Revenues - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Short-term deferred revenues, net	$ 90,894	$ 81,835
Deferred cost of sales	13,100	11,100
Deferred revenues recognized	80,400
Gross short-term deferred revenue		92,900
Long-term deferred revenues	$ 7,083	$ 10,582