Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue		$ (175,619)	$ (149,612)
Customer deposits		(39,101)	(27,963)
Deferred revenue and customer deposits	$ (214,720)	(214,720)	(177,575)
Change in Contract with Customer, Liability [Abstract]
Deferred revenue on January 1, 2019	177,575
Additions	(709,843)
Revenue recognized	(683,836)
Deferred revenue on December 31, 2019	214,720
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue			(141,458)
Customer deposits			(13,482)
Deferred revenue and customer deposits	(154,940)		$ (154,940)
Change in Contract with Customer, Liability [Abstract]
Deferred revenue on January 1, 2019	154,940
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue		(8,154)
Customer deposits		(14,481)
Deferred revenue and customer deposits	(22,635)	$ (22,635)
Change in Contract with Customer, Liability [Abstract]
Deferred revenue on December 31, 2019	$ 22,635