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Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Other Assets, Noncurrent [Abstract]    
Customer acquisition costs $ 45,260 $ 43,751
Prepaid expenses 34,762 34,556
Contract assets, net 26,601 23,837
Taxes receivable 14,708 19,476
Deferred sales commissions 5,910 5,738
Other assets 12,043 10,150
Other current assets $ 139,284 $ 137,508