Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 175,619	$ 175,619	$ 135,578	$ 175,619
Customer deposits			66,171	39,101
Deferred revenue and customer deposits			$ 201,749	$ 214,720
Change in Contract with Customer, Liability [Abstract]
Beginning balance	175,619	149,612
Additions	652,960	709,843
Revenue recognized	(693,001)	(683,836)
Ending balance	$ 135,578	$ 175,619