common Shares) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shareholders’ Equity [Abstract]
Employee stock-based compensation and exercise of stock options (Note 10), Shares	287,734	277,511	564,583
Employee stock-based compensation and exercise of stock options (Note 10), Amount	$ 33,564	$ 12,525	$ 42,500