Leases (Schedule Of Base And Contingent Rental Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Base rent expense	$ 32,281	$ 31,630	$ 29,824
Contingent rental expense	1,774	2,505	1,484
Total cinema rent expense	$ 34,055	$ 34,135	$ 31,308