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Other Current and Long-Term Assets (Schedule Of Other Current Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Other Assets, Noncurrent [Abstract]    
Customer acquisition costs $ 46,982 $ 43,751
Prepaid expenses 33,227 34,556
Contract assets, net 27,695 23,837
Taxes receivable 17,383 19,476
Deferred sales commissions 6,113 5,738
Other assets 13,992 10,150
Other current assets $ 145,392 $ 137,508