Revenues - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract with customer, asset, gross	$ 50,700	$ 34,300
Contract with customer, liability	138,900	136,500
Contract with customer, liability, revenue recognized	(282,322)
Other current assets	146,526	118,085
Unearned revenue	99,556	93,621
Retained earnings (accumulated deficit)	$ (376,390)	$ (425,396)