Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Other Assets, Noncurrent [Abstract]
Customer acquisition costs	$ 48,631	$ 48,942
Contract assets, net	41,632	37,772
Prepaid expenses	40,935	41,997
Taxes receivable	21,751	19,464
Deferred sales commissions	6,515	6,475
Other assets	21,817	19,173
Other current assets	$ 181,281	$ 173,823