Other Current and Long-Term Assets (Schedule Of Other Long-term Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Assets, Noncurrent [Abstract]
Contract assets, net	$ 131,006	$ 122,160
Customer acquisition costs	108,367	109,392
Deferred income taxes	23,091	24,784
Deferred sales commissions	12,884	13,019
Investment in long-term product supply arrangements	12,014	13,348
Taxes receivable	2,359	1,806
Other assets	45,847	45,891
Other long-term assets	$ 335,568	$ 330,400