Other Current and Long-Term Assets (Schedule of Other Noncurrent Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Investment in long-term product supply arrangements	$ 10,894		$ 9,949
Customer acquisition costs	89,862		64,670
Contract assets	31,269		0
Deferred sales commissions	9,470	$ 11,800	0
Deferred income taxes	8,481		7,698
Other assets	39,617		36,299
Other long-term assets	$ 189,593		$ 118,616