Other Current and Long-Term Assets (Schedule of Other Noncurrent Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets, Noncurrent [Abstract]
Customer acquisition costs	$ 104,369	$ 98,117
Contract assets, net	91,681	66,226
Deferred income taxes	31,549	8,100
Investment in long-term product supply arrangements	12,065	13,657
Deferred sales commissions	11,719	10,442
Taxes receivable	6,329	14,960
Other	31,883	28,690
Other long-term assets	$ 289,595	$ 240,192